求翻译：影响重力式挡土墙土压力的主要随机变量是墙后填土的重度γ、填土内摩擦角ψ、粘聚力c、土对挡土墙基底的摩擦系数μ且这四个随机变量一般都服从正态分布。如图1所示的重力式挡土墙模型（墙背竖直光滑）由均值一次二阶矩法计算抗倾覆和抗滑移的稳定可靠度分别为 ， 的计算公式如下：是什么意思？

Gravity retaining wall earth pressure random variable is re-filling wall friction angle ψ γ, filling within the cohesion c, friction coefficient μ of soil retaining walls in the basement and the four random variables are generally have to obey the normal distribution. Figure 1 shows the gravity reta

Gravity effects of the pressure-retaining walls and is primarily random variables after Wall filling heavy gamma, and filling the friction angle should be cohesive, C, and the base of the retaining walls and the coefficient of friction µ4 random variables in general are subject to normal distributio

After the influence gravity type bulkhead earth pressure main random variable is the wall the earth fill specific weight gamma, the earth fill angle of internal friction psi, cohesive force c, the earth mu also these four random variables all obeys the normal distribution generally to the bulkhead b

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