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

作　　者：张江红 徐前卫[2] 余航飞 ZHANG Jianghong;XU Qianwei;YU Hangfei(Anhui Survey&Design Institute of Water Resources&Hydropower Co.,Ltd.,Hefei 230088,Anhui,China;Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 201804,China)

机构地区：[1]安徽省水利水电勘测设计研究总院股份有限公司,安徽合肥230088 [2]同济大学道路与交通工程教育部重点实验室,上海201804

出　　处：《水力发电》2025年第5期37-45,共9页Water Power

基　　金：国家重点研发计划(2023YFC3009401)。

摘　　要：相较于均质土回填,泡沫混凝土作为沟埋式管道局部回填材料导致的管土相互作用并不明晰,并且由于斜槽的存在,使得传统土压力计算理论不能反映土压力的分布规律。为了准确获取拱顶上方土压力的分布形式,基于数值模拟获取了管道上方沿深度方向的土压力特征,采用小主应力圆弧轨迹法描述管道上方的土体的主应力偏转和土拱效应,推导了考虑内摩擦角部分发挥和泡沫混凝土存在下拱顶竖向土压力解析解,最后分析了埋深、直径、内摩擦角以及基底包角等因素的影响。结果表明:解析解可以合理反映斜槽存在下拱顶区域多因素诱导的非线性土压力分布形式,并且可以呈现发泡混凝土的减载效应;埋深、直径以及基坑包角的增加均会导致竖向应力比非线性增加;竖向应力比沿深度方向趋于稳定,而内摩擦角的增加使得竖向应力比整体大幅度降低。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 

分 类 号：TU432[建筑科学—岩土工程]