Study On Design Method Of Deeply Buried Piles Stabilizing Slides And Large Scaled Model Tests

To start with the applicability of deeply buried piles stabilizing slopes, design method on deeply buried piles stabilizing slopes was put forward. Series of large scaled physical model tests were carried out to study the mechanism on slopes stabilization by deeply buried piles. Main research developments are as follows.1 Principles and basic theories on limit analysis method of finite element were systematically generalized. Then the finite element method by strength reduction was interpreted how to calculate the safety factor of slopes built up by homogeneous soil and how to search the sliding surface. It could be used to search several sliding surfaces located in slopes where some points on slope surface were constrained at different places. It could also be used to value the stability of three-dimensional slopes and rock slopes. Pile/soil interaction could be taken into account by the finite element method by strength reduction.2 The effects of various lengths and location of deeply buried piles on the stability of a slope were simulated by non-linear finite element method with shear strength reduction. Analysis was carried out to obtain the relationship between slope stability and sliding surfaces with pile location and pile length varied. The applications of deeply buried piles were restricted with the ratio of the strength of slide mass with that of slide area,the site of secondary slide surface and the length of deeply buried piles. It would lead to failure if the limitations of deeply buried piles stabilizing the slope were not taken account into in the design.3 The slope stabilized by one-row piles was simulated by non-linear finite element method with shear strength reduction. The piles were laid out at six variant sites on the slope surface, whose spacing is four meters each. Conclusions were made that the slope stability, the location and shape of the slide surface varied as pile location varies. Under the same factor of stability such as 1.15 defined by design specifications, lateral force subject to sliding and internal force of piles were calculated and compared with the results by normal method, namely limiting equilibrium. That was aimed to provide laws to select economic and appropriate...