河浜管道管土相互作用及差异沉降分析

Pipe soil Interaction Mechanism Responses of Channel buried Pile in Rivers or Creeks

摘要:

基于ABAQUS有限元软件建立并验证了考虑河浜与非河浜地基接触、管土接触的交通荷载土基结构埋地管道三维有限元模型.利用该模型分析了埋地管道在不同地基处理方案下的管道竖向土压力、侧向土压力及管道内部应力，并采用分层总和法与有限元相结合的方法计算河浜地区管道存在情况下土基顶面差异沉降，结果表明，在交通荷载作用下，管道结构最大土压力出现在管顶、管侧及管底位置；交通荷载和土体自重荷载引起的管道Mises应力不容忽视，在河浜土基不处理的情况下，其最大值达4.887 MPa；在管顶（底）处存在由于管土相对刚度差异带来的土压力集中现象，其值分别是天然土基同等深处的土压力的2.61和2.99倍，分层总和法无法考虑管土相互作用导致的结果失真，有限元和分层总和法相结合的计算结果与实际情况较为吻合.

Abstract:

Based on ABAQUS software, a 3 D finite element model containing the contact problems of rivers or creeks and soil as well as pipe soil was established to analyze the mechanics on mechanism responses of buried piles. Behavior of the pipe vertical soil pressure,lateral earth pressure and pipe stress were evaluated in detail with respect to varied foundation treatment. And the behavior of the top soils difference settlement was evaluated by layer wise summation and finite element method(FEM). The results indicate that the max soil pressure on pipe top, bottom and side of pipe occurs when vehicle load is on the top. The Mises stress, which can reach up to 4.887 MPa, can’t be neglected. Layer wise summation can’t be calculated precisely for the soil pressure concentration phenomenon caused by pipeclay relative stiffness is not taken into consideration. And the problem can be solved by a combination of FEM with layer wise summation method.