1997 Vol. 5, No. 1

论文
Complex analysis is an effective finite element method to simulate the dynamic response of rock soil mass to earthquake. By using complex modulus to format the stiffness matrix, the damping ratio is irrelevant to the frequency, then the properties of rockmass can be simulated rationally. In this paper, a case about a mountain tunnel along Chuanzhang Highway is used to analysis the characteristics of dynamic response of rock soil mass to earthquake, and the correlation of the tunnel depth with the seismic intensity is also discussed. Complex analysis is an effective finite element method to simulate the dynamic response of rock soil mass to earthquake. By using complex modulus to format the stiffness matrix, the damping ratio is irrelevant to the frequency, then the properties of rockmass can be simulated rationally. In this paper, a case about a mountain tunnel along Chuanzhang Highway is used to analysis the characteristics of dynamic response of rock soil mass to earthquake, and the correlation of the tunnel depth with the seismic intensity is also discussed.
After a description of characteristics of geological environment for waste disposal sites in Pudong new area briefly, using integrated coefficient and hierarchic analysis process, the authors have evaluated geological environment and synthetical suitability of 30 typical waste disposal sites, respectively. After a description of characteristics of geological environment for waste disposal sites in Pudong new area briefly, using integrated coefficient and hierarchic analysis process, the authors have evaluated geological environment and synthetical suitability of 30 typical waste disposal sites, respectively.
In the present paper, physical geological enviroment of Zhoushan sea area is described depth of water, hydrology, coastline, geomorpohlogy, and engineering geological condition, etc. It shows that this harbor area has favourable conditions for building a large scale deep water port. With the development and construction, this harbor area will be of great significance in economy development in east central China. In the present paper, physical geological enviroment of Zhoushan sea area is described depth of water, hydrology, coastline, geomorpohlogy, and engineering geological condition, etc. It shows that this harbor area has favourable conditions for building a large scale deep water port. With the development and construction, this harbor area will be of great significance in economy development in east central China.
The main contents of coral reef engineering geological research include physical geological conditions of coral reef, physical and mechanical characteristics of reef limestone and reef sand soil, and the problems of concrete material of coral debris, ect. In addition to general engineering geological research methods, some methods, such as drilling, static sounding, dynamic sounding, and geological exploration in particular are introduced in this paper. The main contents of coral reef engineering geological research include physical geological conditions of coral reef, physical and mechanical characteristics of reef limestone and reef sand soil, and the problems of concrete material of coral debris, ect. In addition to general engineering geological research methods, some methods, such as drilling, static sounding, dynamic sounding, and geological exploration in particular are introduced in this paper.
Because of the shortcomings in rock mechanics current studies, a new ideathat will confront the challenge in 21 century, intelligent rock mechanics, is proposed in this paper. The main contents of intelligent rock mechanics are also discussed. It integrates various effective analysis methods to explore rock engineering problems systematically. Therefore, accuracy of rock mechanics to solve complicated rock engineering problems will be improved. Because of the shortcomings in rock mechanics current studies, a new ideathat will confront the challenge in 21 century, intelligent rock mechanics, is proposed in this paper. The main contents of intelligent rock mechanics are also discussed. It integrates various effective analysis methods to explore rock engineering problems systematically. Therefore, accuracy of rock mechanics to solve complicated rock engineering problems will be improved.
Based on exprimental and theretical analysis, the authors propose a new failure criterion for uniaxial and triaxial compression tests. The mechanism for the failure is disturbance of the volume or density continuity caused by the failure. The criterion will be helpeful to find its application to the automatic control of the above mentioned tests. Moreover, the influence of the confining pressure of the rubber membrane case on the soil uniaxial and triaxial compression tests is also discussed. A calculation method is suggested to correct the calculation of cohesion. Based on exprimental and theretical analysis, the authors propose a new failure criterion for uniaxial and triaxial compression tests. The mechanism for the failure is disturbance of the volume or density continuity caused by the failure. The criterion will be helpeful to find its application to the automatic control of the above mentioned tests. Moreover, the influence of the confining pressure of the rubber membrane case on the soil uniaxial and triaxial compression tests is also discussed. A calculation method is suggested to correct the calculation of cohesion.
Based on a geomechanical analysis of the regional tectonic stress filed in combination with a in laboratory measuring of the geostress occuring at the oriented marble samples drilled out at the trial adit of the diversion tunnel proposed, this paper has made a preliminary study of geostress filed in the site, compared a relation of geomechanical macro analysis to geostress measuring results, and approached some problems with respect to geostress measuring by acoustic emission (AE) mdthod。 Based on a geomechanical analysis of the regional tectonic stress filed in combination with a in laboratory measuring of the geostress occuring at the oriented marble samples drilled out at the trial adit of the diversion tunnel proposed, this paper has made a preliminary study of geostress filed in the site, compared a relation of geomechanical macro analysis to geostress measuring results, and approached some problems with respect to geostress measuring by acoustic emission (AE) mdthod。
The natural state of soft soil is often used in geotechnical investigation of soft soils, and becomes the basic data for engineering design and construction account. In engineering practice, the state is various due to different divisions of soft soil, which are discussed in the article. The natural state of soft soil is often used in geotechnical investigation of soft soils, and becomes the basic data for engineering design and construction account. In engineering practice, the state is various due to different divisions of soft soil, which are discussed in the article.
