The Analysis Of Soil Slope Stability Under Unfavorable Factors Based On Contribution Rate Method With FLAC3D

In the long history of the development of human civilization,it has been plagued by various geological disasters,among which landslide disaster has brought great losses to human beings,so the problem of slope stability has always been the object of attention and research.China is one of the countries with frequent landslides.With the enhancement of comprehensive national strength,China has achieved remarkable results in the treatment of landslide disasters.However,preventive measures are the main means to reduce the losses caused by landslides.Therefore,it is of practical significance to reasonably analyze and master which factors are more prone to landslides and more worthy of consuming limited resources to protect slopes when consuming various resources to protect them.In recent years,with the rapid progress of science and technology and the development of numerical methods,many scholars began to try to combine computer technology with numerical methods to conduct a comprehensive and detailed analysis of slope stability.In this paper,after reading a large number of relevant materials,based on previous scholars’ research results,the contribution rate of various factors to landslides in China since this century was analyzed by using the contribution rate method.Then,combined with the finite difference software FLAC3 D,various unfavorable factors were applied to the slopes under self-weight and load and numerical simulation was carried out.The specific research contents are as follows:(1)Various methods for analyzing slope stability commonly used in current projects were analyzed and compared,and their advantages and disadvantages and application scope were summarized.(2)Using the method of contribution rate,the contribution rate of each of the three factors,namely slope angle range,induced cause and location distribution,to the landslides that have occurred in China since this century is studied.(3)Soil samples widely distributed in the area with the largest contribution rate obtained by the contribution rate method were obtained,and a series of indoor tests were carried out to measure the main parameters related to slope stability.(4)Using FLAC3 D to model the slope with soil samples,and combining with the previous results,the loss degree of safety factor and the change of sliding surface are analyzed under the action of self-weight and load without adverse factors and with adverse effects respectively.The development process of plastic zone in the process of slope instability under the action of external load and earthquake is studied.The results show that,in terms of three factors,the slopes with slope angles ranging from 20° to 25°,the slopes under the action of precipitation and earthquake,and the slopes distributed in southwest China have the largest contribution rates.The soil sample belongs to well-graded cohesive soil,and its particle relative density is 2.73,cohesion is 47.8k Pa,and internal friction angle is 16.70°.The influence of the most unfavorable factors on the loss of safety factor is limited by precipitation,obvious by load,and significant by earthquake.