【作者】 王波；

【导师】 龚文惠；

【作者基本信息】 华中科技大学 ， 建筑与土木工程， 2016， 硕士

【摘要】 我国是滑坡灾害多发地区,每年因滑坡灾害造成了巨大损失,因此一直以来边坡的稳定性分析和安全治理都是岩土工程界的重大课题。在滑坡治理中,锚杆支护技术是一种常用的加固技术,然而对锚杆支护边坡稳定性的理论研究还很不成熟。本文采用三维极限平衡法和数值模拟方法分析锚杆支护边坡稳定性。本文以钟家湾深路堑边坡为工程背景,研究了锚杆支护边坡的稳定性。在前人研究的基础上,总结和阐述了边坡工程中锚杆的荷载传递机理和锚杆加固作用机理,探索了三维极限平衡法和数值模拟作为锚杆支护边坡的稳定性分析方法;在收集整理了钟家湾路堑边坡的工程地质勘测数据的基础上,通过参数反演确定了边坡计算参数;利用ANSYS前处理功能与FLAC3D的接口建立自然边坡模型,计算该边坡安全系数,然后结合三维极限平衡法的计算结果评价边坡稳定性;依据评价结果和锚杆作用理论设计了锚杆支护方案,在充分考虑锚杆作用的情况下运用三维极限平衡法和数值模拟方法对边坡进行稳定性分析和评价;分析了锚杆参数对锚杆支护边坡稳定性的影响。分析表明,边坡破坏从坡脚前缘临空结构面开始发展,在结构面上主要为剪切破坏,直至坡顶后缘产生拉—剪破坏,最终形成从坡脚到坡顶后缘的贯通塑性区;在锚杆支护边坡中,锚杆穿透结构面形成受力系统,边坡内部应力重分布后集中于锚杆附近,从而提高了边坡稳定性;锚杆承载力越大边坡稳定性越高,倾角越大稳定性越低,间距越大稳定性越低。更多还原

【Abstract】 The frequent occurrence of landslide in China causes great loses every year.Therefore, stability analysis and safety management of slope have always been major issues in geotechnical engineering and anchors are commonly used in landslide control project. However, the theoretical research on the stability of anchoring slope is still unmature. In this thesis, numerical simulation and three-dimensional limit equilibrium method were applied in stability analysis of the anchoring slope.The slope stability analysis was based on the Zhongjiawan deep cut slope in this thesis. Anchor load transfer mechanism and strengthening mechanism in anchoring slope was summarized with combination of the three-dimensional limit equilibrium method and numerical simulation. With the foundation of engineering geological data of Zhongjiawan deep cut slope, the slope calculation parameters was determined by parameter inversion.The numerical model which was used to calculate safety factor of the slope was established by pre-processing function of ANSYS and FLAC3 D. And slope stability was evaluated combined with the calculation results of three-dimensional limit equilibrium method. Anchor support scheme was designed on basis of evaluate results and anchor action mechanism and anchoring slope stability was evaluated. The influence of anchor parameters on the anchoring slope stability was analyzed.This thesis demonstrates that the failure began from the structural plane, in which the main destruction is shear failure, at slope toe before the tension-shear failure was formed at the slope top and eventually the plastic-zone arose in the slope. It is illustrated that anchors which penetrated structure surface formed a force system, and resulted in redistribution of internal stress which concentrated near the anchors, so that the security was improved. It is concluded that the higher the anchor bearing capacity the greater slope stability, and the higher the anchor inclination angle the lower slope stability, and the higher the anchor spacing the lower slope stability.更多还原