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Editor Work1998 Vol. 6, No. 3
Previous Issue
1998, 6(3): 193-198.
Abstract
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Coastal cities are the most rapid economic development areas in China, in which economic and urban constractions are rapidly developed in the last few years, the scale and intensity of urban land use increase and hence giverise to environmental engineering geological problems which are also serious day by day. Main types of environmental engineering geological problems in coastal cities are analysed and the causes for the environmental engineering geological problems are also studied in this paper.
Coastal cities are the most rapid economic development areas in China, in which economic and urban constractions are rapidly developed in the last few years, the scale and intensity of urban land use increase and hence giverise to environmental engineering geological problems which are also serious day by day. Main types of environmental engineering geological problems in coastal cities are analysed and the causes for the environmental engineering geological problems are also studied in this paper.
1998, 6(3): 199-204.
Linjiaya landslide is a landslide system with double sliding bodies. This paper deals with its characteristics and the factors controlling its deformation and analyses its deformation mechanism. General Sarma method and new Sarma method, which considers the sliding effect of upper sliding body, are used in analysis of Linjiaya landslide stability. It is shown that the sliding effect of upper sliding body should be considered, so that the calculation result is more effective in design of controlling landslide.
Linjiaya landslide is a landslide system with double sliding bodies. This paper deals with its characteristics and the factors controlling its deformation and analyses its deformation mechanism. General Sarma method and new Sarma method, which considers the sliding effect of upper sliding body, are used in analysis of Linjiaya landslide stability. It is shown that the sliding effect of upper sliding body should be considered, so that the calculation result is more effective in design of controlling landslide.
1998, 6(3): 205-210.
Ground instability, calculated seismic settlement values and isolation function of a liquefied soil layer are analyzed herein. The relationship between liquefaction index, ground failure, isolation function of a liquefied soil layer, and earthguake damage of multistoried buildings are also studied in this papar. The classes of liquefaction hazards are determined according to the double function principle of liquefied soil, and methods for assessment of seismic liquefaction hazards at construction sites are suggested.
Ground instability, calculated seismic settlement values and isolation function of a liquefied soil layer are analyzed herein. The relationship between liquefaction index, ground failure, isolation function of a liquefied soil layer, and earthguake damage of multistoried buildings are also studied in this papar. The classes of liquefaction hazards are determined according to the double function principle of liquefied soil, and methods for assessment of seismic liquefaction hazards at construction sites are suggested.
1998, 6(3): 211-216.
In this paper, the lithological characteristics of large thick unconsolidated layers in vertical and lateral directions, in selected typical coal mines of Huainan, Huaibei, Datun, Yanzhou and Xingtai coalfields in Huanghuai area are analysed. Meanwhile, the influence of mining activities on ground water regime is also discussed from the aspects of water bodies, rock layers, and mining activities, etc. The study is of benefit to solution of some practical engineering problems.
In this paper, the lithological characteristics of large thick unconsolidated layers in vertical and lateral directions, in selected typical coal mines of Huainan, Huaibei, Datun, Yanzhou and Xingtai coalfields in Huanghuai area are analysed. Meanwhile, the influence of mining activities on ground water regime is also discussed from the aspects of water bodies, rock layers, and mining activities, etc. The study is of benefit to solution of some practical engineering problems.
1998, 6(3): 217-222.
The instantaneous mechanical properties and creep behavior of fault gouge are closely related with its water content. Its mechanical parameters will decrease with increasing water content and the relationship between them shows a negative exponential function. Demarcation of water content has great practical significance. The demarcated water content for f 246 gouge in a studied zone is 8 to 10 percents.
The instantaneous mechanical properties and creep behavior of fault gouge are closely related with its water content. Its mechanical parameters will decrease with increasing water content and the relationship between them shows a negative exponential function. Demarcation of water content has great practical significance. The demarcated water content for f 246 gouge in a studied zone is 8 to 10 percents.
1998, 6(3): 223-229.
The knowledge of drained residual strength of cohesive soils is essential to the geotechnical engineer involved in handling landslide, slope stability, embankment design, and interaction of pile with foundation soil. This paper presents a review on measuring methods for residual strength and factors influencing residual strength of cohesive soils. Drained residual shear tests of volcanics derived soil sampled in Lantau Island of Hong Kong are performed on Bromhead ringshear apparatus. The results of investigations exhibit a nonlinear relation between residual strength and effective normal stress. A comparison of residual strength obtained by the single stage shearing with that by the multistage shearingindicates that the multistage shearing may give erroneous results due to lateralwall friction resulting from excessive settlement of soil sample during consolidation and shearing.
