砂卵石地层隧道深孔预注浆试验研究  

Study on Deep-hole Pre-grouting for Shallow Tunnelling in Gravel Stratum

作　　者：吴江滨[1,2] 

机构地区：[1]清华大学,北京100084 [2]北京建工集团,北京100028

出　　处：《岩土工程技术》2009年第6期280-283,共4页Geotechnical Engineering Technique

基　　金：国家高技术研究发展计划(863)项目(2006AA11Z119);国家自然科学基金项目(50778011);北京市科技计划项目(D08050603130804)

摘　　要：砂卵石地层是一种结构松散、无胶结、成拱性差、渗透性强、自稳能力低的地层,目前在此类地层浅埋暗挖隧道施工中所采取的施工工艺和方法仍不尽完善,如施工时与之配套的深孔预注浆成孔工艺、注浆材料选择、浆液配比、注浆压力及注浆量参数等均无成熟的经验供施工借鉴和参考。基于北京地铁九号线工程浅埋暗挖试验段的工程背景,进行砂卵石地层条件下的深孔预注浆试验,对比分析五种成孔方法、两种注浆方式——前进式和后退式注浆方式,在钻进成孔效果、钻孔效率、注浆压力、注浆量、浆液配比、注浆加固效果等方面的规律和不同特点,提出适合砂卵石地层条件下的深孔预注浆方法。研究成果为北京地铁九号线工程的后续施工以及类似地层深孔预注浆施工提供了有益的借鉴和参考。Gravel stratum is a kind of one with loose structure, poor arching capacity and strong permeability; meanwhile it is eementingless and low in self-stability. At present, construction technique and method of shallow tunnelling in this stratum are not so perfect, such as conduit pore-forming process, grouting material selection, grout proportion, grouting pressure and grouting capacity parameter, which are less of experience for reference during construction. Based on the engineering background of the Shallow tunnelling test section in Beijing Metro Line 9, deep-hole pre-grouting experiment was done under the condition of gravel stratum. This paper compares and analyses the laws and different characteristics of pore-forming effect, drilling efficiency, grouting pressure,grouting capacity, grout proportion and grouting reinforcement effect among five pore-forming methods as well as two grouting methods, which are progressive style and retrograde style, and proposes a deep-hole pre-grouting method which is suitable for gravel stratum. The research conclusions will provide useful reference for following construction of the Beijing Metro Line 9 and deep-hole pre-grouting in similar strata.

关 键 词：隧道工程 浅埋暗挖法 砂卵石地层 深孔注浆 试验研究 

分 类 号：U45[建筑科学—桥梁与隧道工程]