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Editor Work1997 Vol. 5, No. 4
Previous Issue
1997, 5(4): 289-291.
Abstract
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In this paper the scientific thinking including geogenesis, geostructure, geoengineering, geoenvironment, and geosystem in the Engineering Geology is discussed for expressing the authors congratulation to professor Sun Guangzhong for his 70 years birthday and his outstanding achievement in the engineering geology.
In this paper the scientific thinking including geogenesis, geostructure, geoengineering, geoenvironment, and geosystem in the Engineering Geology is discussed for expressing the authors congratulation to professor Sun Guangzhong for his 70 years birthday and his outstanding achievement in the engineering geology.
1997, 5(4): 292-294.
The significance, position, and role of rockmass structural mechanics are disdussed from the aspect of rockmass engineering-geological mechanics. Theoretical characteristics of rockmass strucural mechanics are summerized into five aspects, i.e., redeformation and refracture, controling effect of rockmass structure, cybernetics of rockmass structure, its uccurrence environment and mechanical system of multiple mechanical media and construction of mechanical model.
The significance, position, and role of rockmass structural mechanics are disdussed from the aspect of rockmass engineering-geological mechanics. Theoretical characteristics of rockmass strucural mechanics are summerized into five aspects, i.e., redeformation and refracture, controling effect of rockmass structure, cybernetics of rockmass structure, its uccurrence environment and mechanical system of multiple mechanical media and construction of mechanical model.
1997, 5(4): 295-298.
The Sun Guangzhongs basic viewpoints of rockmass strutural mechanics, i.e., viewpoints of rockmass, rockmass structure and its uccurrence viewpoint, effects of rockmass structural mechanics, controling theory of rockmas structure, and three-in-one viewpoint of engineering geology-rockmass mechanics-geological engineering are emphatically discussed in this paper. It is known from the Sun Guangzhongs works that he took a way to study of rockmass mechanicsKeeping a foothold of geology, centering on effects of rockmass structural mechanics and closely connecting with geological engineering.
The Sun Guangzhongs basic viewpoints of rockmass strutural mechanics, i.e., viewpoints of rockmass, rockmass structure and its uccurrence viewpoint, effects of rockmass structural mechanics, controling theory of rockmas structure, and three-in-one viewpoint of engineering geology-rockmass mechanics-geological engineering are emphatically discussed in this paper. It is known from the Sun Guangzhongs works that he took a way to study of rockmass mechanicsKeeping a foothold of geology, centering on effects of rockmass structural mechanics and closely connecting with geological engineering.
1997, 5(4): 299-305.
In order to improve the analogism in geotechnical engineering, it is necessary to further study on its theoretical basis, conditions for its application, analogic property and quantification. We put out the defination and calculation of analogic index by analyzing the influential elements. Some examples show that it is reasonable and applicable.
In order to improve the analogism in geotechnical engineering, it is necessary to further study on its theoretical basis, conditions for its application, analogic property and quantification. We put out the defination and calculation of analogic index by analyzing the influential elements. Some examples show that it is reasonable and applicable.
1997, 5(4): 306-311.
The bending and toppling deformation in slopes of mica quartz schist occurs due to shear displacement slice by slice of schist with concentrated schistosities. The paper gives a theoretical formula of angle between 1and the normal to schistosity plane when the instantaneous deformation is finished. Since then, shear-creep will take place along the schistosities by the shearing stress acting on the plane. The formula of -t is given in the paper. At last, the effect of groundwater pressure on the bending and toppling deformation is also discussed and considered in the theoretical formulas.
The bending and toppling deformation in slopes of mica quartz schist occurs due to shear displacement slice by slice of schist with concentrated schistosities. The paper gives a theoretical formula of angle between 1and the normal to schistosity plane when the instantaneous deformation is finished. Since then, shear-creep will take place along the schistosities by the shearing stress acting on the plane. The formula of -t is given in the paper. At last, the effect of groundwater pressure on the bending and toppling deformation is also discussed and considered in the theoretical formulas.
1997, 5(4): 312-317.
There are some problems in research of the constitutive relation of engineering rock masses in the classic theory of mining subsidence. In this paper, constitutive relation of engineering rockmasses are deeply studied by using the theories combination of engineering geology connected with modern mechanics. It is suggested that the constitutive relation and its parameters of the engineering rockmasses can be well determined with the back analysis of total information by black box greylization. Analysis of an engineering case provides a satisfactory result which also can be obtained by analyzing the problem of mining subsidence of complicated structure.
