1997 Vol. 5, No. 3

论文
Crustal stability in the study area, which is comprositely affected by crustal constitution and structure, all kinds of geological processes, interaction with engineering constructions, etc., is a fuzzy concept with complicated features. So, the authors of this paper try to conduct evaluation of crustal stability using fuzzy mathematics. Crustal stability in the study area, which is comprositely affected by crustal constitution and structure, all kinds of geological processes, interaction with engineering constructions, etc., is a fuzzy concept with complicated features. So, the authors of this paper try to conduct evaluation of crustal stability using fuzzy mathematics.
The engineering geological models are emphatically discused, their conceptions and implications are expounded, and the basis and methods for construction of them are suggested in this paper. The applications and key points of the models, especially their scientific significance and far reaching influence are discussed. The engineering geological models are the consequence of condition research and provide a basis for analysis, calculation, and evaluation of an engineering project. The engineering geological models are emphatically discused, their conceptions and implications are expounded, and the basis and methods for construction of them are suggested in this paper. The applications and key points of the models, especially their scientific significance and far reaching influence are discussed. The engineering geological models are the consequence of condition research and provide a basis for analysis, calculation, and evaluation of an engineering project.
Considering the requirement of the second-stage engineering design in Meishan mine, the paper a fuzzy dynamic cluster analysis method for zoning of engineering rockmass stability of underground mines and partial result are present. The research involves the acquisition and analysis of geological data, the selection and determination of factors for zoning and the application of fuzzy dynamic cluster analysis method for zoning engineering rockmass in undergroundmines. Considering the requirement of the second-stage engineering design in Meishan mine, the paper a fuzzy dynamic cluster analysis method for zoning of engineering rockmass stability of underground mines and partial result are present. The research involves the acquisition and analysis of geological data, the selection and determination of factors for zoning and the application of fuzzy dynamic cluster analysis method for zoning engineering rockmass in undergroundmines.
Determination of heights of three zones(inbreak, crack, and bent zones) of mined out area provides a basis for predicting deformatiom and fracture of earths surface. Among several factors,dip angle of coal seam is the most important factor affecting the height of the three zones. Determination of heights of three zones from experience data if of certain artificial character. Relationship between height of inbreak zone and fracture zone and dip angle of steeply dipping coal seam has been discussed. In the paper, a method for determination of heights of three zones through analsysing redistrbution of gragh of stress which if obataine from non linear finite element simulation in moderately and gently dipping seam is proposed. Then, we predict the heights of three zones in two by this method. Determination of heights of three zones(inbreak, crack, and bent zones) of mined out area provides a basis for predicting deformatiom and fracture of earths surface. Among several factors,dip angle of coal seam is the most important factor affecting the height of the three zones. Determination of heights of three zones from experience data if of certain artificial character. Relationship between height of inbreak zone and fracture zone and dip angle of steeply dipping coal seam has been discussed. In the paper, a method for determination of heights of three zones through analsysing redistrbution of gragh of stress which if obataine from non linear finite element simulation in moderately and gently dipping seam is proposed. Then, we predict the heights of three zones in two by this method.
In this paper, the Sarma non vertical slice method and non linear finite element method are used to analyze the slope stability in Xiaoshan Power Staton at the workshop which is 176 m high and slope angle is 35as a whole. On the basis of analysis results by using the methods, the safety factor of slope is more than 1.30 which means the slope of workshop is stable in the natural state though there exits some tensile zone and plastic zone in rockmass on the slope. In consideration of the earthquake with magntude of 6.0 it is still in a limit equlibrum. But it is necessary to reinforce part of the slope in order to guarantee the workshop of Xiaoshan Power Station. In this paper, the Sarma non vertical slice method and non linear finite element method are used to analyze the slope stability in Xiaoshan Power Staton at the workshop which is 176 m high and slope angle is 35as a whole. On the basis of analysis results by using the methods, the safety factor of slope is more than 1.30 which means the slope of workshop is stable in the natural state though there exits some tensile zone and plastic zone in rockmass on the slope. In consideration of the earthquake with magntude of 6.0 it is still in a limit equlibrum. But it is necessary to reinforce part of the slope in order to guarantee the workshop of Xiaoshan Power Station.
The RMR SMR system for classification of slope rockmasses is briefly introduced in this paper. The modified opinions on the application of SMR system to classification of slope rockmass are proposed and discussed on the basis of natural historic analysis and stability evaluation for the Baishuiyu slope. The RMR SMR system for classification of slope rockmasses is briefly introduced in this paper. The modified opinions on the application of SMR system to classification of slope rockmass are proposed and discussed on the basis of natural historic analysis and stability evaluation for the Baishuiyu slope.
In order to obtain an optimum slope angle corresponding to a stability factor, the stability factor of a wedge shaped four plane slip rockmass of double slipp planes and any slope height at different slope angle which can be forward caculated continuously is given in the paper. A test calculation of the stope slope in Shenfu Dongsheng and Jungar coal fields by using this method gives a more safety reserve of the slope. In order to obtain an optimum slope angle corresponding to a stability factor, the stability factor of a wedge shaped four plane slip rockmass of double slipp planes and any slope height at different slope angle which can be forward caculated continuously is given in the paper. A test calculation of the stope slope in Shenfu Dongsheng and Jungar coal fields by using this method gives a more safety reserve of the slope.
An optimum design theory of anchor pile is suggeste in the paper. A case analysis indicateds that the optimum design method has its advantage over traditional method in large reducing construction price of a engineering project. An optimum design theory of anchor pile is suggeste in the paper. A case analysis indicateds that the optimum design method has its advantage over traditional method in large reducing construction price of a engineering project.
