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目前的边坡数值分析中,大多采用理想的弹塑性模型,仅考虑强度参数进行折减,而忽略对弹性模量和泊松比的折减,导致获得的边坡安全系数比实际值要大。本文在已有的理想弹塑性模型基础上,通过室内岩土试验,测定出不同含水率下土的弹性模量和泊松比,对所建立的数值分析模型进行变模量折减。通过试验对比分析表明,通过变模量强度折减法得到的安全系数比折减强度参数法得到的安全系数小,更加接近边坡的实际的安全系数。
In the current slope numerical analysis, most of the ideal elastoplastic models are used, and only the reduction of strength parameters is considered, while the reduction of the modulus of elasticity and Poisson’s ratio is neglected. As a result, the obtained slope safety factor is larger than the actual value. Based on the existing ideal elastic-plastic model, the elastic modulus and Poisson’s ratio of soils with different moisture contents were determined by indoor geotechnical test. The numerical model was established to reduce the modulus of deformation. The comparative analysis shows that the safety factor obtained by the strength reduction method of the modulus of deformation is smaller than the safety factor obtained by the reduced strength parameter method and closer to the actual safety factor of the slope.