【摘要】 埋地管道周边地质沉降是威胁管道安全稳定运行的主要地质灾害之一。为了研究沉降灾害下埋地钢管的力学响应特征，通过自主搭建的埋地管道实验箱，开展了3组不同埋深的埋地钢管阶梯沉降实验，研究了不同埋深、沉降范围和沉降量下的土体变形和管道力学响应规律，并通过数值模拟研究了不同沉降模式下的管土相互作用差异。研究结果表明：(1)对于浅埋的埋地钢管沉降地质灾害，地表观测手段可简单直接地推断沉降灾害的发展程度，而对于大埋深的埋地钢管沉降地质灾害，建议埋地钢管附近布设土体竖向位移监测；(2)在沉降初始阶段，沉降范围和沉降量增加导致的管道力学响应增幅明显，但是随着沉降范围和沉降量的增加，管道的力学响应增幅将不断降低；(3)随着阶梯沉降下管道埋深的增加，大沉降量下的管道纵向应变增幅相较于浅埋管道将显著增大；(4)土体整体沉降相对阶梯沉降的埋地管道力学响应更剧烈，建议尽可能控制沉降区土体分区域沉降以降低管道的力学响应，确保管道安全。结论认为，实验成果丰富并完善了沉降灾害下埋地钢管力学分析领域的认识，有助于进一步完善现有的沉降灾害下埋地管道安全评估体系，对保障管道安全稳定运行具有重要意义。更多还原

【Abstract】 Geological settlement around buried pipes is one of the main geological hazards threatening pipes’ safe and smooth operation.In order to study the mechanical response behaviors of buried steel pipes under the impact of settlement hazards, this paper carries out stepped settlement experiments on three sets of buried steel pipes with different burial depths using the independently constructed experimental box of buried pipes, to study the deformation patterns of soil and the mechanical response behaviors of pipes at different burial depths, settlement ranges, and settlement amounts. In addition, the differences in the soil-pipe interaction under different settlement modes are numerically simulated. And the following research results are obtained. First, for shallowly buried steel pipes,surface observation is a simple and direct method to infer the development degree of the settlement hazard. For deep buried steel pipes,it is suggested to deploy vertical soil displacement monitoring near the buried steel pipes. Second, at the initial stage of settlement, the increase of the settlement range and amount leads to a significant increase in the mechanical response of the pipes. With the further increase of settlement range and amount, however, the increase amplitude of pipes mechanical response decreases continuously. Third,as the burial depth of the pipes under stepped settlement increases, the strain increase amplitude of the pipes under the large settlement is much larger than that of the shallowly buried pipes. Fourth, buried pipes have stronger mechanical response to the overall soil settlement than to the stepped settlement. Therefore, it is suggested to control the regional soil settlement in the settlement area as much as possible to reduce the mechanical response of pipes and ensure pipes safety. In conclusion, the experimental results enrich and improve the understandings in the field of mechanical analysis of buried steel pipes under settlement hazards and help to further improve the existing safety assessment system of buried pipes, which is of great significance to ensuring the safe and smooth operation of pipes.更多还原