The knowledge of drained residual strength of cohesive soils is essential to the geotechnical engineer involved in handling landslide, slope stability, embankment design, and interaction of pile with foundation soil. This paper presents a review on measuring methods for residual strength and factors influencing residual strength of cohesive soils. Drained residual shear tests of volcanics derived soil sampled in Lantau Island of Hong Kong are performed on Bromhead ringshear apparatus. The results of investigations exhibit a nonlinear relation between residual strength and effective normal stress. A comparison of residual strength obtained by the single stage shearing with that by the multistage shearingindicates that the multistage shearing may give erroneous results due to lateralwall friction resulting from excessive settlement of soil sample during consolidation and shearing.
1998, 6(3): 230-237.
Engineering rock mass is always bursted and crushed along its discontinuities. Quantifing deterioration of rock mass with discontinuities becomes a basis for prospecting and designing engineering rock mass. Several methods for quantification of rock quality are presented and discussed in this paper. Finally, we proposed a trend in quantification of rock quality.
Engineering rock mass is always bursted and crushed along its discontinuities. Quantifing deterioration of rock mass with discontinuities becomes a basis for prospecting and designing engineering rock mass. Several methods for quantification of rock quality are presented and discussed in this paper. Finally, we proposed a trend in quantification of rock quality.
1998, 6(3): 238-243.
Previous method for analysis of measured displacement data has mainly been focused on displacement time. Actually, monitoring data contains more useful information for engineering design and construction, including information of displacement space. For engineering design and construction, the information of displacement space is needed, in addition to displacement time. The method for synthetically analyzing displacement in time and space is suggested the purpose of synthesizing the information of displacement time and displacement space to serve for engineering design and construction. According to its representive form the method can be performed in vertical line way and camber way. Taking the shiplock slope engineering of Wuqiangxi Hydropower Station as an example, we further explained the principle and application of the method.
Previous method for analysis of measured displacement data has mainly been focused on displacement time. Actually, monitoring data contains more useful information for engineering design and construction, including information of displacement space. For engineering design and construction, the information of displacement space is needed, in addition to displacement time. The method for synthetically analyzing displacement in time and space is suggested the purpose of synthesizing the information of displacement time and displacement space to serve for engineering design and construction. According to its representive form the method can be performed in vertical line way and camber way. Taking the shiplock slope engineering of Wuqiangxi Hydropower Station as an example, we further explained the principle and application of the method.
1998, 6(3): 244-248.
This article deals with geological environment, scale and characteristics of the filling section landslide on Shipa channel of the right main canal for Shengzhong Reservoir, analyses how the leakage affects C、 values of the silty mudstone, discusses the causes for occurrence of landslide on water diversion filling channel lateritic hilly zone, calculates the influence of pore water pressure and seepage force on stability of filling canal bank and introduces anti leakage measures in the studied area so as to provide a reference for similar projects.
This article deals with geological environment, scale and characteristics of the filling section landslide on Shipa channel of the right main canal for Shengzhong Reservoir, analyses how the leakage affects C、 values of the silty mudstone, discusses the causes for occurrence of landslide on water diversion filling channel lateritic hilly zone, calculates the influence of pore water pressure and seepage force on stability of filling canal bank and introduces anti leakage measures in the studied area so as to provide a reference for similar projects.
1998, 6(3): 249-252.
Examination of the available literature at home and abroad and authors in situ investigations led to find that landslide dams and dammed lakes lie mainly in mountain zones. The study indicates that the engineering geological problems of landslide damming mainly include infiltrational deformation, stability, settlement, and liquefaction of sand layers. The above engineering geologic problems are discussed in this paper for landslide damming, and its utilization is analysed on the basis of an actual examples. So, this paper provides a guide for exploration of landslide dams and dammed lakes.
Examination of the available literature at home and abroad and authors in situ investigations led to find that landslide dams and dammed lakes lie mainly in mountain zones. The study indicates that the engineering geological problems of landslide damming mainly include infiltrational deformation, stability, settlement, and liquefaction of sand layers. The above engineering geologic problems are discussed in this paper for landslide damming, and its utilization is analysed on the basis of an actual examples. So, this paper provides a guide for exploration of landslide dams and dammed lakes.
1998, 6(3): 253-257.
The concept of hydraulic effects of preferred planes is elaborated in this paper, and its influence on Xinzhai landlside stability factor is emphantically analyzed.
