1994 Vol. 2, No. 1

论文
The aim of this study is to introduce the concept of progressive failure into the stablity analysis of slope. The peak strength and residual strength of rock and soil masses are reasonably consided to be different in its role in the stability analysis. The comparative study with other methods of analysis and practical examples show the proposed computational model can be used for preliminary evaluation of slope stdbility and estimation of scope of failure and instability. This study also shows the important role of water in the slope stability. The aim of this study is to introduce the concept of progressive failure into the stablity analysis of slope. The peak strength and residual strength of rock and soil masses are reasonably consided to be different in its role in the stability analysis. The comparative study with other methods of analysis and practical examples show the proposed computational model can be used for preliminary evaluation of slope stdbility and estimation of scope of failure and instability. This study also shows the important role of water in the slope stability.
After analysing the geological features and seepage characterisucs of rock masses in the paper a lumped parmeter mathematical model for rock masses with couple of seepage and stress-strain is presented. The authors makes an derivation from recursion formula on above-mentiond model identification. Finally,applicationof the model is discussed. After analysing the geological features and seepage characterisucs of rock masses in the paper a lumped parmeter mathematical model for rock masses with couple of seepage and stress-strain is presented. The authors makes an derivation from recursion formula on above-mentiond model identification. Finally,applicationof the model is discussed.
new index, the air-dry moisture content W65, is recommended in the defect of free swelling ratio ef in the identification and classification of the swelling soil. The weasurement method of the index. its relationship to the physicochemical activities. moisture index and free swell ef of the swelling soil are also studied in this paper. The results indicate that the W65 can be better than ef or WL to reflect properties and composition or physicochemical activities of the swelling soil, and ef orWL is better than W65 to reflect property of the size composition or dispcrsity. Finally, on the basis of the results of identification and classification of ef, in consideration of the advantage of the plasticity chart adopted,a new mcthod of W65-WL chart is recommended for identifying and classifying the swelling soil. it is applicable to identify swelling soil and red clay, and is more reasonable and applicable than ef. new index, the air-dry moisture content W65, is recommended in the defect of free swelling ratio ef in the identification and classification of the swelling soil. The weasurement method of the index. its relationship to the physicochemical activities. moisture index and free swell ef of the swelling soil are also studied in this paper. The results indicate that the W65 can be better than ef or WL to reflect properties and composition or physicochemical activities of the swelling soil, and ef orWL is better than W65 to reflect property of the size composition or dispcrsity. Finally, on the basis of the results of identification and classification of ef, in consideration of the advantage of the plasticity chart adopted,a new mcthod of W65-WL chart is recommended for identifying and classifying the swelling soil. it is applicable to identify swelling soil and red clay, and is more reasonable and applicable than ef.
This paper deals with the composition and microstructure of red clay. Basing on the data a generalized model for its microstructure is suggested. According to this model, the engineeirng properties of red clay are discussed. This paper deals with the composition and microstructure of red clay. Basing on the data a generalized model for its microstructure is suggested. According to this model, the engineeirng properties of red clay are discussed.
This paper introduces a new testing method developed by Okuboet el. which is used to control a linear combination of force and displacenlent. It was implemented on a specially designed servo-controlled testing system and a MTS machine successfully.The method may be used for many testing purposes concerning the mechanisms of weakening processes. Complete stress-strain curve can be obtained by this method and its application gives some testing methods such as generalized relaxation test, which may be used to investigate time-dependent failure behaviour ofrock. This paper introduces a new testing method developed by Okuboet el. which is used to control a linear combination of force and displacenlent. It was implemented on a specially designed servo-controlled testing system and a MTS machine successfully.The method may be used for many testing purposes concerning the mechanisms of weakening processes. Complete stress-strain curve can be obtained by this method and its application gives some testing methods such as generalized relaxation test, which may be used to investigate time-dependent failure behaviour ofrock.
Characteristics of spatial evolution of deformation and failure of discontinuous rockmass were investigated by analyzing location of accoustic emission events and geometry of the fracture surfaces. The results show that the spatial dynamic process of deformation and failure of single-jointed rockamss were controled by the joint angle. The fracture mode of single-jointed rockmass changes from sudden failure accompanying with local concentration of AE events to progressive failure with AE events dispersing in the whole jointed layer. Correspondingly, the fracture surfaces developed from simple continuous interfaces of rock-joint substances to complex discontinuous layer inter-joint subfractures. For complex jointed rockmass, the deformation and failure process were controled by a (set of) main discontinuity, Strong AE events occured at or near the conjunction parts of discontinuities. In modes containing several paralell main discontinuities, AE events during the last deformation stage were located only in the final filure surfaces. Characteristics of spatial evolution of deformation and failure of discontinuous rockmass were investigated by analyzing location of accoustic emission events and geometry of the fracture surfaces. The results show that the spatial dynamic process of deformation and failure of single-jointed rockamss were controled by the joint angle. The fracture mode of single-jointed rockmass changes from sudden failure accompanying with local concentration of AE events to progressive failure with AE events dispersing in the whole jointed layer. Correspondingly, the fracture surfaces developed from simple continuous interfaces of rock-joint substances to complex discontinuous layer inter-joint subfractures. For complex jointed rockmass, the deformation and failure process were controled by a (set of) main discontinuity, Strong AE events occured at or near the conjunction parts of discontinuities. In modes containing several paralell main discontinuities, AE events during the last deformation stage were located only in the final filure surfaces.
