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探讨水利、交通等领域挡土墙设计规范中对抗滑稳定安全系数规定的允许值的合理性,认为其相应值与国外相关规定相比偏小。从理论上分析,使用抗力除以土压力的安全系数定义计算土压力相应的强度参数是标准值,而非经分项系数或安全系数折减后的标准值,其允许安全系数宜大于边坡等同类土方构筑物的相应值。认为建立在可靠度理论指导下的分项系数方法可以从根本上摆脱在安全判据方面存在的缺陷。在假定一级建筑物的允许可靠指标为3.7、土的黏聚力和摩擦系数变异系数分别为0.2和0.1的条件下,对一个特定的算例,填土的黏聚力、摩擦系数和基底的摩擦系数分项系数标定值分别为y_c=1.301,y_f=1.209和y_(fo)=1.170,应用提出的相对安全率判据,可以发现上述的分项系数标定值具有普适意义。该成果可以为相关规范的制订提供参考。
This paper discusses the rationality of the allowable value of the safety factor of anti-skid stability in the design code of retaining walls in the fields of water conservancy, traffic and other fields and considers that the corresponding value is smaller than the relevant regulations in foreign countries. It is theoretically analyzed that the corresponding strength parameter for calculating earth pressure is defined as the safety factor defined by the resistance divided by the earth pressure instead of the standard value reduced by the partial factor or the safety factor and the allowable safety factor should be larger than the slope Equivalent value of earth structures. It is considered that the sub-coefficient method based on the theory of reliability can fundamentally get rid of the defects in the safety criterion. Under the assumption that the allowable reliability index of a building is 3.7 and the coefficient of variation of cohesion and friction coefficient of soil are 0.2 and 0.1 respectively, for a specific example, the cohesion, friction coefficient and substrate The coefficient of partial coefficients of the friction coefficients are y_c = 1.301, y_f = 1.209 and y_ (fo) = 1.170, respectively. The proposed relative safety ratio criterion shows that the calibration values of the partial coefficients mentioned above have universal meanings. The results can provide reference for the formulation of relevant norms.