闽江下游防洪堤堤基防渗墙施工技术

Technique of Cut off in Foundation of Dyke along the Lower Minjiang River

文章通过闽江下游防洪堤堤基垂直防渗墙工程实例,介绍了高压喷射灌注水泥浆和射水造孔浇筑水下混凝土修筑地下防渗墙的施工技术。经现场观测和取样分析,高压喷浆法成墙的渗透系数为2.36×10^(-7)—1.23×10^(-5)cm/s,射水造孔浇筑法成墙的渗透系数为3.27×10^(-8)—1.27×10^(-7)cm/s。防渗墙前后测压管水位差,分别平均为80cm和99cm。

Taking the construction of vetical impervious walls in foundation of dyke along the lower Minjiang River as a practical example, this paper briefed the method for constructing a impervious wall under ground by using a high-pressure device to inject cement paste and to make holes for backfilling with concrete. Measurement and sampling indicated the coefficients of permeability of cut off in a range of 2.36×10^(-7)—1.23×10^(-5)cm/s and 3.27×10^(-8)—1.27×10^(-7)cm/s respectively by high-pressure injecting and jeting-concretingj the difference of water level between front and back of the walls averaged 80 cm and 99 cm respectively.