超载工况下固化土回填对埋地管道的变形调控机制研究

Research on Deformation Control Mechanism of Stabilized Soil Backfill for Buried Pipelines under Overload Conditions

摘要:

施工区土体在超载条件下产生的过大沉降，会导致埋地管道变形超限甚至破坏。采用固化土回填方式可以有效地控制地下埋管变形。为分析地面车辆超载对固化土回填前后地下埋管应力变形的影响，分别建立固化前后三维实体模型，分析土体固化回填前后埋管竖向变形、横向变形、轴向变形与对应应力情况。结果表明：埋管变形主要表现在竖向，原状土工况下，地下埋管整体沉降和局部沉降均较大，变形量最大达27.6 mm，应力超过安全标准；土体固化回填后可有效避免埋管出现应力集中现象，埋管变形控制效果明显，最大应力在安全许用范围内。

Abstract:

Excessive settlement of soil in the construction zone under overload conditions can lead to deformation exceeding design limits or even failure of buried pipelines. The application of stabilized soil backfill method can effectively control the deformation of buried pipelines. To analyze the impact of ground vehicle overload on stress and deformation of buried pipelines before and after stabilized soil backfill,the three-dimensional solid models before and after stabilization are established to analyze the vertical deformation,lateral deformation,axial deformation and corresponding stress conditions of the buried pipe before and after the stabilization and backfilling of the soil. The results indicate the pipeline deformation predominantly occurs in the vertical direction. Under the natural soil conditions,both the overall settlement and localized settlement of the buried pipeline are substantial,the maximum deformation reaches 27.6 mm and the stress exceeds the safety standards. After the soil is stabilized and backfilled,the stress concentration phenomenon in the buried pipe can be effectively avoided. The deformation control effect of the buried pipe is obvious,and the maximum stress is within the safe allowable range.