围土注浆缓释和抑制井壁附加力效应及应用  

Application and effect of grouting in surrounding soil on releasing and restraining additional stress of shaft lining

作　　者：周国庆[1] 刘雨忠[2] 冯学武[2] 赵光思[1] 

机构地区：[1]中国矿业大学建筑工程学院,江苏徐州221008 [2]上海大屯能源股份有限公司,江苏沛县221600

出　　处：《岩土工程学报》2005年第7期742-745,共4页Chinese Journal of Geotechnical Engineering

基　　金：国家973项目"灾害环境下重大工程安全性基础研究"(2002CB412704)

摘　　要：阐述了预防与治理厚表土层立井井壁破裂的围土层注浆加固方法的机理,将围土层注浆“缓释”和“抑制”井壁竖直附加力的原理应用到某一矿井工程治理中并取得成功。通过埋设于井壁中的混凝土应变传感器实测数据表明,井壁已有的竖向附加应变减少了330με,这一结果说明井壁中既有的竖直附加力得到有效“缓释”;间歇期间的井壁附加应变几乎无增量,这一演变表明井壁附加力的增长得到了有效“抑制”;而地面变形与井壁受力实测趋势完全吻合。围土层注浆加固能够有效地改善井壁的受力状态,对井壁的既有应变有显著的缓释作用,对矿井疏排水造成的井壁附加应变的增长有明显的抑制作用。这一理论与技术可以在类似矿井井壁破裂防治与治理工程中推广应用。The mechanism of preventing and curing the rupture of shaft lining by cement grouting in surrounding soil was expounded showing that the vertical additional stress of shaft lining could be released and restrained, and the rupture of shaft lining was cured in the practical application of this method. It is indicated by the strain sensors embedded in the concrete of shaft lining that the vertical additional strain of shaft lining decreases by 330 με, and the vertical stress of shaft lining was effectively released. The strain of shaft lining during intermission was almost invariable, the increase of stress of shaft lining was effectively restrained. Ground deformation agrees well with the measured results of the stressed shaft lining. Surrounding soil grouting can mend effectively the load distribution of shaft lining and release obviously the strain of shaft lining, and an restrain obviously the additional increase of stress of shaft lining induced by drainage. The suggested mechanism and technology can be used for preventing and curing rupture of shaft lining in other similar mine.

关 键 词：井壁破裂 竖向附加力 围土注浆 缓释 抑制 

分 类 号：TU942[建筑科学—建筑技术科学]