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本文建立了砂土在振动能量下的体积变化和孔隙水压力生长的新型本构关系。鉴于砂土的非线性振动反应和多因素的影响,文中采用了内缓变理论(Endochronic Theory)将本构关系表达为单一的内缓变量(软化参数)的函数。 试验证明在基于建议的本构关系计算的孔隙水压力值与相应的振动能量下,福建标准砂试样中产生的孔隙水压力很接近。同时又根据该本构关系预估了实际地震能量下饱水砂层中孔隙水压力的反应,回判地震液化势,获得了较满意的结果,具有一定的实用性。
This paper establishes a new constitutive relationship between the volume change of sand and the growth of pore water pressure under vibrational energy. In view of the nonlinear vibration response of sand and the influence of many factors, this paper uses the Endochronic Theory to express the constitutive relation as a function of a single slow variable (softening parameter). Experiments have shown that the pore water pressure generated in Fujian standard sand samples is very close to the pore water pressure value calculated based on the proposed constitutive relation and the corresponding vibration energy. At the same time, according to this constitutive relation, the reaction of pore water pressure in the saturated sand layer under actual seismic energy was predicted, and the seismic liquefaction potential was judged back. A satisfactory result was obtained and it has certain practicality.