The concept of hydraulic effects of preferred planes is elaborated in this paper, and its influence on Xinzhai landlside stability factor is emphantically analyzed.
1998, 6(3): 258-263.
Based on the theory of soomthing, filting, and parameter estimating in modern cybernetics, the mothed of nonlinear system indentification of landside is studied, and its application prospect is also discussed.
Based on the theory of soomthing, filting, and parameter estimating in modern cybernetics, the mothed of nonlinear system indentification of landside is studied, and its application prospect is also discussed.
1998, 6(3): 264-268.
Expansive clay soils swell when wetered and shrink when dried out, and hence give rise to ground movements which can further cause structural damages of buildings. The effects of initial water content and load applying or releasing on the result of laboratory swell shrink indices test are studied. The influence of site conditions on potential volume of an expansive clay foundation, especially these factors causing significant change in water content of underlying soil mass, are discussed in this paper. Instead of natural water content, shrinkage limit and swelling limit should be used as initial water content in laboratory test. Before foundation design, site conditions, such as vegetation, precipitation, groundwater table, water drainage, etc. must be considered carefully. For important structures, different methods should be used and compared with each other to evaluate potential volume change of expansive soil more reasonably.
Expansive clay soils swell when wetered and shrink when dried out, and hence give rise to ground movements which can further cause structural damages of buildings. The effects of initial water content and load applying or releasing on the result of laboratory swell shrink indices test are studied. The influence of site conditions on potential volume of an expansive clay foundation, especially these factors causing significant change in water content of underlying soil mass, are discussed in this paper. Instead of natural water content, shrinkage limit and swelling limit should be used as initial water content in laboratory test. Before foundation design, site conditions, such as vegetation, precipitation, groundwater table, water drainage, etc. must be considered carefully. For important structures, different methods should be used and compared with each other to evaluate potential volume change of expansive soil more reasonably.
1998, 6(3): 269-274.
Condition of geoenvironment on the new city and objective of prejudge evaluation and constitutions of environment factors are system analyzed. Bases on this, the sensitive factor model of synthetic evaluation is chosen to evaluate prejudge quality of geoenvironment of the new city, result of evalution is analyzed, steps of system and control of between build of new city and geoenvironment are put forward.
Condition of geoenvironment on the new city and objective of prejudge evaluation and constitutions of environment factors are system analyzed. Bases on this, the sensitive factor model of synthetic evaluation is chosen to evaluate prejudge quality of geoenvironment of the new city, result of evalution is analyzed, steps of system and control of between build of new city and geoenvironment are put forward.
1998, 6(3): 275-281.
Rock mass stability on the west out slope of upper reservoir is one of the main geological engineering problems for Ming Tombs Pumping Storage Station. Since there exist several gently dip angle faults which incline to outside of the reservoir and bad rock mass structure, there is possibility of slide displacement and deformation instability, which may potentialy threatene the safe operation of the station. So it is necessary to analyze the rock mass stability on the west out slope and to make engineering reinforce treatment.
Rock mass stability on the west out slope of upper reservoir is one of the main geological engineering problems for Ming Tombs Pumping Storage Station. Since there exist several gently dip angle faults which incline to outside of the reservoir and bad rock mass structure, there is possibility of slide displacement and deformation instability, which may potentialy threatene the safe operation of the station. So it is necessary to analyze the rock mass stability on the west out slope and to make engineering reinforce treatment.
1998, 6(3): 282-288.
This paper explains how to use GPS technique to monitor the slope deformation in Jinchuan open pit mine. The authors introduce the conditions of mine simply. The main topic is how to choose the monitoring basic points; how to measure WGS 84 coordinate of the basic points; how to lay out the network for deformation observation; to collect GPS data, to deal with the result and its quality; and how to carry out the conversion of coordinate system, etc. Diplacements of some four order triangulation points and other control points have been back calculated from GPS observation data. These results are fit for an explanation of the physical properties deformation. Finally, the authors point out that the GPS technique has certain advantages for the mine field measurement.
This paper explains how to use GPS technique to monitor the slope deformation in Jinchuan open pit mine. The authors introduce the conditions of mine simply. The main topic is how to choose the monitoring basic points; how to measure WGS 84 coordinate of the basic points; how to lay out the network for deformation observation; to collect GPS data, to deal with the result and its quality; and how to carry out the conversion of coordinate system, etc. Diplacements of some four order triangulation points and other control points have been back calculated from GPS observation data. These results are fit for an explanation of the physical properties deformation. Finally, the authors point out that the GPS technique has certain advantages for the mine field measurement.
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