施工诱发边坡失稳变形机制及应急治理对策

发布时间：2018-11-02 19:05

【摘要】：通过对香溪大道失稳边坡地质灾害调查,对边坡的地形地貌、地层岩性、岩体结构、原设计方案与施工过程进行研究,在此基础上通过FLAC3D数值模拟,结合工程地质条件分析,对原格构挡墙逆作法施工诱发边坡牵引式滑动过程进行了分析,并对其变形破坏机制进行深入探讨。研究结果表明:边坡变形受工程地质条件控制作用明显,边坡开挖改变了坡体原来的力学平衡条件,为边坡变形失稳创造了客观条件;由于超开挖施工,受格构挡墙自重作用,下部支撑岩体受压破坏,导致格构挡墙失稳下沉,带动其后坡体变形,形成牵引式滑动;随着坡体滑移的发展,边坡将逐渐拉裂破坏并形成贯通的剪切滑动面,从已施工的格构挡墙下部贯通剪出,最终整体失稳破坏;基于破坏机制分析的应急治理措施将重点放在为原格构挡墙下部提供有效支撑和控制潜在滑动面变形上;监测结果表明,应急治理后边坡达到稳定性要求。
[Abstract]:Through the investigation of the geological hazards of the unstable slope of Xiangxi Avenue, the topographic and geomorphology, stratigraphic lithology, rock mass structure, the original design scheme and the construction process of the slope are studied. On the basis of this, the numerical simulation of the slope is carried out by FLAC3D and the analysis of the engineering geological conditions is carried out. In this paper, the slope traction sliding process induced by the reverse construction of the original lattice retaining wall is analyzed, and the deformation and failure mechanism of the slope is discussed in depth. The results show that the slope deformation is obviously controlled by the engineering geological conditions and the slope excavation changes the original mechanical equilibrium conditions of the slope body and creates objective conditions for the slope deformation and instability. Because of the overexcavation construction, the gravity of the latticed retaining wall and the compression failure of the lower supporting rock mass, the latticed retaining wall is unstable and subsidence, which leads to the deformation of the subsequent slope body and forms the traction sliding. With the development of slope slippage, the slope will gradually crack and break and form a through shear slip surface, which will be cut through the lower part of the latticed retaining wall, and finally the whole instability will be destroyed. The emergency control measures based on failure mechanism analysis focus on providing effective support for the lower part of the original lattice retaining wall and controlling the potential sliding surface deformation, and the monitoring results show that the slope reaches the stability requirement after emergency treatment.
【作者单位】：长安大学地质工程与测绘学院;陕西省地矿局西安中勘工程有限公司;
【基金】：长安大学中央高校基本科研业务费专项资金项目(310826171013,310826161018) 国家自然科学基金项目(41572261)~~
【分类号】：U418.5

【相似文献】