基于离心试验和数值模拟的加筋高陡边坡综合分析方法

摘要

Based on the continental reinforced slopes in some wharf engineering of Chongqing port, the reinforcement mechanism and the stability of high and steep geosynthetic-reinforced slopes under its own weight are studied through centrifuge model tests and two-dimensional finite element methods. The centrifuge test results show that the failure mode of the reinforced slope is different from that of slope without geosynthetic. The slope shoulder collapses in the former, while the stress concentrated at the 1/6~1/3 of the slope height in the latter. The strength of the fillings especially those at the middle and lower part of the slope has a decisive influence on the slope stability. If the upper fillings are changed with low strength soils alone, the stability of the slope might decrease rarely. The numerical analysis firstly is tested and verified by the centrifuge tests results, and then is applied to the analysis of the factor of safety and the stress and displacement of the prototype slope. The comprehensive analysis method with centrifuge tests and numerical simulation can be used in other reinforced slopes and geotechnical engineering projects.%以重庆港某码头工程陆域加筋边坡为原型，采用离心模型试验和数值模拟相结合的综合分析方法，研究加筋高陡边坡的加筋机理及稳定性。离心模型试验结果表明：加筋边坡与无加筋边坡的破坏模式不同，无加筋边坡坡肩垮塌，而加筋边坡在1/6~1/3边坡高度处出现应力集中；边坡填料尤其是边坡中、下部填料的强度性质对边坡的安全系数起决定性的作用，如果仅将边坡上部变为强度较低的填料，加筋边坡安全系数变化甚小。数值分析方法先进行离心模型试验验证，再用于分析计算原型加筋边坡的安全系数和应力位移场分布，保证了数值分析计算结果的正确性，研究成果为设计提供了技术支持。本研究方法可作为研究加筋边坡工程或其他岩土工程参考。