单向与双向排水时饱和软黏土固结震陷的计算方法

 软粘土在地震时产生固结震陷可导致建筑物下沉、不均匀沉降和倾倒摧毁等破坏,因此研究软黏土固结震陷及其计算方法是防震减灾的重要课题。运用动力学等效应力原理,将震动固结问题在加荷期与卸荷期简化为常规固结问题,研究了单向与双向排水条件下,软黏土层在加荷与卸荷期间超静孔隙水压力的变化,提出一种相对简单的震陷量计算方法。利用天津市塘沽望海楼住宅区的有关资料进行了实例验算,该地区在双向排水条件下的平均震陷量为46.1cm,在单向排水条件下的震陷量为25.7cm,计算结果与该地区地震后的实测资料基本吻合,验证了该计算方法的可行性。

Estimation Method of Consolidation Seismic Subsidence of Saturated Soft Clayey Soil with One-side And Two-side Drainages

During earthquake disasters, the consolidation seismic subsidence of soft clayey soil in the coastal areas could cause the damages of building subsidence, collapse, and non-uniform settlement. Therefore the research on the consolidation seismic subsidence of soft clayey soil and the method for estimating seismic subsidence are the important subject. Based on the equivalent stress principle of soil dynamics, the problem of consolidation seismic subsidence on loading and unloading conditions is simplified to the general consolidation problem, and the variations of extra-static pore water pressure of soft clay in one-side and two-sides drainages are discussed. Furthermore, a relative simple method for seismic subsidence estimation is put forward and it is validated by the data collected from Wanghailou residential area of Tanggu, Tianjin. The result indicates that the seismic subsidence is 46.1 cm with two-side drainage while 25.7 cm with one-side drainage. Based on field data of the area, the seismic subsidence of silty loam area is 30 cm-40 cm with 15 cm-20 cm in silty clay region, and the largest subsidence is 60 cm. Therefore, the modeling result is consistent with field data.