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引用液化度概念定义超静孔隙水压力比发展水平,考虑液化度的时程特征,将土压力视为随着液化度的增加由固体土的动土压力逐渐过渡到粘性流体的动水压力,采用拟动力法推导了动土压力大小、作用点位置以及动土压力分布形式的理论计算方法。结果表明:与Mononobe-Okabe拟静力法和Coulomb静力理论计算结果相比,拟动力法可计算出安全经济的动土压力系数与破坏楔角;动土压力为不规则的非线性分布,液化度较小时呈上抛物线形,液化度较大时呈下抛物线形,且高液化度下,内摩擦角、墙背摩擦角以及地震波放大效应对动土压力的影响减弱。
The concept of degree of liquefaction is used to define the development level of excess pore water pressure ratio. Considering the time-history characteristics of degree of liquefaction, earth pressure is regarded as the gradual transition from the soil-moving pressure of solid soil to the hydrodynamic pressure of viscous fluid with the increase of liquefaction degree. The quasi-dynamic method deduces the theoretical calculation method of the earth pressure, the position of the action point and the earth pressure distribution. The results show that compared with the results of Mononobe-Okabe quasi-static method and Coulomb quasi-static method, the quasi-dynamic method can calculate the earth pressure coefficient and wedge angle of safety and economy. The soil earth pressure is an irregular nonlinear distribution and the degree of liquefaction Parabola was formed when the liquefaction rate was small, and parabolic shaped when the degree of liquefaction was large. Under the high degree of liquefaction, the effect of internal friction angle, friction angle of wall back and amplification effect of seismic wave on the earth pressure was weakened.