土洞型地面塌陷数值模拟分析与机理研究
Numerical simulation analysis and mechanism study of soil cave type ground subsidence
薛芬芬 1谢婉丽 1王昱琛 1刘欣鹏1
作者信息
- 1. 西北大学地质学系/大陆动力学国家重点实验室/西安市黄土动力灾害防控与地质环境修复重点实验室,陕西西安 710069
- 折叠
摘要
以研究区发生的10例地面塌陷为研究对象,在野外调查的基础上结合研究区的地质环境条件和工程地质资料,分析了研究区的基础地质背景及地面塌陷的发育条件,综合归纳了研究区地面塌陷的类型,揭示了不同地面塌陷类型的诱因、时空分布特征及塌陷形成机制.最后,采用有限差分软件FLAC3D模拟了地道开挖、建房、地下水位抬升、强降雨等条件下地面塌陷的发展过程.通过对土层内部的应力应变,以及地道周围土体、地表位移等分析,揭示了研究区地面塌陷的形成机理.研究结果表明,居民建房增加上覆荷载,地下水位抬升引起洞室周围土体变形、洞室扩大,在季节性强降雨的影响下,地表会产生大的沉降.
Abstract
Ten cases of ground subsidence in the study area are taken as the research object.Based on field investigations and combined with the geological environment conditions and engineering geological data of the study area,the basic geological background and ground subsidence development conditions of the study area are obtained.Several types of ground subsidence in the study area are comprehensively summarized,and the causes,spatiotemporal distribution characteristics,and collapse formation mechanisms of different types of ground subsidence are analyzed.The finite difference software FLAC3D was used to simulate the development process of ground collapse under tunnel excavation,building houses,groundwater level rise,and heavy rain-fall conditions.The formation mechanism of ground collapse in the study area was obtained by analyzing the stress and strain inside the soil layer,as well as the displacement of the surrounding soil and surface of the tunnel.The research results indicate that the construction of residential buildings increases the overlying load,and the rise of groundwater level causes deformation of the soil around the cavern、leading to the expansion of the cavern.Under the influence of seasonal heavy rainfall,the surface undergoes significant settlement.
关键词
塌陷/机理/地下水/强降雨/数值模拟Key words
collapse/mechanism/groundwater/heavy rainfall/numerical simulation引用本文复制引用
基金项目
国家自然科学基金(42372320)
国家自然科学基金(41972292)
陕西省创新能力支撑计划(2021TD-54)
陕西省重点研发计划(2022ZDLSF06-03)
出版年
2024
NETL
NSTL
万方数据