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Editor Work2000 Vol. 8, No. 1
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2000, 8(1): 3-6.
Abstract
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It is considered that there are two environmental problems,i.e. pollution and ecological deterioration and environmental geotechnique problems and two types of hanging rivers i.e. permanent and temporary hanging rivers. They become the main engineering geological topics in eastern China in the 21th century. In this paper the basic concept and the research approach to the tpoics are discussed.
It is considered that there are two environmental problems,i.e. pollution and ecological deterioration and environmental geotechnique problems and two types of hanging rivers i.e. permanent and temporary hanging rivers. They become the main engineering geological topics in eastern China in the 21th century. In this paper the basic concept and the research approach to the tpoics are discussed.
2000, 8(1): 7-15.
The problem of high slop stability for permanent shiplock attracts many attention in the world.In this paper the state of slope deformation, deformation tendency after the exploration, characteristics and time effect of the deformation by unloaded zone of rock mass are analysed by using monitoring data and test results.Then deformation stages and amplitudes and the effect of unloaded zone on the slope stability are predicted and assessed.
The problem of high slop stability for permanent shiplock attracts many attention in the world.In this paper the state of slope deformation, deformation tendency after the exploration, characteristics and time effect of the deformation by unloaded zone of rock mass are analysed by using monitoring data and test results.Then deformation stages and amplitudes and the effect of unloaded zone on the slope stability are predicted and assessed.
2000, 8(1): 16-20.
According to the regulaities of regional variation of lateriatization degree of the eluvial soils on granites in South China, a comparison between the chemical compositions and lateritization indexes of ellucial soils on granites in Hong Kong and various areas of South China coastal region permitted the authors to find that the eluvial soils on granite in Hong Kong is characterized by incongruent climate condition at which it occurs either in its thickness and types in its lateritization degree. In this paper a further discussion is made on the causes for undeveloped eluvial soil on granite in Hong Kong and its effect on engineering properties.
According to the regulaities of regional variation of lateriatization degree of the eluvial soils on granites in South China, a comparison between the chemical compositions and lateritization indexes of ellucial soils on granites in Hong Kong and various areas of South China coastal region permitted the authors to find that the eluvial soils on granite in Hong Kong is characterized by incongruent climate condition at which it occurs either in its thickness and types in its lateritization degree. In this paper a further discussion is made on the causes for undeveloped eluvial soil on granite in Hong Kong and its effect on engineering properties.
2000, 8(1): 21-24.
A new concept of engineering geological environmental quality standard(EGEQS) is suggested by the author in the paper,a procedure of development of EGEQS is analysed, and the effect indexes and a mathematical model for EGEQS in Yantai urban area are studied in detail, and then the proposed values of EGEQS in Yantai urban area are also given for the first time in the thessis.
A new concept of engineering geological environmental quality standard(EGEQS) is suggested by the author in the paper,a procedure of development of EGEQS is analysed, and the effect indexes and a mathematical model for EGEQS in Yantai urban area are studied in detail, and then the proposed values of EGEQS in Yantai urban area are also given for the first time in the thessis.
2000, 8(1): 25-30.
According to the practical geological model of slope, by means of the finite element analysis, from the constitutive equations of the elastoplasticity and the viscoelasticity viscoplasticity, the process and mechanism for progressive failure of the locked segment of rockmass are quantitatively revealed and simulated during the rupture, deformation, destruction, and failure of highsteep slope rockmass, and the dynamics driving the motion of rocky landslide with violent starting velocity by high pressure water flow is dealed with.
According to the practical geological model of slope, by means of the finite element analysis, from the constitutive equations of the elastoplasticity and the viscoelasticity viscoplasticity, the process and mechanism for progressive failure of the locked segment of rockmass are quantitatively revealed and simulated during the rupture, deformation, destruction, and failure of highsteep slope rockmass, and the dynamics driving the motion of rocky landslide with violent starting velocity by high pressure water flow is dealed with.
2000, 8(1): 31-34.
On the basis of engineering geological investigation and study on the Luyukou slope in Gujiao city, the major factors affecting the slope stability are defined and the fuzzy mathematics method is used to evaluate the slope stability. The evaluation results are proved to be suitable to the actual stability of the slope.
On the basis of engineering geological investigation and study on the Luyukou slope in Gujiao city, the major factors affecting the slope stability are defined and the fuzzy mathematics method is used to evaluate the slope stability. The evaluation results are proved to be suitable to the actual stability of the slope.
2000, 8(1): 35-39.
