上海地区由管线渗漏引发地面塌陷数值模拟研究
摘要:上海市城市道路发生的地面塌陷主要原因为浅部砂层分布区域地下排水管线渗漏引发流砂,导致地下土体流失,地表硬壳层承载力下降。将有限元和离散元二者进行耦合,从管线渗漏位置和对邻近管线影响两个方面诱发地下空洞机理进行数值模拟研究。研究结果表明,管道表面顶部局部渗漏引起地表以下土体流失量最大,底部渗漏造成的影响范围较小;管道断裂渗漏引起的地面塌陷范围比管道局部渗漏大得多,但深度较管道顶部局部渗漏引起的塌陷深度小;邻近管道埋深越大,地表以下土体流失量越大,引起塌陷影响区域范围越大,而埋深较浅时,其所受邻近渗漏管道的影响较大;在对地面塌陷进行监测与预防时,不应仅关注地表沉降变形,关注管道周边的土体变形是一种更加及时有效的方法。
Abstract:The main cause of the ground collapse in Shanghai city road is the leakage of underground drainage pipeline in the shallow sand layer distribution area,which leads to quicksand and the loss of underground soil,resulting in the decrease of surface hard shell bearing capacity.Numerical simulation of underground cavities induced by leakage of underground pipelines in consideration of different leakage positions,forms and the influence on adjacent pipeline and surrounding soil by coupling between finite element and discrete element.The results show that the local leakage at the top of the pipe surface causes the maximum soil loss,but the influence range caused by the bottom leakage is small.The ground subsidence caused by the pipe fracture leakage is much larger than that of the local leakage of the pipeline,but the depth is smaller than the local leakage at the top of the pipe.The larger the buried depth of the pipelineis,the larger the loss of soil will cause the greater the influence area of the collapse,and the smaller the buried depth,the greater its impact on the adjacent leaking pipeline.Meanwhile,when monitoring and preventing the ground subsidence,we should not only pay attention to the surface settlement and deformation,but also pay attention to the deformation of the surrounding soil around the pipeline,which is a more timely and effective method.
中文标题：
上海地区由管线渗漏引发地面塌陷数值模拟研究
Numerical Simulation of Ground Collapse Caused by Pipeline Leakage in Shanghai
作者：
付栋,蔡剑韬,张海
Fu Dong,Cai Jiantao,Zhang Hai
作者简介:付栋,女,1993年生,汉族,湖北人,硕士研究生,助理工程师,研究方向为岩土工程。E-mail:1332706378@qq.com
通讯地址：
上海地矿工程勘察有限公司, 上海 200072
ShanghaiGeological&MineralEngineeringInvestigationCo.,Ltd,Shanghai200072China
中图分类号:TU433
doi:10.3969/j.issn.1007-2993.2018.04.006
出版物：岩土工程技术
收稿日期:2018-04-19
网络出版日期:2021-07-06
关键词:地面塌陷,浅部砂层,管线渗漏,数值模拟
Key words:ground collapse,shallow sand layer,pipeline leakage,numerical simulation
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