软土深层调蓄排水管道长期运营累积沉降规律研究  

Laws of long-term operation accumulation settlement of deep drainage pipelines in soft soil areas

作　　者：朱麒璇 周维祥 徐柯锋 徐震 朱长根 吕玺琳[1,2] ZHU Qixuan;ZHOU Weixiang;XU Kefeng;XU Zhen;ZHU Changgen;LÜXilin(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,China;Shanghai Municipal Engineering Design and Research Institute(Group)Co.,Ltd.,Shanghai 200092,China;Shanghai Baoye Group Co.,Ltd.,Shanghai 200941,China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]上海市政工程设计研究总院(集团)有限公司,上海200092 [4]上海宝冶集团有限公司,上海200941

出　　处：《岩土工程学报》2024年第S02期231-235,共5页Chinese Journal of Geotechnical Engineering

基　　金：上海市“科技创新行动计划”项目(23692106500)。

摘　　要：深层调蓄管道因长期承受充放水循环荷载导致运营期产生较大沉降,并可能进一步引起管道泄漏、损坏等,从而影响深隧调蓄系统正常运营与环境安全。针对长期充放水循环荷载导致的软土地层管道沉降问题,采用拟静力有限元模拟得到管道满流荷载导致的地基应力分布,并基于分层总和法与软土塑性应变、孔压随加载循环累积的经验公式,提出了管道下方软土地基长期沉降的计算方法。将该法用于上海苏州河段深层调蓄管道长期沉降预测,分析得到了管底地基未加固条件下管道-地基系统长期沉降演化规律。结果表明因充放水循环荷载具有低频重载的特点,地基沉降的绝大部分由于软土的循环累积塑性应变导致,而由孔压消散引起的固结沉降几乎可以忽略。研究成果可为软土地区深隧排水系统设计和运维安全保障提供有益参考。The deep drainage pipelines experience significant settlement during operation due to the long-term cyclic loading from water filling and discharge,potentially leading to pipe leakage and damage,consequently affecting the normal operation of the deep tunnel drainage system and environmental safety.To address the settlement issue of pipelines in soft soils caused by the long-term cyclic loading from water filling and discharge,a quasi-static finite element method is employed to simulate the stress distribution in the foundation induced by full-flow loads on the pipeline.Based on the layered summation method and empirical formulas for plastic strain and pore pressure accumulation with loading cycles in soft soils,a method for calculating the long-term settlement of the soft soil foundation beneath the pipeline is proposed.This method is used to predict the long-term settlement of the deep pipelines in the Suzhou River section of Shanghai,and the evolution laws of settlement in the pipeline-foundation system under untreated conditions of the bottom foundation are analyzed.The results indicate that due to the low-frequency heavy loading characteristics of water filling and discharge cycles,the settlement induced by the cumulative plastic strain in the foundation soils accounts for the vast majority.In contrast,the consolidation settlement caused by pore pressure dissipation can be almost ignored.The research findings can provide references for the design and operation safety assurance of deep tunnel drainage systems in soft soil areas.

关 键 词：深层 排水管道 长期沉降 循环荷载 经验模型 

分 类 号：TU475[建筑科学—结构工程]