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Editor Work1994 Vol. 2, No. 3
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1994, 2(3): 1-12.
Abstract
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In this paper the frictional properties of sliding surface during block movement are disscussed on the basis of laboratory vibration experiment.A 3-D dynamic equation is deduced for describing the block movement due to vibration.According to the transmission law of acceleration betweeen layers the stability factor of each layer during vibration process can be determined by the proposed method in this paper.
In this paper the frictional properties of sliding surface during block movement are disscussed on the basis of laboratory vibration experiment.A 3-D dynamic equation is deduced for describing the block movement due to vibration.According to the transmission law of acceleration betweeen layers the stability factor of each layer during vibration process can be determined by the proposed method in this paper.
1994, 2(3): 13-20.
The Qiabuqihai and Shankou Hydropower Stations,which are planned to be constructed on the Tekes River, Xinjiang Uygur Autonomous Region,are located in Tianshan area, where fault structures with intense Rrecent activities are widely developed.Field investigation shows that 5 major faults within the engineering sites were active during the Quaternary.Various techniques,including microstructural analysis of deformed rocks,analysis of surface textures of quartz grain,and TL dating,were used in the study of the samples collected from the Tekes fault and F1 fault within the engineering sites.The results show that ductile deformation at lower strain rate occurred along the faults during early stage,followed by a brittle fracturing process in the later stage.The main period of fault activity was by the end of Pliocene to Early Pleistocene.The differential stress during the faulting process in this period is 130 MPa.The faults are characterized principally by compressional movement.The faults have been activated since the pleistocene, although the intensity of fault activities has become weaked.The lower time limit of the last strong faulting event was by the end of late Pleistocene or the beginning of the Holocene.In order to ensure the safety of constrctions,it is suggested that the engineering sites should keep away from the active faults,and some safety measures should be considered in the design.
The Qiabuqihai and Shankou Hydropower Stations,which are planned to be constructed on the Tekes River, Xinjiang Uygur Autonomous Region,are located in Tianshan area, where fault structures with intense Rrecent activities are widely developed.Field investigation shows that 5 major faults within the engineering sites were active during the Quaternary.Various techniques,including microstructural analysis of deformed rocks,analysis of surface textures of quartz grain,and TL dating,were used in the study of the samples collected from the Tekes fault and F1 fault within the engineering sites.The results show that ductile deformation at lower strain rate occurred along the faults during early stage,followed by a brittle fracturing process in the later stage.The main period of fault activity was by the end of Pliocene to Early Pleistocene.The differential stress during the faulting process in this period is 130 MPa.The faults are characterized principally by compressional movement.The faults have been activated since the pleistocene, although the intensity of fault activities has become weaked.The lower time limit of the last strong faulting event was by the end of late Pleistocene or the beginning of the Holocene.In order to ensure the safety of constrctions,it is suggested that the engineering sites should keep away from the active faults,and some safety measures should be considered in the design.
1994, 2(3): 21-26.
Regional stability engineering geology was established,developedand matured in China.After its establishment in 1950s,now its systematic theory and systematic studying methods were formulated,and so it becomes a new subject that plays an important role in construction of national economy.This review on the process of its establishment and development brings about a great advance in its method of thinking and theory,and also brings about a great important significance in further to a large extent development of its theory and practice.
Regional stability engineering geology was established,developedand matured in China.After its establishment in 1950s,now its systematic theory and systematic studying methods were formulated,and so it becomes a new subject that plays an important role in construction of national economy.This review on the process of its establishment and development brings about a great advance in its method of thinking and theory,and also brings about a great important significance in further to a large extent development of its theory and practice.
1994, 2(3): 27-33.
This paper deals with the main problems on fast pre-construction geological forecasting of shiplock high slope rock mass in Three Gorges Project.The necessarity and technical method for fast pre-construction geological forecasting of shiplock high slope rock mass are studied in the paper.The back analysis and progressive design of shiplock slope are illustacted according to the results of fast pre-construction geological forecasting by the author.Finally,the pre-control measures for slope rock mass is analysied.
This paper deals with the main problems on fast pre-construction geological forecasting of shiplock high slope rock mass in Three Gorges Project.The necessarity and technical method for fast pre-construction geological forecasting of shiplock high slope rock mass are studied in the paper.The back analysis and progressive design of shiplock slope are illustacted according to the results of fast pre-construction geological forecasting by the author.Finally,the pre-control measures for slope rock mass is analysied.
1994, 2(3): 34-42.
On the basis of site investigation and comprehensive analysis,the 3-D geomechanical modelling tests were conducted for study of the fault activities in Xian area.A dynamic model of the recent fault activity is set up.The relations between the formation of Xian ground fissures and the fault activities are discussed.In this paper,the model design,the modelling techniques and the results of all studies are presented in detail.
On the basis of site investigation and comprehensive analysis,the 3-D geomechanical modelling tests were conducted for study of the fault activities in Xian area.A dynamic model of the recent fault activity is set up.The relations between the formation of Xian ground fissures and the fault activities are discussed.In this paper,the model design,the modelling techniques and the results of all studies are presented in detail.