To meet the need for engineering project, the disturbed and undisturbed soil samples were taken from the Laoying part of Huaihe Dam and the characteristics of shear creep and tensile creep of soil from the dam body and its foundation were studied in laboratory. The creep shear strength (C ) of clay is far lower (about 40%) than the instantaneous shear strength (C); Under the condition of same moisture, the long term tensile strength of clay is larger than the instantaneous, and the long term strain is much larger (about 2 times) than the instantaneous. The maximum depth of tensile crack in dam influenced by coal miming settlement was calculated by using the long term strength indexes of soil mass and was controlled by tensile strain. The cracking damage of dam body is predicted from the data obtained by a linear strain observation system to safeguard the dam. To meet the need for engineering project, the disturbed and undisturbed soil samples were taken from the Laoying part of Huaihe Dam and the characteristics of shear creep and tensile creep of soil from the dam body and its foundation were studied in laboratory. The creep shear strength (C ) of clay is far lower (about 40%) than the instantaneous shear strength (C); Under the condition of same moisture, the long term tensile strength of clay is larger than the instantaneous, and the long term strain is much larger (about 2 times) than the instantaneous. The maximum depth of tensile crack in dam influenced by coal miming settlement was calculated by using the long term strength indexes of soil mass and was controlled by tensile strain. The cracking damage of dam body is predicted from the data obtained by a linear strain observation system to safeguard the dam.
The prominent feature of many rheologic phenomena existing in engineering rock mass is the differential flow deformation failure. The characteristics of differential flow deformation failure feature are clarified from rheogic phenomena and field test results in this paper. A classification based on the relation between differential flow deformation failure and time is made. These failure types exist not only in a rock block or rock mass, but also in an engineering zone. The prominent feature of many rheologic phenomena existing in engineering rock mass is the differential flow deformation failure. The characteristics of differential flow deformation failure feature are clarified from rheogic phenomena and field test results in this paper. A classification based on the relation between differential flow deformation failure and time is made. These failure types exist not only in a rock block or rock mass, but also in an engineering zone.
It is an impatient and critical problem in the reconnaissance of the ground fissures in Xi'an area to develop simply equiped geophysical detection method in order to massive cavation and accelerate reconnaissance process. A study of geologic foundation for application radon measurement technique in the reconnaissance of ground fissures in Xi'an area is described in the paper. And in combination with engineering experience about 10 years, the characteristics of radon anomaly and the effectiveness of radon measurement on the ground fissures in Xi'an area area analysed. The conclusion is that the effectiveness of radon measurement on the ground fissures in Xi'an area is about 80%. It is an impatient and critical problem in the reconnaissance of the ground fissures in Xi'an area to develop simply equiped geophysical detection method in order to massive cavation and accelerate reconnaissance process. A study of geologic foundation for application radon measurement technique in the reconnaissance of ground fissures in Xi'an area is described in the paper. And in combination with engineering experience about 10 years, the characteristics of radon anomaly and the effectiveness of radon measurement on the ground fissures in Xi'an area area analysed. The conclusion is that the effectiveness of radon measurement on the ground fissures in Xi'an area is about 80%.
The deformation damage of high and steep rock slope at the upper reach of the Yellow River is affected by many factors, among which the effect of water is very obvious and consists of both static and dynamic effects of water. Using numerical simulation method, the effect degree and way were studied, respectively, from the softening of underground water, the water pressure of reservoir banks or the hydrostatic pressure and the pore water pressure, as well as the river erosion, the bank reform, the seepage force resulted from the precipitation and the reservoir sluicing. The deformation damage of high and steep rock slope at the upper reach of the Yellow River is affected by many factors, among which the effect of water is very obvious and consists of both static and dynamic effects of water. Using numerical simulation method, the effect degree and way were studied, respectively, from the softening of underground water, the water pressure of reservoir banks or the hydrostatic pressure and the pore water pressure, as well as the river erosion, the bank reform, the seepage force resulted from the precipitation and the reservoir sluicing.
Based on the analysis principles of engineering geomechanics of rock mass and analog simulation theory, the paper mainly studies the movement mechanism for anti dip layered slope rock mass and potential failure model. The analog simulation test method is used in analysis and study of slope failure of an open mine pit in process of mining operation. Based on the analysis principles of engineering geomechanics of rock mass and analog simulation theory, the paper mainly studies the movement mechanism for anti dip layered slope rock mass and potential failure model. The analog simulation test method is used in analysis and study of slope failure of an open mine pit in process of mining operation.
Based on the case study results about generating mechanisms of loess subsidence and paleoweathering crust on granite by using scanning electron microscope, the significant role of the scanning electron microscope in geotechnical engineering research is analysed in this paper. Based on the case study results about generating mechanisms of loess subsidence and paleoweathering crust on granite by using scanning electron microscope, the significant role of the scanning electron microscope in geotechnical engineering research is analysed in this paper.
The experiment of photoelastic mechanical model for failure mechanism of slope rock mass shows that the mining operation in the open pit has evident effect on the mechanical state of pit slopes by the action of stress and volume weight of the rock mass. Gelatin was used in the experiment. The model was designed on a scale 1∶1100. The displacement and deformation of the slope rock mass were modeled under the effect of self weight stress and tectonic stress. Then the failure mechanism for deformation of the rock mass by the effect of two stresses are discussed from the experiment result. The experiment of photoelastic mechanical model for failure mechanism of slope rock mass shows that the mining operation in the open pit has evident effect on the mechanical state of pit slopes by the action of stress and volume weight of the rock mass. Gelatin was used in the experiment. The model was designed on a scale 1∶1100. The displacement and deformation of the slope rock mass were modeled under the effect of self weight stress and tectonic stress. Then the failure mechanism for deformation of the rock mass by the effect of two stresses are discussed from the experiment result.