抽水帷幕在基坑地下水控制中的应用研究

深井降水为代表的抽水帷幕技术在工程中得到逐步应用,文中结合工程实例现场试验,分析高压旋喷、压力注浆、素混凝土咬合桩等止水帷幕止水效果不足,提出了抽水帷幕方案,并进行地下水三维非稳定渗流数值模拟,模拟结果和现场止水效果均表明,在滨江地区地质条件复杂、含水层为砂砾层且分布不均条件下,抽水帷幕效果好于高压旋喷止水帷幕和液压注浆止水帷幕,推动了抽水帷幕在基坑地下水控制中的应用。

STUDY ON THE APPLICATION OF PUMPING CURTAIN IN GROUNDWATER CONTROL OF FOUNDATION PIT

The pumping curtain technology represented by deep well precipitation has been gradually applied in the engineering. Combined with the field test of an engineering example, this paper analyzes the insufficient water stop effect of high pressure rotary jet grouting, pressure grouting, plain concrete occlusal pile and so on. The pumping curtain scheme is put forward, and the numerical simulation of three-dimensional unsteady seepage of groundwater is carried out. the simulation results and the field water stop effect show that under the conditions of complex geological conditions in the riverside area, the aquifer is a gravel layer and the distribution is uneven, the effect of pumping curtain is better than that of high pressure rotary jet grouting water stop curtain and hydraulic grouting water stop curtain, which promotes the application of pumping curtain in groundwater control of foundation pit.