1994, 2(3): 43-53.
This Paper deals with the new advancees in theories and applications of rock classification on the basis of the cited here two international classification systems,and three Chinese rock classifications based on individial properties and a rock classification based on three rock characteristics in connection with real cases,and further discusses the problems on deeper and wider extensions of the rock classification thema.
This Paper deals with the new advancees in theories and applications of rock classification on the basis of the cited here two international classification systems,and three Chinese rock classifications based on individial properties and a rock classification based on three rock characteristics in connection with real cases,and further discusses the problems on deeper and wider extensions of the rock classification thema.
1994, 2(3): 54-61.
This paper,reviewing on strengh tests of fissured rock mass discusses mechanism and basic law of direct shear failure of fissured rock mass from a large amount of in situ test data and its affecting factors in the fissure rock mass.A set of affective experimental techniques are given and some necessary and essential conditions for failure of fissured rock are provided.It plays an importent role in rock mechanics and solid mechanics.
This paper,reviewing on strengh tests of fissured rock mass discusses mechanism and basic law of direct shear failure of fissured rock mass from a large amount of in situ test data and its affecting factors in the fissure rock mass.A set of affective experimental techniques are given and some necessary and essential conditions for failure of fissured rock are provided.It plays an importent role in rock mechanics and solid mechanics.
In the paper,firstly ,we review the database used in studying joint roughness coefficient(JRC)in rock mass and analyze of various methods appliied evaluation JRC.Then,basing on the detailed survey and study of in-situ joint surface profiles,we develope a Bartons straight edge method for evaluating JRC.At last,we put forward a new scientific way for directive statistical evaluation of JRC in the light of rock properties.
In the paper,firstly ,we review the database used in studying joint roughness coefficient(JRC)in rock mass and analyze of various methods appliied evaluation JRC.Then,basing on the detailed survey and study of in-situ joint surface profiles,we develope a Bartons straight edge method for evaluating JRC.At last,we put forward a new scientific way for directive statistical evaluation of JRC in the light of rock properties.
1994, 2(3): 72-80.
Based on the numerical data of roof weighting monitoring and forecasting recorded by DKJ-1 mine pressure computer monitoring system in two coal mines the authors analysed thoroughly the law of abutmant pressure manifestations of 13 roof weigthings within 8 months.The abutment pressure manifestations can be distinguishedd into two types,thecompression-rebound andfluctuationtypes,and their relation,the time difference and position difference of roof weightings are summarized.In this paper,the authors also introduce the method ofrecognizing roof weighting omen by the computer monitoring system and the excellent result of 13 roof weighting fore-casts was accurately obtained.
Based on the numerical data of roof weighting monitoring and forecasting recorded by DKJ-1 mine pressure computer monitoring system in two coal mines the authors analysed thoroughly the law of abutmant pressure manifestations of 13 roof weigthings within 8 months.The abutment pressure manifestations can be distinguishedd into two types,thecompression-rebound andfluctuationtypes,and their relation,the time difference and position difference of roof weightings are summarized.In this paper,the authors also introduce the method ofrecognizing roof weighting omen by the computer monitoring system and the excellent result of 13 roof weighting fore-casts was accurately obtained.
1994, 2(3): 81-90.
The hydrogeological condictions of the deep rock at San shan island gold mine is examined from the observation data of exploratory wells and drift. The recharge water quantity from each water body(including sea water、salt water in the deep rock and fresh water in Quaternary deposits)is determined using the laboratory test on isotope 18O.Numerical model and nonlinear porgramming method are used to test and calibrate the previous examination results,and to determine hydrogeological paremeters.The mine water flow in the next digging operation is also predicated by numerical model.A sufficient numerical analysis,in which the deviation between practical and predicated water flows may exist due to some unknow information and different digging methods,is presented in this paper.
The hydrogeological condictions of the deep rock at San shan island gold mine is examined from the observation data of exploratory wells and drift. The recharge water quantity from each water body(including sea water、salt water in the deep rock and fresh water in Quaternary deposits)is determined using the laboratory test on isotope 18O.Numerical model and nonlinear porgramming method are used to test and calibrate the previous examination results,and to determine hydrogeological paremeters.The mine water flow in the next digging operation is also predicated by numerical model.A sufficient numerical analysis,in which the deviation between practical and predicated water flows may exist due to some unknow information and different digging methods,is presented in this paper.
1994, 2(3): 91-94.
Some appreciable problems on dewatering in foundation pit are discussed in this paper,such as correct determination of hydrogeological parameters and strenthening management and supervision of the operation in foundation pit.The author also suggests a pumping test in small diameter well for engineering investigation.
Some appreciable problems on dewatering in foundation pit are discussed in this paper,such as correct determination of hydrogeological parameters and strenthening management and supervision of the operation in foundation pit.The author also suggests a pumping test in small diameter well for engineering investigation.
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