Karstic collapse posts existing in North China type coalfields is a special kind of karstic collapse. Based on the special investigation of collapse posts in coalfields of northern China, this paper summarizes their space distribution regularities, gives index system for macroscopic prediction of the collapse posts. By the view point of production, the authors analyze the factors related to water conducting behavior, generalize the method to determine the ground water runoff belt, discuss three types of conduits, and analyze the discrimination of collapse posts and difference between water bursting caused by collapsed posts and that caused by faults.
Karstic collapse posts existing in North China type coalfields is a special kind of karstic collapse. Based on the special investigation of collapse posts in coalfields of northern China, this paper summarizes their space distribution regularities, gives index system for macroscopic prediction of the collapse posts. By the view point of production, the authors analyze the factors related to water conducting behavior, generalize the method to determine the ground water runoff belt, discuss three types of conduits, and analyze the discrimination of collapse posts and difference between water bursting caused by collapsed posts and that caused by faults.
2000, 8(1): 40-45.
In review of the development of marine engineering geology, the types, methods, and contents of the offshore site investigation are described in this paper. Several problems, such as seafloor stability, liquefaction potential of sandy soil, and in situ geotechnical tests, are presented in more details. Finally, the prospects of marine engineering geology in the 21 century are given.
In review of the development of marine engineering geology, the types, methods, and contents of the offshore site investigation are described in this paper. Several problems, such as seafloor stability, liquefaction potential of sandy soil, and in situ geotechnical tests, are presented in more details. Finally, the prospects of marine engineering geology in the 21 century are given.
2000, 8(1): 46-62.
The research development of the soft rock engineering geomechanics in China coal mine is brief discussed in this paper. Firstly, the defects about the definition of soft rock defined by the ISRM are indicated. The new definition and classification of soft rock are brought forward. Based on these, the deformation mechanic of soft rock, the equation of softening state,The determination of loads on the support of the gate,and the design method of soft engineering geomechanics are discussed. It is considerable that the comprehensive system of soft engineering geological mechanism in China coal mine has been formed.
The research development of the soft rock engineering geomechanics in China coal mine is brief discussed in this paper. Firstly, the defects about the definition of soft rock defined by the ISRM are indicated. The new definition and classification of soft rock are brought forward. Based on these, the deformation mechanic of soft rock, the equation of softening state,The determination of loads on the support of the gate,and the design method of soft engineering geomechanics are discussed. It is considerable that the comprehensive system of soft engineering geological mechanism in China coal mine has been formed.
2000, 8(1): 63-67.
Nuclear power is producing electricity for the benefit of society, but it is also leaving radioactive waste behind. It is our responsibility to handle this waste in a safe and proper manner. This paper describes a general concept of deep geological disposal of high level radioactive waste and some problems related to siting of disposal repository. Meanwhile, the paper introduces China a progress in research of deep geological disposal of high level radioactive waste.
Nuclear power is producing electricity for the benefit of society, but it is also leaving radioactive waste behind. It is our responsibility to handle this waste in a safe and proper manner. This paper describes a general concept of deep geological disposal of high level radioactive waste and some problems related to siting of disposal repository. Meanwhile, the paper introduces China a progress in research of deep geological disposal of high level radioactive waste.
2000, 8(1): 68-72.
The engineering Characteristics of rock mass is obviously related to the features of crustal stress field and seepage field. In this paper, a relationship beween the deformation modulus of rock mass and crustal stress, and its spatial variation features are analysised from a great deal of in site data.
The engineering Characteristics of rock mass is obviously related to the features of crustal stress field and seepage field. In this paper, a relationship beween the deformation modulus of rock mass and crustal stress, and its spatial variation features are analysised from a great deal of in site data.
2000, 8(1): 73-80.
The relocation sites of population from the Three Gorges Project site are in a complicate geo-environment in which the land is insufficient to construct.There ecists high risk to utilize the hazardous geomass, such as landslide though it may be stabilized.But this is very realistic subject. The pre stressed anchoring piles aere used to controll large-scale landslides and creat flats to build. The loose filling and sliding mass is reconstructed with cement grout that can greatly decline the price for foundation and slope stabilization. Excavation waste materials can also affect the course of the Yangtze River and the relocation sites by man-made sliding and debris. The fabric retaining wall with height, 57m in maximimum, is build to store the waste material and makes the land suitable to relocation.
The relocation sites of population from the Three Gorges Project site are in a complicate geo-environment in which the land is insufficient to construct.There ecists high risk to utilize the hazardous geomass, such as landslide though it may be stabilized.But this is very realistic subject. The pre stressed anchoring piles aere used to controll large-scale landslides and creat flats to build. The loose filling and sliding mass is reconstructed with cement grout that can greatly decline the price for foundation and slope stabilization. Excavation waste materials can also affect the course of the Yangtze River and the relocation sites by man-made sliding and debris. The fabric retaining wall with height, 57m in maximimum, is build to store the waste material and makes the land suitable to relocation.
