水力发电2025，Vol.51Issue(5)：37-45,9.
斜槽沟埋式回填管道变形演化与土压力计算分析
Pipe-Soil Interaction Mechanism and Calculation of Soil Pressure for Buried Backfilling of Inclined Trench
摘要
Abstract
Compared to homogeneous soil backfill,the pipe-soil interaction caused by foam concrete as local backfill material of the trench buried pipeline is not clear,and the traditional soil pressure calculation theory cannot reflect the distribution law of soil pressure due to the existence of sloping groove.To accurately obtain the distribution of soil pressure above pipe crown,the characteristics of vertical stress above the pipe along the depth direction are obtained by a series of numerical simulation.The small principal stress arc trajectory is used to describe the principal stress deflection and earth arch effect of the soil above the pipe.With the consideration of partial play of the angle of internal friction and the existence of foam concrete,the analytical solution for the vertical soil pressure of the crown is derived,and the effect of the depth of burial,diameter,internal friction angle,and base wrapping angle are discussed on the vertical soil pressure.The results demonstrate that,(a)the analytical solution can effectively characterize the nonlinear distribution of soil pressure in the arch crown area induced by various factors in the presence of inclined grooves,and additionally,the proposed method can illustrate the stress reduction effect of foamed concrete;(b)increasing burial depth,diameter,and corner angle of foundation pit all lead to a nonlinear increase in the vertical stress ratio;and(c)the vertical stress ratio stabilizes with depth,while the increase of internal friction angle significantly leads an opposite trend.关键词
斜槽沟埋式管道/管土相互作用/土拱效应/小主应力轨迹法/土压力Key words
inclined groove buried pipeline/pipe-soil interaction/soil arching effect/small principal stress trajectory method/soil stress分类
土木建筑引用本文复制引用
张江红,徐前卫,余航飞..斜槽沟埋式回填管道变形演化与土压力计算分析[J].水力发电,2025,51(5):37-45,9.基金项目
国家重点研发计划(2023YFC3009401) （2023YFC3009401）
