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软土层在发生震陷过程中,厚度和孔隙比随着震动的持续会不断变化,每一次加荷后,软土层都会因为压缩而厚度减小,相应孔隙比也会减小;而且震陷量的大小与软土层的排水条件也有着密切的关系,在考虑软土层参数变化及上下相邻土层的排水条件后,利用震动固结原理,提出了震陷量的计算方法,并利用该方法对唐山沿海地区的软土层在1976年地震中的震陷量进行了计算,结果表明震陷量Ⅶ度区在27.4~111mm之间,Ⅷ度区在114~671 mm之间,Ⅸ度区在463~1315mm之间.据震后实测的地面垂直形变资料显示,沿海地区地面沉陷量Ⅶ度区一般在25~100 mm之间,Ⅷ度区一般在100~500 mm之间,Ⅸ度区一般在500~1551 mm之间.结果表明,计算结果与实测结果大致吻合.
In the process of seismic collapse, the thickness and void ratio of the soft soil layer will change continuously with the vibration. After each loading, the soft soil layer will decrease in thickness due to compression and the corresponding void ratio will decrease. The size of the trapped volume is also closely related to the drainage conditions of the soft soil layer. After considering the parameters of the soft soil layer and the drainage conditions of the upper and lower adjacent soil layers, the calculation method of the amount of collapse is proposed using the principle of vibration consolidation. The method was used to calculate the amount of seismic subsidence of the soft soil in the coastal area of Tangshan in the 1976 earthquake. The results show that the Ⅶ degree of the depression is between 27.4 ~ 111mm and the area of the Ⅷ degree is between 114 ~ 671mm , Ⅸ degree region between 463 ~ 1315mm.According to the measured vertical ground deformation data show that the coastal area ground subsidence Ⅶ degree area is generally between 25 ~ 100 mm, Ⅷ degree area is generally between 100 ~ 500 mm , Ⅸ degrees area is generally between 500 ~ 1551 mm.The results show that the calculated results and the measured results are generally consistent.