There are some problems in research of the constitutive relation of engineering rock masses in the classic theory of mining subsidence. In this paper, constitutive relation of engineering rockmasses are deeply studied by using the theories combination of engineering geology connected with modern mechanics. It is suggested that the constitutive relation and its parameters of the engineering rockmasses can be well determined with the back analysis of total information by black box greylization. Analysis of an engineering case provides a satisfactory result which also can be obtained by analyzing the problem of mining subsidence of complicated structure.
1997, 5(4): 318-322.
The mechanical effect of occurrence of discontinuities is an important aspect in determination of strength and deformation behaviors of rockmass. This paper presents the test results on the discontinuities. Factors effecting the deformation of rockmass, including discontinuities and structural mass, are analyzed. The compression shear zone and tension shear zone are formed in the rock mass, and their causative mechanisms are revealed. The mechanical effects of the occurrence of three sets of discontinuities are studied in detail in this paper.
The mechanical effect of occurrence of discontinuities is an important aspect in determination of strength and deformation behaviors of rockmass. This paper presents the test results on the discontinuities. Factors effecting the deformation of rockmass, including discontinuities and structural mass, are analyzed. The compression shear zone and tension shear zone are formed in the rock mass, and their causative mechanisms are revealed. The mechanical effects of the occurrence of three sets of discontinuities are studied in detail in this paper.
1997, 5(4): 323-329.
The ultrabasic rockmass is an important unit in evaluation of slope stability of open pit of Jinchuan Mine since it represents a supporting body for entire slope. In this paper the composition, occurence environement, physico-mechanical properties, and structural characteristics of the rockmass are studyied. From the results a quantitative evaluation of the ultrabasic rockmass is performed.
The ultrabasic rockmass is an important unit in evaluation of slope stability of open pit of Jinchuan Mine since it represents a supporting body for entire slope. In this paper the composition, occurence environement, physico-mechanical properties, and structural characteristics of the rockmass are studyied. From the results a quantitative evaluation of the ultrabasic rockmass is performed.
1997, 5(4): 330-334.
In this paper the discal fracture phenomena of some drill cores in China are described, some principal fracture characteristics of the discal core are summarized. After that an analysis of the fracture mechanism is made for discal fraclure of the rock core. The results show that the fracture spread of rock dics originates from the peripheral microfissure on the core surface. Then,according to the size of the microfissure in rock and the morphologic characteristics of rock discs at Ertan dam site, the maximum principal stress of the ground stress field on Ertan dam site is evaluated quantitatively(the value and the direction of the maxuimum principal stress or the tectonic stress).
In this paper the discal fracture phenomena of some drill cores in China are described, some principal fracture characteristics of the discal core are summarized. After that an analysis of the fracture mechanism is made for discal fraclure of the rock core. The results show that the fracture spread of rock dics originates from the peripheral microfissure on the core surface. Then,according to the size of the microfissure in rock and the morphologic characteristics of rock discs at Ertan dam site, the maximum principal stress of the ground stress field on Ertan dam site is evaluated quantitatively(the value and the direction of the maxuimum principal stress or the tectonic stress).
1997, 5(4): 335-339.
In this paper, the bend failure of the anaclinal slope under effect of applied vertical and horizontal forces is analyzed, some theoretical formulae are developed. Finally, a real example is discussed.
In this paper, the bend failure of the anaclinal slope under effect of applied vertical and horizontal forces is analyzed, some theoretical formulae are developed. Finally, a real example is discussed.
1997, 5(4): 340-345.
The relation between displacement of prototype and that of model if derived for the linear elastic body at its body force condition of self-weight based on the similarity theory.Accodding to the results of discussion of the equation representing the relation and analyse of a pillar body self weight compression, the nonlinear relation between displacement and size is obtained.
The relation between displacement of prototype and that of model if derived for the linear elastic body at its body force condition of self-weight based on the similarity theory.Accodding to the results of discussion of the equation representing the relation and analyse of a pillar body self weight compression, the nonlinear relation between displacement and size is obtained.
1997, 5(4): 346-350.
General slope sliding criteria under a small deformation dondition are proposed in this paper. Meanwhile, the accuracy of different numerical methods and the important features of stress discontinuous line are discussed. The possibility of plastic strain and plastic strain rate for finite deformation considered as slope sliding criteria is studied further. Finally the conspicuous defects in present slope stability theory are pointed out, and the correct direction and its solution methods are suggested.
General slope sliding criteria under a small deformation dondition are proposed in this paper. Meanwhile, the accuracy of different numerical methods and the important features of stress discontinuous line are discussed. The possibility of plastic strain and plastic strain rate for finite deformation considered as slope sliding criteria is studied further. Finally the conspicuous defects in present slope stability theory are pointed out, and the correct direction and its solution methods are suggested.
