The Research On Fundus Ladder Technology Of Fill Slop Considering The Effect Of Precipitation Infiltration

With the development of the national economy and west China development drive, There are more and more fill slope engineering of railway, highway, mine, water conservation, and its scale becomes larger and larger, the support of them become more and more difficult. Large gliding thrust force and differential support conditons are characteristic of this kind of slope engineering, and traditional slope supporting method is difficult to manage and expensive.So it is need to do some studies in fill slope, and to explore supporting method to meet the needs of fill slope.In this paper, the inherent characteristics of the fundus ladder technology for fill slope has been specialized studied. The fundus ladder technology is a kind of aiding method to enhance the slope stability, which is derived from many original methods.To integrate supporting method, the new supporting technique of fill slope is formed, which has the features of higher stability and economical construction cost, which has change the original supporting method to meet the needs of the development of fill slope.This paper is based on the wreck features of fill slope and the major factors whic influence the stability of fill slope, and to analyze the cause of land slide along with basal surface. Along with the soil water infiltration to influence the fine grain material infiltration move, the aquitard is formed with certain thickness between filling-up soil and the stable basement. The shear strength of this layer is obviously lower than the filling-up soil. Based on the existence of aquiclude, a calculation model about the fundus ladder of anti-sliding c,? can be built, the control threshold value calculation method of excavation of the fundus steps can be made.On this basis, a numerical simulation of fill slope with MADIS / GTS finite element program is made,which mostly validated the analytics correctly . And stability influence is studied while the fill slope with different step width, inclination angle and the step range.Considering the infiltration and the move of the fine-grained material is the precondition of forming the aquiclude, and rainfall is the most important and general environment of resulting in the slope failure.In this paper, considering the rainfall infiltration and matric suction, according the different duration and strength of rainfall which impact the stability of fill slope, analyzing the fundus ladder method by fluid-mechanical Interaction, some benefit conclusion can be made. Finally, the design contrast is carried on the Chongqing San Hui gangue rocky mountain project, and a good effect is achieved. The analysis has indicated that the fundus ladder technology is economy ,and at the circumstance of assuring stability, Materials was saved, the blasting difficulty was reduced, and the project cost was reduced. It possesses a very good economic benefit.The establishment of calculation model provides a reliable theoretical basis for fundus ladder method. And it became a new method of design and fundus ladder technology. It has the certain theory and the practical value.