Study On Computing Method And Application In Project Of Piles With Anchor Cables

Landslide is a kind of geologic disaster that always occurs and make great hazard, so the research of landslide prevention is always get great attention. Many kinds of the landslide prevention get great development recently. About all the application of anti-sliding piles is most widespread. Anti-slide piles with pre-stressed anchor is a kind of new sustentation structure as the application of anchor on project, according to regular anti-sliding piles its stress is more rational, it could control piles' body displacement and corresponding stress distribution effectively, therefore it gets widespread application after appeared. But its design theory research is great lag to the project application, and its design lacks corresponding standard instruction, has some questions which are urgently to be solved. This article is to develop those questions base on Danba landslide.This article establishes corresponding mechanics and mathematical models bases on the physical model, finally obtains the analytic solution of the anti-slide piles endogenic force, and establishes foundation for the structural design.Firstly, the article study on the anti-slide piles' theory, including landslide thrust computation, its transmission mechanism between anti-slide piles, as well as the mutual function of piles and soil body; Secondly, do research on the structural design principle of anti-slide piles with pre-stressed anchor; Finally, base on the project example, establishes corresponding computational procedure according to the computational method and design theory which introduced this article and puts it to the practice.Base on the research, this article gets the following results:1. Thrust transmits between the anti-slide piles may form the soil arching under the certain condition, the span of soil arching is the main factor of the distance of piles, besides the thrust of landslide, the span of soil arching is also related to the landslide'sφand c, this article has carried on discussion on those relations.2. Base on the elastic foundation beam theory, combine to the elastic formula, makes analogy with ground additional stress of uniformly distribute load, and has obtained the analytic solution formula of soil displacement beside piles.3. Do research on the mechanics model of anti-slide piles with pre-stressed anchor, and introduce the finite difference method, consider the several center restraints situations of piles' bottom, get computational methods of anti-slide piles with pre-stressed anchor separately.4. When the design and construction of anti-slide piles with pre-stressed anchor applies to concrete project, adjust the space between multi-platoons anchors according to certain location situation and the project request, and get the optimally space. The anchor endogenous force of previous row is smaller than the lower row, so it could suitably reduce the prestress of previous row when design.