临海岩溶地区基坑工程止水施工技术  

Water-resistance Technology of Foundation Pit Engineering in Coastal karst Areas

作　　者：温文峰[1] 严志娟 WEN Wenfeng;YAN Zhijuan(Guangdong Polytechnic of Water Resources and Electrical Engineering Guangzhou 510925,China;Guangzhou Huashang Vacational College Guangzhou 511300,China)

机构地区：[1]广东水利电力职业技术学院,广州510925 [2]广州华商职业学院,广州511300

出　　处：《广东土木与建筑》2021年第7期116-119,131,共5页Guangdong Architecture Civil Engineering

基　　金：国家双高建设计划水利水电建筑工程专业群教师教学创新团队建设(GZ04)。

摘　　要：结合某国外基坑工程实例,对临海岩溶地区基坑工程的止水施工方法进行了研究。实践表明临海岩溶地区的地质构造复杂、岩体孔隙发育,透水性特别强,基坑开挖时的涌水量大,防渗要求高。强排止水及设置局部浅层止水帷幕均不适用于临海岩溶地区的基坑止水。为有效控制涌水量,止水帷幕需沿基坑四周设置并延伸至不透水层,形成封闭的隔水体系。可在帷幕灌浆的基础上辅以有效排水措施进行基坑止水,采用我国规范设计时应适当提高其设计标准,并采用合适的施工方法提高帷幕体的防渗能力。The water-resistance technology of coastal karst areas was studied combined with a foreign example of foundation pit engineer‐ing.It was showed that the geological structure is complex,and the fracture is well developed in such areas,leading to the permeability par‐ticularly strong.The amount of water is large when excavating,the impermeability requirements of foundation pit excavation is relatively high.Excavation&drainage,setting up partial shallow curtains were proved to be ineffective to water-resistance of foundation pit engineer‐ing of coastal karst areas.In order to control the amount of water effectively,water curtains should be set around the foundation pit and ex‐tended to the impervious layer,to form a closed water barrier system.Curtain grouting combine with drainage measures was proved to be ef‐fective,the design standard of curtain grouting should be appropriately increased when using the Chinese standards,and appropriate construc‐tion method should be used to improve the anti-seepage ability of the curtain body,too.

关 键 词：临海 岩溶 基坑 止水 帷幕灌浆 

分 类 号：TU753[建筑科学—建筑技术科学]