潜孔锤-旋挖组合钻进技术在硬岩桩基工程中的应用  

Combination of the DTH hammer with rotary drilling in hard rock pile foundation

作　　者：何正勇 李应平 HE Zhengyong;LI Yingping(Guizhou Geology and Mineral Foundation Engineering Co.Ltd.,Guiyang Guizhou 550004,China)

机构地区：[1]贵州地矿基础工程有限公司,贵州贵阳550004

出　　处：《钻探工程》2021年第12期114-119,共6页Drilling Engineering

基　　金：贵州省科学技术基金项目“岩石边坡病害风险评估模型研究”(编号:黔科合J字〔2015〕2037号)。

摘　　要：旋挖钻进技术具有经济、快捷、环保等优点,在桩基工程中得到广泛应用,但常规旋挖钻机在钻凿硬岩(抗压强度>80 MPa)时,进尺非常缓慢。为解决采用旋挖钻进技术钻凿硬岩时进尺缓慢的问题,考虑到潜孔锤具有对硬脆性岩石施工速度快的优点,探索将潜孔锤与旋挖钻机组合使用。基于官井基地滑坡治理工程中抗滑桩的施工,对潜孔锤-旋挖组合钻进成孔技术进行介绍,对其碎岩成孔机理进行分析,验证了潜孔锤-旋挖组合钻进成孔技术的可行性,可为硬岩桩基工程的施工提供有益参考。Rotary drilling technology has the advantages of low cost,high drilling rate and environmental protection,and is widely used in pile foundation engineering.However,conventional rotary drilling is very slow in drilling hard rock(compressive strength greater than 80 MPa).In order to solve the slow advance problem with rotary drilling in hard rock,and in view of high penetration rate of the DTH hammer in drilling hard and brittle rock,the combination of the DTH hammer with rotary drilling rig was explored.This paper introduces the construction process of the combined DTH hammer and rotary drilling technology with respect to the construction of anti‑slide piles in the Guanjing Base landslide treatment project,analyzes the rock breaking mechanism,and verifies the feasibility of the combined DTH hammer and rotary drilling technology.It can provide a useful reference for the construction of hard rock pile foundation projects.

关 键 词：硬岩桩基 抗滑桩 旋挖钻进 潜孔锤 

分 类 号：P634.5[天文地球—地质矿产勘探] TU473.14[天文地球—地质学]