堆载预压处理原料场软基的数值分析

堆载预压是软土地基常用的处理方法,砂石桩和塑料排水板可以加快超孔压的消散,对软基加固有利。采用数值模拟方法,对上海梅山钢铁公司江边码头料场在堆载过程中土体变形和孔压分布规律进行数值仿真,模拟结果表明,砂石桩的施工有利于超孔隙水压力的消散,料场的沉降值在每次加料期间变化明显,且随着堆料堆高的增加而明显增大;每级荷载初期完成的变形量基本达到本级稳定状态下的变形总量的70%以上,后期变形较缓慢,逐步收敛呈稳定状态,在满足最终堆矿荷载要求的情况下,也保证了正常运行。

Numerical Study of a Soft Ground for Raw Material Stockyard Improved by Preloading

Preloading is a common ground improvement method. The soft cohesive soils are improved by the dissipation of ex-cess pore water pressures through the wick drain or sand/stone columns. The numerical analysis is performed on the preloadingtreatment of a sofl ground for the riverside raw material stockyard of Shanghai Meishan Steel Company by using sand columnmethod. The sand column is simplified as sand wall in the numerical model. The soil deformation and the pore water pressuredistribution and development are simulated. The results indicate that the installation of the sand/gravel columns is in favorableto the dissipation of pore water pressures. Under loading stage, an obvious soft ground deformation can be found. At the endof each load stage, an approximate of 70% of the ultimate settlement can be achieved. After that, the deformation rate is slowand is approaching to a stable status. It is concluded that a safe operation can be achieved.