Study Of Groundwater Influence On The ? Areaslope Stability Of A Disposal Site

The proposed low and intermediate level radioactive solid waste disposal field is in the southwest of China is very important for nuclear waste disposal field,when the location of the disposal site is determined,the geotechnicalengineering investigation begain in thelow and intermediate level radioactive solid waste disposal field and south slope.Slope excavation destroys the original structure of the slope, airport surface increases, coupled with intensive human activities, for the deformation and failure of slope.In July 18 2014~July 20 2014, the Disposal site area continuous rainfall, in July 19 th after the control of the 1#, 2# landslide instability.The complex structure of the Disposal site slope, the rock mass fracture and the formation of the landslide are loose, especially the groundwater has an important influence on the stability of the slope after rainfall.The groundwater is an important influencing factoron Disposal site slope failure, in order to as the research object, in field drilling, testing, laboratory tests and data analysis on the basis, the use of engineering geology and hydrogeology related theory, slope stability analysis principle, slope hydraulics, saturated unsaturated seepage theory, analysis of mechanism of region II of the slope of the basic characteristics, groundwater on slope zone II, under the influence of the groundwater District II slope failure mechanism.Based on the saturated unsaturated seepage theory, the finite element model of the slope is carried out, and the effect of drainage and stability under the two schemes are studied and analyzed. The main achievements of this paper are:(1)From the regional geological background, disposal field geological structure, lithology, etc. from the large scale understanding Disposal siteslope with complicated geological conditions, created a Disposal site slope under complex geological condition of slope of the basic structure.(2)Based on the geological survey of the field system, the basic characteristics of the drilling core data, acoustic wave test, the history of the excavation and the deformation of the. The rock mass structure characteristics, hydro geological structure characteristics, deformation and failure characteristics of the slope are systematically summarized.(3)The action mechanism of groundwater in the environment of saturated and unsaturated rock is studied respectively. Combined with the actual situation of the slope in Fengshan II, the paper studies the deformation and failure of the slope after excavation, the stress, the changes of the strain field and the change of groundwater in the slope after excavation.(4)Based on the deformation and failure characteristics of the slope after excavation and the change of groundwater movement, the failure mode and the deformation and failure mechanism of.(5)The use of advanced groundwater dynamic monitoring instrument, the response analysis of underground II slope in combination with the rainfall data, obtained by the rainfall in the slope, middle and posterior parts of the groundwater three different response patterns.(6)Based on the theory of saturated unsaturated seepage, combined with the actual situation of the slope and the rainfall data in Disposal site area, the finite element seepage stability analysis model. By simulating an drainage and two different drainage and drainage scheme and stability effect and analysis the main reasons of differences, and to the design construction put forward reasonable groundwater reinforcement and drainage schemes and suggestions.