2000, 8(1): 81-85.
Two types of connection between newly built and existing highway sections, the direct and the separate connections, have worse influence of additional subsidence on existing highway by overloading after the connection of new built foundation. Isolating wall which is of low cost and convenient to construct is adopted. The role of isolating wall for connection between Xicheng and Huning highways is numerically simulated by using non linear finite element method far soil mass consolidation. Compution and analysis show that isolating wall can effectively reduce the additional subsidence of Huning highway main line centre reduced after its connection with Xicheng highway.
Two types of connection between newly built and existing highway sections, the direct and the separate connections, have worse influence of additional subsidence on existing highway by overloading after the connection of new built foundation. Isolating wall which is of low cost and convenient to construct is adopted. The role of isolating wall for connection between Xicheng and Huning highways is numerically simulated by using non linear finite element method far soil mass consolidation. Compution and analysis show that isolating wall can effectively reduce the additional subsidence of Huning highway main line centre reduced after its connection with Xicheng highway.
2000, 8(1): 86-90.
In this paper, the progressive failure probability of the slope of the Baiyunebo Open Pit Mine is evaluated by using Monte Carlo method, based on 2 D reliability model for progressive slope failure. Then based on the calculation results, the risk of investment and benefit is evaluated by applying economic decision theory to slope engineering.
In this paper, the progressive failure probability of the slope of the Baiyunebo Open Pit Mine is evaluated by using Monte Carlo method, based on 2 D reliability model for progressive slope failure. Then based on the calculation results, the risk of investment and benefit is evaluated by applying economic decision theory to slope engineering.
2000, 8(1): 91-93.
A theoretical analysis is done to study the lateral friction resistance of single pile under compressive and tensile loadings. The effects of soil dilatancy, rotation of the principal stress direction on lateral resistance of pile are quantitatively taken into account, and as a result, the corresponding affecting coefficients formula for predication of lateral resistance are proposed.
A theoretical analysis is done to study the lateral friction resistance of single pile under compressive and tensile loadings. The effects of soil dilatancy, rotation of the principal stress direction on lateral resistance of pile are quantitatively taken into account, and as a result, the corresponding affecting coefficients formula for predication of lateral resistance are proposed.
2000, 8(1): 94-99.
Based on the large amount of data from geology exploration and test and research results, parent rocks of clay intercalation and tectonic force which caused the clay intercalation to formed are studied. Classification, granularity, and distribution of the clay intercalation are also studied. Furthermore, effect of different test methods on shear strength is studied. Then the results of slow shear test on controlled dilated saturated consolidated specimens developed by our institute is analyzed.
Based on the large amount of data from geology exploration and test and research results, parent rocks of clay intercalation and tectonic force which caused the clay intercalation to formed are studied. Classification, granularity, and distribution of the clay intercalation are also studied. Furthermore, effect of different test methods on shear strength is studied. Then the results of slow shear test on controlled dilated saturated consolidated specimens developed by our institute is analyzed.
2000, 8(1): 100-108.
This paper discusses the basic concept of geologic hazards and purposes, tasks, characteristics, technologies, and theoretical analysis and methods for the geo hazards investigation.The author introduces some geo hazards monitoring projects and their application, and states the theoretical system for the geo hazards control engineering and the related technological types. Eventually, some public policies are put forward to reduce the geo hazards.
This paper discusses the basic concept of geologic hazards and purposes, tasks, characteristics, technologies, and theoretical analysis and methods for the geo hazards investigation.The author introduces some geo hazards monitoring projects and their application, and states the theoretical system for the geo hazards control engineering and the related technological types. Eventually, some public policies are put forward to reduce the geo hazards.
2000, 8(1): 109-117.
According to the rock mass structure theory, weak structural face plays a prior control role in rock mass deformation and fracture. It is different in seismic wave propagation characteristics (velocity and attenuation) from surrounding intact rocks, so we can use seismic tomography to determine the spacfial location of weak structural face, and hence to study structural characteristics of rock mass. For study of rock mass structure, we combined the seismic wave travel time tomography and the seismic wave attenuation tomography into an integrated method for detecting weak structural interfaces occuring in rock mass.
According to the rock mass structure theory, weak structural face plays a prior control role in rock mass deformation and fracture. It is different in seismic wave propagation characteristics (velocity and attenuation) from surrounding intact rocks, so we can use seismic tomography to determine the spacfial location of weak structural face, and hence to study structural characteristics of rock mass. For study of rock mass structure, we combined the seismic wave travel time tomography and the seismic wave attenuation tomography into an integrated method for detecting weak structural interfaces occuring in rock mass.
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