加筋高陡边坡离心模型试验与数值模拟  

Centrifugal Tests and Numerical Modeling of High and Steep Geosynthetic-reinforced Slope

作　　者：李波[1] 徐丽珊[1] 龚壁卫[1] 俞武华 

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,武汉430010 [2]中交第二航务工程勘察设计院有限公司,武汉430071

出　　处：《长江科学院院报》2014年第3期65-68,76,共5页Journal of Changjiang River Scientific Research Institute

基　　金：中央级公益性科研院所基本科研业务费项目(CKSF2013036)

摘　　要：采用离心模型试验和二维有限元法,研究加筋高陡边坡的加筋机理及其对边坡稳定性的影响.开展2组离心模型试验,逐级增大加速度直至边坡发生破坏,分析无加筋边坡与加筋边坡的变形和土压力随分级加载过程的变化规律.基于离心模型试验的基本参数,建立有限元模型,通过对比计算结果与离心模型试验结果,验证数值模型的合理性;进一步采用该数值模型开展填料强度与加筋体抗拉强度对边坡稳定性的敏感性分析.研究结果表明：加筋体的引入能够有效提高安全系数,但对沉降影响较小;无加筋边坡与加筋边坡的破坏形式不同,无加筋边坡坡肩垮塌,而加筋边坡主要在1/6～1/3边坡高度处出现应力集中.The stability of high and steep geosynthetic-reinforced slope and the reinforcement mechanism are researched through centrifugal model test and two-dimensional finite element method.Two centrifugal model tests are conducted in the purpose of exploring the failure trend or failure mode through measuring the variation of deformation and soil pressure of both unreinforced and reinforced slopes in stepped loading.Two-dimensional finite element model is established based on the fundamental parameters of the centrifuge model test.The calculation results are compared with the measured centrifugal test results to verify the rationality of the finite element model.Furthermore,the finite element model is employed to analyze the sensitivity of slope stability to the packing intensity and tensile strength of reinforced body.Results show that the geosynthetic reinforcement effectively improves the slope safety factor,but has slight influence on settlement.The failure mode of unreinforced slope differs from that of reinforced slope：collapse occurs at the unreinforced slope abutment,while stress concentrates at the 1/6-1/3 height of reinforced slope.

关 键 词：加筋边坡 离心模型试验 有限元 边坡稳定性 

分 类 号：TU472.34[建筑科学—结构工程]