局部渗漏对盾构隧道周围水土压力分布特征的影响  

Influence of local leakage on distribution characteristics of soil and water pressure around shield tunnels

作　　者：黄昌富 逯倩倩 李鹏飞[2] 李少华 江玉生[3] Huang Changfu;Lu Qianqian;Li Pengfei;Li Shaohua;Jiang Yusheng(China Railway 15th Bureau Group Co,Lid,Shanghai 200070,China;Key Laboratory of Urban and Engineering Safety and Disaster Reduction,Ministry of Education,Bejing University of Technology,Beijing 100124,China;China University of Mining and Technology-Bejing,Beijing 100083,China)

机构地区：[1]中铁十五局集团有限公司,上海200070 [2]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124 [3]中国矿业大学(北京),北京100083

出　　处：《土木工程学报》2024年第S1期147-153,共7页China Civil Engineering Journal

基　　金：国家重点研发计划(2023YFC3806700);国家自然科学基金(51978019,52278382);北京市自然科学基金(8222004);中国施工企业管理协会青年创新项目(2023-B-028);中国铁建地下空间利用领域科研计划项目(2024-W25)。

摘　　要：在富水砂层地区,若盾构隧道出现漏水漏砂事故,隧道周围地下水会产生朝向破损口较大动水压力,进而引发地面塌陷。本文采用流固耦合的数值模拟方法,明确不同渗漏位置、地下水位高度以及开口大小影响下的隧道渗漏引起的土应力分布规律,并选取合适的数值模拟方法,得到隧道在3类因素影响下的渗流场分布规律。研究结果为:随渗漏位置下移,受扰动区域随破损口发生偏转,土体整体受扰动程度减小;地下水位升高使隧道下方土体应力变化增大,地层相同区域土体应力随破损口尺寸增大而减小;单侧渗漏导致破损口两侧各45°范围内孔压显著降低,随渗漏位置下移最大孔压值减小、下方孔压减幅增大;地层孔压随地下水位高度升高而增大,破损口越大孔压减小越显著。In the area of water-rich sand layer,if a shield tunnel experiences water and sand leakage,the groundwater around the tunnel will generate a significant dynamic water pressure towards the damaged opening,which may lead to ground collapse.In this paper,a fluid-structure coupling numerical simulation method is employed to clarify the distribution patterns of soil stress induced by tunnel leakage,considering the effects of varying leakage locations,gauge height,and opening sizes.The appropriate numerical simulation method is selected to determine the distribution characteristics of the tunnel seepage field under the influence of these types factors.The results are as follows:as the leakage position moves downward,the disturbed area shifts with the damaged opening,and the overall degree of soil disturbance decreases.An increase in gauge height leads to greater changes in soil stress beneath the tunnel,while soil stress in the same area decreases as the size of the damaged opening increases.Unilateral leakage results in a significant decrease in pore pressure within the 45°range on both sides of the damaged opening.As the leakage position lowers,the maximum pore pressure decreases,and the reduction in pore pressure below increases.Pore pressure increases with rising gauge-heights,while larger damaged openings result in a more pronounced decrease in pore pressure.

关 键 词：富水砂层 盾构隧道 局部渗漏 水土压力 离散元数值模拟 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]