隐伏地裂缝扩展的大型原位浸水试验研究  

LARGE-SCALE IN-SITU SUBMERGING EXPERIMENT ON BURIED GROUND-FISSURES EXPANSION

作　　者：汪丽 李新生[2] 李同录[2] WANG Li;LI Xinsheng;LI Tonglu(School of Energy and Architecture, Xi' an aerotechnical college, Xi' an 710077, Shannxi, China;School of Geological and Surveying Engineering, Chang' an university, Xi' an 710054, Shannxi, China)

机构地区：[1]西安航空学院能源与建筑学院,陕西西安710077 [2]长安大学地质工程与测绘学院,陕西西安710054

出　　处：《地质力学学报》2019年第3期412-420,共9页Journal of Geomechanics

基　　金：国家自然科学基金项目(41772278);校级自然科学基金资助项目(2018KY1115)

摘　　要：隐伏构造地裂缝具有潜在的灾害效应和扩展的随机性,地表水是诱发隐伏地裂缝扩展的因素之一。文章基于野外调查资料,定性分析了地表水对隐伏地裂缝扩展效应的水压作用及黄土湿陷作用机理,在此基础上选取西安曲江新区隐伏地裂缝黄土场地开展了大型原位现场浸水模拟试验。通过沉降观测、数据分析和数值模拟,得出水压作用是诱发隐伏裂缝扩展的辅助因素,因黄土湿陷作用在裂缝两侧形成的差异沉降是主要诱因,靠近隐伏地裂缝的区域沉降量最大,距离裂缝越远沉降量越小,整体呈现抛物线形的沉降模式,验证了地表水诱发浅表层黄土隐伏裂缝扩展的作用机理。相关认识对于研究隐伏构造地裂缝的扩展机理以及防治工作具有重要的指导意义。Buried ground-fissrues have the potential disaster effects and the randomness of expansion, and surface water is one of the factors that induce the expansion of buried ground-fissrues.Based on field investigation data, two main expansion mechanisms, hydraulic pressure and the loess collapsibility, were qualitatively analyzed.On the basis of this theory, a buried ground-fissures site in Xi' an loess area of Qujiang New District was selected to simulate surface water submerging the ground-fissures.Through the settlement observation, data analysis and numerical simulation, it is concluded that hydraulic pressure is the auxiliary factor that induce the expansion of the buried ground-fissrues, while the differential settlement caused by loess collapsibility on both sides of the ground-fissrues is the main cause.The regional settlement near the buried ground-fissrues is the largest, and the further away from the fissure, the smaller the settlement is.The settlement curve takes on a parabolic pattern, which affirms the ground-fissuers expansion mechanism induced by surface water in shallow loess area.Relevant studies have important significance that will guide us to reveal the expansion mechanism of buried ground-fissures and to control the expansion.

关 键 词：地裂缝 地表水 隐伏构造 扩展机理 浸水试验 

分 类 号：P642.2[天文地球—工程地质学]