| In this paper,slope of Labagou is located in intellectual village of Jiang Pu Township which is in the southwest of Sichuan Province.Liangshan Yi Autonomous Prefecture is in the southern,Panxi Resources Development Zone is in the center,Panzhihua is in the west and in the south,it is adjacent to Kunming and Chuxiong of Yunnan Province.Slope of Labagou is between East longitude 102°14'17.02 " and 102°14'39.88",north latitude 26°13'51.83 " and 26°14'11.48",belonging to Liangshan state,Sichuan Province.The total area of the slope is about 15.8 million square meters.This paper takes Labagou slope in Sichuan province as the background,studying the engineering geological conditions of the slope in detail from these five areas,such as the topography,stratigraphic lithology,geological structure and earthquake,meteorological and hydrogeological conditions and human engineering activities,combined with field geological and engineering survey.Combine with the mechanism of landslide and expert scoring and screen out a relative important impactive factor.Then use MATLAB to calculate the weight of each impactive factor and combine with mathematical knowledge in order to obtain the comprehensive weight value of each impactive factor,for example,the comprehensive weight of building irrigation channel and houses is 0.1304,the rainfall is 0.2667 and the earthquake is 0.1911.And thus develop the natural conditions,continuous rainfall conditions and the earthquake conditions.According to the proposed natural conditions,continuous rainfall conditions and earthquake conditions,Calculate the safety factor of the slope under these three different operating conditions respectively by using Lizheng and FLAC.As the linear surface of the landslide,therefore,when analyzing the overall stability of the landslide,we choose the transfer coefficient method.The overall slope is stable,with only three slopes being in a less stable or unstable state.So far,slope deformation is still continuing in the rainy season.And in the future rainy season,it has continued to develop the trend and may lead to slope instability.In the process of calculation,the reasonable physical and mechanical parameters are selected,and the FLAC numerical simulation is carried out.At the same time,the results are compared with the results obtained by Lizheng to ensure the reliability of the calculation.The stability coefficient of number 1 is 1.046 in the natural condition,0.999 in the continuous rainfall condition and 1.024 in the earthquake condition.The stability coefficient of number 2 is 1.051 in the natural condition,1.003 in the continuous rainfall condition and 1.026 in the earthquake condition.The stability coefficient of number 3 is 1.055 in the natural condition,1.005 in the continuous rainfall condition and 1.029 in the earthquake condition.They are in the unstable state closing to FLAC numerical simulation results.The safety factor is solved by the the limit equilibrium method which is based on the approximate solution of the stress-strain analysis.However,FLAC uses strength reduction method,which is based on the analytical solution force compartmentalization between assumptions.Although the method is not the same,the results are very close.With the help of numerical simulations,the potential slip surface of the slope can be viewed intuitively.According to the results of slope stability analysis and terrain conditions,select the angled gravity retaining wall as the support structure,and check the stability after treatment.In order to achieve the purpose of further development of prevention and control slope,set the retaining wall in the front of the slope.After checking,the design of the retaining wall meets the anti-slip and anti-overturning stability requirements.The construction of irrigation channel weight value is relatively large,so at the same time it is recommended to use the retaining wall for slope control,reasonable construction of housing and irrigation channel should also be for comprehensive management. |
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