1997, 5(4): 351-356.
A preliminary idea of geological engineering monitoring information system (GEMIS) is proposed in this paper. Several important problems in the development of the GEMIS are discussed. Four aspects of the developing process: the selection of developing methods, function demand analysis, characteristics of system design, and system developing implementation are concerned. Some understanding of the authors from developing experience are presented.
A preliminary idea of geological engineering monitoring information system (GEMIS) is proposed in this paper. Several important problems in the development of the GEMIS are discussed. Four aspects of the developing process: the selection of developing methods, function demand analysis, characteristics of system design, and system developing implementation are concerned. Some understanding of the authors from developing experience are presented.
1997, 5(4): 357-361.
This paper presentes the development and methods of computer aided geotechnical Engineering (CAGE). CAGE is one part of computer aided Engineering (CAE). It can be used to solve practical geotechnical engineering problems. A geotechnical investigation of the nuclear power station site by using CAGE system is given. Some problems of CAGE application is discussed.
This paper presentes the development and methods of computer aided geotechnical Engineering (CAGE). CAGE is one part of computer aided Engineering (CAE). It can be used to solve practical geotechnical engineering problems. A geotechnical investigation of the nuclear power station site by using CAGE system is given. Some problems of CAGE application is discussed.
1997, 5(4): 362-367.
The concept of artificial geological disaster is proposed and typical examples are enumerated in the paper. The author considers the artificial geological disaster as a kind of geological disaster caused by humans engineering economic activites. Meanwhile, the author also points out that the artificial geological disaster can deteriorate geological environment and the deteriorated geoenvironment can make the geological disaster heavier.
The concept of artificial geological disaster is proposed and typical examples are enumerated in the paper. The author considers the artificial geological disaster as a kind of geological disaster caused by humans engineering economic activites. Meanwhile, the author also points out that the artificial geological disaster can deteriorate geological environment and the deteriorated geoenvironment can make the geological disaster heavier.
1997, 5(4): 368-374.
Some viewpoints of geological hazards control are discussed from geology and engineering design in detail according to the authors experiences and others. The basic problem of geological viewpoint is mechanism analysis of deformation or destruction of geological hazards. The principal target of engineering design is optimum seeking of engineering processing programs for geological hazard control. One right conclusion is drawn that the best effect of geological hazard control is from the combination of geology with engineering design Besides, the relation between prediction, monitoring feedback, effectiveness examination of an engineering construction is studied in this article. Meanwhile, a relation to be a good companion between geological engineer and design engineer is emphasized. Finally, a good example of application about the aforementioned geological hazard control theory to Lianziya dangerous rock body on Three Gorges of Yangtze River in China is described.
Some viewpoints of geological hazards control are discussed from geology and engineering design in detail according to the authors experiences and others. The basic problem of geological viewpoint is mechanism analysis of deformation or destruction of geological hazards. The principal target of engineering design is optimum seeking of engineering processing programs for geological hazard control. One right conclusion is drawn that the best effect of geological hazard control is from the combination of geology with engineering design Besides, the relation between prediction, monitoring feedback, effectiveness examination of an engineering construction is studied in this article. Meanwhile, a relation to be a good companion between geological engineer and design engineer is emphasized. Finally, a good example of application about the aforementioned geological hazard control theory to Lianziya dangerous rock body on Three Gorges of Yangtze River in China is described.
1997, 5(4): 375-380.
The commonly used expressions of results of slope stability evaluation, namely, these criteria for evaluation of slope stability are systematically summarized and analyzed in this paper. These criteria are 1) factor of safety; 2)reliability or probability of failure; 3) values of displacement, stress, velocity of displacement and others for rock mass of slope; 4) conclusions of qualitative experience; 5) disturbence energy; 6) rate of acoustic emission, etc.. On this basis, the main characteristics of all these criteria are analyzed, the suitable conditions application for these criteria and others are also reviewed.
The commonly used expressions of results of slope stability evaluation, namely, these criteria for evaluation of slope stability are systematically summarized and analyzed in this paper. These criteria are 1) factor of safety; 2)reliability or probability of failure; 3) values of displacement, stress, velocity of displacement and others for rock mass of slope; 4) conclusions of qualitative experience; 5) disturbence energy; 6) rate of acoustic emission, etc.. On this basis, the main characteristics of all these criteria are analyzed, the suitable conditions application for these criteria and others are also reviewed.
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