长达坂沟泥石流桩板墙拦挡结构极限抗冲压数值分析

A Numerical Analysis of Long Daban Ditch Debris Flow Sheet Pile Wall Blocking Structure Ultimate Punching

近年来,中国接连发生的数次严重泥石流给人民的生命财产造成了严重损失,每年中国国土等部门均会投入大量的资金进行泥石流的治理。本文以长达坂沟泥石流灾害防治工程为背景,采用FLAC3D及理想弹塑性本构模型计算分析了长达坂沟泥石流桩板墙拦挡结构的极限抗冲压能力。通过分析计算结果得出以下结论:(1)在泥石流极限冲压下,混凝土桩板墙只是拉伸破坏,没有出现剪切破坏;(2)数值计算出的长达坂沟泥石流的桩板墙极限抗冲压力大于经验公式计算出的泥石流整体冲击压力;(3)挡板中下部和桩的中间部分拉伸破坏拉最严重,桩身最大位移发生在桩顶端;(4)桩和土体之间设置接触面和不设置接触面得出的桩板墙极限抗冲压力有一定的差距。

Debris flow is a kind of geological disasters that can cause serious disaster to the people. In China alone there are more than ten thousand,most of them distribute in steep terrain,sand,stone and other debris more trees and less area. In recent years,several serious debris flow occurred successively in our country,caused serious damage to people's lives and property. every year our homeland and other departments invest a lot of money for debris flow governance. This paper takes Long Daban Ditch debris flow disaster prevention and control project as the background. based on Fl AC3 D and ideal elastic-plasti constitutive model,to calculate limit resistance analysis on sheet pile wall structure of long da ban ditch debris flow. By analyzing the calculation results some conclusions:Under the limit of punching,concrete pile is only tensile damage,there is no shear failure; Numerical simulation of long da ban ditch sheeet pile wal limit resistance impact pressure is greater than the empirical formula to calculate the debris flow impact pressure; The middle part of the pile and the middle-lowerpart of the plate tensile failure is the most serious,the maximal displacement of pile is at the top of the pile; Set the interface between pile and soil and not set interface sheet pile wall limit resistance impact pressure has certain gap.