真空预压影响区旋喷桩防护效果  

Effect of Jet Grouting Piles to Protect Areas of Soft Ground Improved by Vacuum Preloading

作　　者：邱青长[1] 董志良[2] 莫海鸿[1] 蔡南树 

机构地区：[1]华南理工大学土木工程系,广东广州510640 [2]广州四航工程技术研究院,广东广州510230 [3]广州港集团南沙工程办公室,广东广州510700

出　　处：《中国港湾建设》2006年第3期16-19,共4页China Harbour Engineering

基　　金：广州四航工程技术研究院资助项目(S2005D24);华南理工大学自然科学基金资助项目(B03~E5050960)

摘　　要：基于旋喷桩防护真空预压影响区构筑物的工程实例,对影响区防护和未防护断面的表面位移、深层侧向位移、地层中孔隙水压力和地下水位变化等进行对比试验。试验结果表明旋喷桩的止水和支护效果好,保护了建筑物的安全;分析得出旋喷桩与土层交界面处的裂缝和影响区内的排水板减弱了真空预压对周围环境的影响程度,但对加固区内加固效果有不利影响。并对旋喷桩的防护效果进行评价和进一步研究提出建议。Based on the engineering examples wherein let-grouting piles were used to protect structures in areas of soft ground influenced by vacuum preloading, comparative tests were made on the surface displacement, lateral displacement of deep soil, pore water pressure in soil and change in ground water in the protected and unprotected areas influenced by vacuum preloading. The test results showed that jet-grouting piles produced good water stopping and supporting effect to protect the structures in the affected areas. The analyses indicated that cracks developed between the jet-grouting piles and the soil and the prefabricated drains in the improved areas diminished the influence of vacuum preloading upon the surrounding environment, but produced detrimental effect upon the improvement of the soil treated by the vacuum preloading method. The effect of protection by the jet-grouting piles was evaluated and recommendations were made for further studies.

关 键 词：软基处理 真空预压 防护工程 旋喷桩 

分 类 号：TU473[建筑科学—结构工程]