The problem presented in this paper is a stability analysis of rock block, separated by a set of two geologic structural surfaces from slope rockmass and loaded by a 3 D force system without common point of force action. The method developed in this paper is based upon the use of vector analysis, the principle of nodal equivalent forces, and that the distribution of friction force at any point on a geologic structural surface is treated as a function of the normal pressure acted on that point on the surface and the relative displacement of the block at that point along the surface. Thus the block movement may involve not only parallel translation, but also sliding rotation and other 3 D movement. Finally, a computer program is proposed to solve the stability of rock block for various possible modes of its instability. The problem presented in this paper is a stability analysis of rock block, separated by a set of two geologic structural surfaces from slope rockmass and loaded by a 3 D force system without common point of force action. The method developed in this paper is based upon the use of vector analysis, the principle of nodal equivalent forces, and that the distribution of friction force at any point on a geologic structural surface is treated as a function of the normal pressure acted on that point on the surface and the relative displacement of the block at that point along the surface. Thus the block movement may involve not only parallel translation, but also sliding rotation and other 3 D movement. Finally, a computer program is proposed to solve the stability of rock block for various possible modes of its instability.
Residual soil on granite is one of symmict soils, with its specific characteristics which results in a particular foundation loading capacity. From a large amount of field and indoor experimental data, the feasibility of other measuring methods for assessing foundation loading capacity was determined, and a revised scheme of determining shallow foundation loading capacity by SPT method is suggested by the author in the paper. The relationship between water content in soil, shallow foundation loading capacity and the affecting factors is discussed. Residual soil on granite is one of symmict soils, with its specific characteristics which results in a particular foundation loading capacity. From a large amount of field and indoor experimental data, the feasibility of other measuring methods for assessing foundation loading capacity was determined, and a revised scheme of determining shallow foundation loading capacity by SPT method is suggested by the author in the paper. The relationship between water content in soil, shallow foundation loading capacity and the affecting factors is discussed.
Chaotic characteristication of soft soil foundation is analyzed on the basis of chaotic theory and its capacity can be also identifited. Comparing with the value of P 0.02 , the capacity by means of chaotic model is safe in the engineering. Chaotic characteristication of soft soil foundation is analyzed on the basis of chaotic theory and its capacity can be also identifited. Comparing with the value of P 0.02 , the capacity by means of chaotic model is safe in the engineering.
Variation in geotemperature is one of the most important factors affecting the weathering process and the failure of shallow large of slope rockmass, the geotemperature field, which varies with the weather, is characterized by cyclic variation. Moreover, the thermal stress, was an alternative stress caused by geotemperature variation, can lead the fatigue failure of rockmass. In this paper, the distribution of geotemperature field and the thermal stress are analysed, the mechanism and criterion of fatigue failure are also discussed. Variation in geotemperature is one of the most important factors affecting the weathering process and the failure of shallow large of slope rockmass, the geotemperature field, which varies with the weather, is characterized by cyclic variation. Moreover, the thermal stress, was an alternative stress caused by geotemperature variation, can lead the fatigue failure of rockmass. In this paper, the distribution of geotemperature field and the thermal stress are analysed, the mechanism and criterion of fatigue failure are also discussed.
The natural heat convection and the water rock thermal exchange in the aquifer thermal transfer (ATT) process are studied thoroughly in this paper in order to clarify their effect upon the process. In view of the restrictions of the conventional flow and thermal transfer equations, new equations are given to describe the two actions which are simulated accordingly by construction of a three dimensional nonlinear ATT model. Then a multi well test conducted in the second confined aquifer in Shanghai provides good data for our study. Comparison of the simulated results with the observed data shows that the natural heat convection affects the ATT process obviously and therefore can not be neglected, and that the water rock thermal exchange has insignificant effect on the ATT process because of the short duration of the process. The natural heat convection and the water rock thermal exchange in the aquifer thermal transfer (ATT) process are studied thoroughly in this paper in order to clarify their effect upon the process. In view of the restrictions of the conventional flow and thermal transfer equations, new equations are given to describe the two actions which are simulated accordingly by construction of a three dimensional nonlinear ATT model. Then a multi well test conducted in the second confined aquifer in Shanghai provides good data for our study. Comparison of the simulated results with the observed data shows that the natural heat convection affects the ATT process obviously and therefore can not be neglected, and that the water rock thermal exchange has insignificant effect on the ATT process because of the short duration of the process.
Based on the detection principle of ground penetrating radar, this paper analyses the feasibility of detecting fractured rock zone in mine roadway with the radar. In the case of detecting fractured zone in mine roadway Huafeng Colliery, a detection method, image analysis and application of the result are suggested. The result shows that the ground penetrating radar can be used to detect the fractured rock zone in mine roadway and the result can be used to design anchor support in the roadway. Based on the detection principle of ground penetrating radar, this paper analyses the feasibility of detecting fractured rock zone in mine roadway with the radar. In the case of detecting fractured zone in mine roadway Huafeng Colliery, a detection method, image analysis and application of the result are suggested. The result shows that the ground penetrating radar can be used to detect the fractured rock zone in mine roadway and the result can be used to design anchor support in the roadway.
Microaggregate is a basic structural unit in natural cohesive soil, composition of microaggregate and its stability and strength in the presence of water are the important factors determining the engineering property of the cohesive soil. A comparision between results of granulometric and microaggregate compositions of two study of causes for formation of water stable and water unstable microaggregates. From the obtained data we discuss the engineering properties of the soils in the paper. Microaggregate is a basic structural unit in natural cohesive soil, composition of microaggregate and its stability and strength in the presence of water are the important factors determining the engineering property of the cohesive soil. A comparision between results of granulometric and microaggregate compositions of two study of causes for formation of water stable and water unstable microaggregates. From the obtained data we discuss the engineering properties of the soils in the paper.