黏土与细砂互层渗流控制的围井抽水试验研究

Research on Well Pumping Tests Based on the Seepage Control of Clay and Fine Sand Inter-beds

黏土和细砂互层地层中,采用多头小直径水泥土搅拌桩形成防渗墙体方案来进行渗流控制。首先进行防渗墙围井的工艺性试验,拟定多项试验参数和控制标准,通过对试验围井的现场抽水试验、开挖质量检查以及围井墙体水泥土的力学、渗透性能试验。依据围井的各项试验结果经分析得出:在黏土和细砂互层地层中采用多头小直径水泥土搅拌桩防渗墙来进行渗流控制的方案是可行的。同时确定了该地层中防渗墙施工过程中的各项控制参数指标。

In the clay and fine sand inter-bed,seepage control is achieved by means of forming impermeable walls by using multi-head small diameter soil cement mixing piles.First of all,some experiments are carried out on impervious walls trunk,and outline series of test parameters and control standards.According to the field tests on well pumping,and inspection on quality of excavation,as well as the mechanical experiments on the permeability of pit wall soil cements,it is feasible to control seepage by means of forming impervious wall by using multi-head small diameter soil cement mixing piles.At the same time,the control parameters used in the construction of impervious walls in such layers are determined.