In this paper an analytic hierarchy process(AHP) is used to show the influentical and interactive factors in rock slope, then a stability evaluation method by analogy ix givend. It can fully show the influence and interaction between the factors and the integrating of the qualitative data with the quantitave data. The method on the basis of the practical geological model can seize overall features, so its evaluation result is reliable. In this paper an analytic hierarchy process(AHP) is used to show the influentical and interactive factors in rock slope, then a stability evaluation method by analogy ix givend. It can fully show the influence and interaction between the factors and the integrating of the qualitative data with the quantitave data. The method on the basis of the practical geological model can seize overall features, so its evaluation result is reliable.
ased on site investigation in the field and underground shafT and drift, combining with laboratory analysis, we study on the structure, lithology and hydraulic charactristics of F3 fracture zone and discuss the causes of sudden flooding of the mine debris flow during underground mining. Synthetic studies on the hydrogeological framework, hydrochemistry, water isotopes and hydrogeothermics help us to anticipate potential engineering problems in further mining and put forward plans for prevention.The main purpose of this paper is that we pay much attention to the combination of engineering analysis with analysis of groundwater flow systems. It is proved that this is a right way to deal with hydrogeological and engineering problems in the mine area. In this manner we can reveal the causes and mechanism of some hazards during mining work. This facilitates us to take effective measures for preventing and controlling the potential hazards. ased on site investigation in the field and underground shafT and drift, combining with laboratory analysis, we study on the structure, lithology and hydraulic charactristics of F3 fracture zone and discuss the causes of sudden flooding of the mine debris flow during underground mining. Synthetic studies on the hydrogeological framework, hydrochemistry, water isotopes and hydrogeothermics help us to anticipate potential engineering problems in further mining and put forward plans for prevention.The main purpose of this paper is that we pay much attention to the combination of engineering analysis with analysis of groundwater flow systems. It is proved that this is a right way to deal with hydrogeological and engineering problems in the mine area. In this manner we can reveal the causes and mechanism of some hazards during mining work. This facilitates us to take effective measures for preventing and controlling the potential hazards.
Light rail line 1 in Chongging City will be built in a geological environment characteristic of a mountainous city. Selection of its layout depth is an important problem. In the paper, Based on analysis of the engineering geological setting,the principles for determination of its layout depth is proposed ;the standard of the minimum safe ratios of its equivalent thickess of its coverage to spen is given; and the concrete suggestion of its layout depth is put forward. Light rail line 1 in Chongging City will be built in a geological environment characteristic of a mountainous city. Selection of its layout depth is an important problem. In the paper, Based on analysis of the engineering geological setting,the principles for determination of its layout depth is proposed ;the standard of the minimum safe ratios of its equivalent thickess of its coverage to spen is given; and the concrete suggestion of its layout depth is put forward.
In this paper the physical and mechanical properties of powdered coal slag from an electropower plant and its use as a filling material for construction of a high (10. 5m) slag dam are decribed. The operation of this plant shous highquality of the slag, which was used in construction of the highest slag dam in China. indicating its stable storage and safe operation. The obtained results on the engineering geological indexes and the developed techniques can be used as a reference for relevant engineering projects. In this paper the physical and mechanical properties of powdered coal slag from an electropower plant and its use as a filling material for construction of a high (10. 5m) slag dam are decribed. The operation of this plant shous highquality of the slag, which was used in construction of the highest slag dam in China. indicating its stable storage and safe operation. The obtained results on the engineering geological indexes and the developed techniques can be used as a reference for relevant engineering projects.
The paper describes the results of marine engieering geology research incoastal zones, estuarine deltas, harbour constructions,offshore oil exploitation and technigres method. The study shous the present situation of marine engineering geology theories in China, microstructures of marine sediments, soil dynamic properties, prediction of liguefaction under ocean wave loading and stability treatment of undersea soft soil. The development trend of the discipline and some suggestions on further marine engineering geology research are put forward in this paper. The paper describes the results of marine engieering geology research incoastal zones, estuarine deltas, harbour constructions,offshore oil exploitation and technigres method. The study shous the present situation of marine engineering geology theories in China, microstructures of marine sediments, soil dynamic properties, prediction of liguefaction under ocean wave loading and stability treatment of undersea soft soil. The development trend of the discipline and some suggestions on further marine engineering geology research are put forward in this paper.