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在震动荷载作用下,土特别是饱和松散砂土、粉土,土中超空隙水压力逐渐累积,有效应力下降,当孔隙水压力累积至总应力,有效应力为零,土粒出于悬浮状态,表现出类似于水的性质而完全丧失其抗剪强度,即为土的震动液化。在工民建及道路桥梁工程中经常遇到这种情况;并不是所有的饱和砂土、低塑性粘性土、粉土等在地震时都会发生液化现象,因此必须充分了解液化的判别,在此基础上对液化地基采取合理的处理措施;确保工程的安全经济。
Under the action of vibration load, the water pressure of super-voids in soil, especially saturated loose sand, silt and soil gradually accumulates, effective stress decreases. When the pore water pressure accumulates to the total stress, the effective stress is zero and the soil particles are in a suspended state, Showing a water-like nature that completely loses its shear strength, ie liquefaction of the soil. This is often encountered in engineering and civil engineering and road and bridge engineering; not all saturated sand, low plasticity clayey soils and silt will liquefy during earthquakes, so the discrimination of liquefaction must be fully understood Based on the liquefaction of the ground to take reasonable treatment measures to ensure the safety of the project economy.