潜喷注浆桩在复杂地层截水帷幕中的设计与应用

Design and application of down-the-hole jet grouting piles in water-cutoff of complex formation

随着城市化建设的快速发展,水资源日益匮乏,各类工程项目开始广泛采用截水帷幕这种地下水控制方法。但在填海抛石层、泥卵石入灰岩地层、砂卵石层、巨厚砂层等复杂地层中,地下连续墙、咬合桩、深层搅拌桩、高压旋喷桩、高压注浆等截水帷幕施工工艺,要么造价较高,要么施工困难或者截水效果较差。本文通过一系列工程案例,介绍一种新的截水帷幕工艺--潜孔冲击高压喷射注浆桩工艺在各种复杂地层中截水的成功应用,并对其工艺的机理进行研究和分析。通过工程实践,证明其可行性及实用性,对今后类似工程具有较好的借鉴作用。

With the rapid development of urbanization and the shortage of water resources,waterproof curtain which is one of the groundwater control methods,is being widely used in various engineering projects.However,in complex strata such as reclaimed riprap layer,mud-pebble embedded into limestone layer,sand pebble layer and huge thick sand layer,construction techniques of waterproof curtain such as underground diaphragm wall,secant pile wall,deep mixing method,high-pressure rotary jet grouting and high-pressure grouting method have many challenges of high construction cost and unsatified water proof effect.Through a series of engineering cases,this paper introduces the mechanism and application of a new waterproof curtain technique,the down-the-hole(DTH)impact high-pressure jet grouting pile method in various complex situations.Through application,this construction technique is proved to be feasible and practicable,which can be used as a reference for similar projects.