延长矿区土壤含水率对埋地天然气管道塌陷的影响研究  

Study on the Influence of Soil Moisture Content on the Collapse of Buried Natural Gas Pipelines in Yanchang Mining Area

作　　者：付晨阳 何鹏 孟祥振[1] 韩建红 梁裕如 艾昕宇 由洋 FU Chenyang;HE Peng;MENG Xiangzhen;HAN Jianhong;LIANG Yuru;AI Xinyu;YOU Yang(Natural Gas Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.)

机构地区：[1]陕西延长石油(集团)有限责任公司天然气研究院,陕西省西安市710065

出　　处：《油气田地面工程》2025年第3期22-29,35,共9页Oil-Gas Field Surface Engineering

摘　　要：延安气田位处鄂尔多斯盆地,降雨频发,受黄土地貌影响,水土流失严重,易产生滑坡及塌陷等地质灾害。通过采用FLAC^(3D)软件模拟结果与已有实验结果对比,筛选得到模拟研究中最适合黄土性质的土体本构模型为mohr-coulomb模型,进一步采用该模型模拟陕北地区不同含水率条件下埋地管道的连续塌陷过程,分析土体塌陷形貌及埋地管道上表面轴向应力的变化。研究结果表明:土体含水率超过20%时,管道上部覆土存在塌陷,上表面轴向应力释放,土体含水率越高,管道上部覆土完全掉落所需要撤离的底板越少。塌陷灾害对管道威胁最大的情况为塌陷区域管道下部完全失去支撑而管道上部覆土加载于管道。上述研究结果对加强陕北黄土地貌条件下埋地天然气管道的塌陷防护具有重要的借鉴价值,能够为现场工程技术人员有效预防降雨诱发的塌陷灾害提供参考。Yan'an Gas Field is located in Ordos Basin,with frequent rainfall and severe soil erosion due to the influence of loess landform,which is prone to geological disasters such as landslides and collapses.By comparing the simulation results using FLAC^(3D) software with existing experimental results,the Mohr-Coulomb model is selected as the most suitable soil constitutive model for loess properties in the simulation study.This model is further used to simulate the continuous collapse process of buried pipelines under different moisture content conditions in northern Shaanxi,and the soil collapse morphology and changes in axial stress on the surface of buried pipelines are analyzed.The research results indicate that when the soil moisture content exceeds 20%,there is a collapse of the overlying soil on the upper part of the pipeline,and the axial stress on the upper surface is released.The higher the soil moisture content,the fewer bottom plates need to be evacuated when the overlying soil on the upper part of the pipeline completely falls off.The most threatening situation of collapse disaster to the pipeline is that the lower part of the pipeline completely loses support and the upper part of the pipeline is loaded with soil.The above research results have important reference value for strengthening the collapse protection of buried natural gas pipelines under the loess landform condition in northern Shaanxi,and can provide reference for field engineers to effectively prevent the collapse disaster induced by rainfall.

关 键 词：本构模型 FLAC^(3D)软件 塌陷灾害 含水率 

分 类 号：TU4[建筑科学—土工工程]