Study On The Stability Of Landslide At Reservoir Banks Of Wuqiangxi Reservoir And Information System

The safety problem is the most important thing in highway construction. The slipping safety problem is the main subject for study, but seldom studies have been done on the landslide in reservoir area. In the present paper, the stabilty characteristic of slope group in reservoir area and its monitoring information system are taken as the study subject, with the funding of the project "Study on the soft rock slope stability with serious heavy rainfall". The studies are done by four methods: insitu-investigation, laboratory test, analytical analysis, and numerical simulation. The main contents and result are as following,(1) The insitu-investigation is taken to analyze the distribution and mechanism of reservoir slope groups, falling accumulation, and deformation body. The discipline for these slope occurring is studied, the slides at the reservoir areas are divided into different types. Type and characteristic of the reservoir slides deformation are studied as well as the induced factors, the falling accumulation active characteristic is analyzed. The stability evaluation is done to the falling slope and foundation deformation to predict the reservoir slides.(2) The strength parameters are estimated to the shear characteristic and weak interlayer of the slide soil, showing that, with increase of the shear velocity, the residual friction angle increase gradually, the residual shear strength of the slide soil has the positive effect. With increase of the water content, the strength of the interlayer increases as well, the decrease of the water content will lead to the increase of the friction angle and cohesion. With increase of the dry density, the friction coefficient, cohesion of the interlayer will increase correspondingly. If the grain of the soil remains the same value, the strength of the interlayer will influenced by its own density.(3) One landslide in reservoir area is chosen as the background engineering. According to the saturated-unsaturated seepage equation, the dynamic response of pore water pressure in the landslide by the fluctuation of water level is studied when considering the infiltration characteristic and fluctuation velocity of water level, the analysis results show that,(1) when the water level fluctuates, the saturated permeability coefficient has great impact on the initial water level under the same infiltration condition; with the increasing of the saturated permeability coefficient, the water level becomes lower with more smooth shape, which has smaller impact on the dynamic and static pore water pressure, and good to the stability of slope;(2) with the increasing of fluctuation velocity of water level, the response of water level lag behind, while the shape of water level becomes steeper, which cause greater dynamic pore water pressure to the slope, and worse to the stability of slope.(4) One reservoir slope is taken as the study background, the slope stability with different engineering condition and loading conditions is studied as well as the influential factor, the whole stability and local stability of the reservoir slope are analyzed to build the relationship among factor of safety of slope with the influential factors like, horizontal seismic force(q), water height at the behind joint(Hi), the height of the underground(H2), and the shear strength parameters (f and c). The results show that, if the water is not storage in the reservoir, a) the whole stability of the high slope is great influence by the horizontal seismic force(q), especially if q<0.3, whole has close relationship; b) under the condition of heavy raining, the water height at the behind joint(H1) has smaller impact on the stability of the high slope; c) the whole stability is great influenced by the internal friction coefficient f, while cohesion c has little impact. If the water is storage, the k value is obvious lower than the condition with storage of water in reservoir, so the storage of water has great impact on the stability of slope.(5) The relationship of the factor of safety of upper slope and the corresponding influential factors shows that, the most influential factor to the stability of upper slope is the water height at the behind joint(H1), while the other influential factors contains the horizontal seismic force(q), and friction coefficient f, while the factors has little impact is cohesion c of the slide plane. The deformation failure and stability of the rock mass at shallow place of slope are analyzed, to divide the deformation failure into4types, including, slip deformation, trip deformation, and falling deformation. The deformation failure of the rock mass at shallow place of slope is formed from the surface of slope to the internal, then lead to the failure mode of each layer.(6) Slides and falling accumulation and deformation body are taken as the study background, the disaster information management system at the reservoir slides is founded under the support of the information system theory and computer techniques according to the real situation of the reservoir areas. a) the slide information system is founded based on the GIS, the whole design to the platform is finished, including structure design to the hardware and software platform; b) the criterion of the geological disaster of the reservoir slides are proposed to make sure the standardization of operation; c)the database management is developed based on the criterion of the geological disaster; d) the subsystem is developed for the disaster data.