Research On Mechanics Effect Of H-type Anti-slide Pile In Slope Treatment

The h-type anti-slide pile is a new retaining structure which has been developingrecent years. It is a spatial structure made up of retaining rigid frame pile, that is to say,the front and back row of reinforced concrete pile, which are established in theappropriate position of the landslide sector, are joined in the head of pile with thecrossbeam. Compared with single pile and double-row pile, it has better ability ofresisting lateral deformation. The h-type anti-slide pile has been widely used recently.But the research present related to it are also few, and each kind of computation theoryis not very mature. This article uses the method, which unify the theoretical analysis, themodel experiment and the numerical simulation, and so on, to conduct systematic,thorough research to the mechanics effect of h-type anti-slide pile in slope treatment,and the paper’s main research work and the achievement includes:①Carry on seven indoor model test of h-type anti-slide pile in the article, whichhas studied stress situation of the front and back row of pile above the sliding surface inthe situation of different anchor depth and length of crossbeam. The test result indicatedthat the main load, landslide thrust force, in the h-type anti-slide pile can’t be simplyconsidered that rectangular distribution in cohesive soil, triangle distribution in sand soiland trapezoidal distribution between cohesive soil and sand soil. It can be obtained fromthe test result that the distribution form of landslide thrust force also has relations to theanchor depth and the length of crossbeam of h-type anti-slide pile.②Based on the test, utilize the general finite element analysis software ABAQUSto establish numerical model, and carry on the finite element analysis of h-typeanti-slide piles which have the same size with indoor test model. It has high goodness offit by the contrast between the analogue result and the tentative data, which confirms theestablished numerical model’s reliability. Based on this, make use of the formidablenonlinear computation ability of ABAQUS to simulate the mechanics effects of the testmodels in the situation of different inclination angle of sliding face. It has promulgatedthe relationship between the thrust force’s distribution form of landslide and theinclination angle of the sliding face, the anchor depth and the crossbeam’s length of theh-type anti-slide pile in further step, and proposed the suggested crossbeam’s length, thebest coordinated anti-slippery mechanism of the front and back piles and the horizontalthrust distribution form when the h-type anti-slide pile is in the situation of different inclination angle of sliding face.③Due to the h-type anti-slide piles of test and numerical simulation are the typewith the same anchor depth between the front and back pile, based on the preambleresearch, change the test design of the h-type anti-slide pile and set a variable θ whichmeans the angel θ between the line, being connected by the bottom of the front andback pile, and the ground. Make use of the numerical simulation to analyze themechanics effect of h-type anti-slide pile in different angel, which indicates that whenthe h-type anti-slide pile is in the condition that the front pile play the main antioxidantslippery role, and the back pile is the auxiliary one by the crossbeam, that properlyincrease the anchor depth of the front pile, which is equal to the anchor depth of theback pile, is helpful to enhance the overall skid-resisting capability of h-type anti-slidepile in landslide while the anchor depth of the back pile is fixed.