碎石土混合料在加筋高边坡中的应用

Application of Gravel Soil Mixture to Reinforced High Slope

以广东省广州市某产业园区加筋高边坡为研究对象,探究利用挖方碎石土混合料代替级配碎石作为填方加筋高边坡回填料的可行性。利用挖方碎石土混合料填筑加筋边坡试验段,进行现场压板载荷试验、室内大型直剪试验,获取试验段的地基承载力及填筑体碎石土混合料的抗剪强度参数。建立有限元模型,以强度折减法对加筋边坡进行稳定性安全分析。研究结果表明:随着碎石土混合料的土石质量比和碎石风化程度的减小,混合料的内摩擦角和边坡稳定性安全系数不断增大;在碎石土混合料的土石质量比不大于3∶7填筑时,其内摩擦角φ值和边坡稳定性安全系数满足设计要求。

Taking the reinforced high slope of an industrial park in Guangzhou as the research object,the feasibility of using the gravel soil mixture instead of the graded gravel as the filler-reinforced high-slope backfill was explored.The excavated gravel soil mixture was used to fill the reinforced slope test section.The field plate load test and indoor large-scale direct shear test were performed to obtain the foundation bearing capacity and shear strength parameters.The finite element model was established and the stability safety analysis of the reinforced slope was carried out by the strength reduction method.The results show that with the decrease of the soil-stone mass ratio and gravel weathering of gravel soil mixture,the internal friction angle of the mixture and the safety factor of slope stability increase.When the soil-stone mass ratio of the gravel soil mixture is not more than 3∶7,the internal friction angle φ value and the slope stability safety factor meet the design requirements.