动水含砂层胶凝材料旋喷桩止水技术  

Cementitious Material Water-sealing Technology of Rotary Jet Grouting Pile in Layerwith Dynamic Water and Sand

作　　者：李超 李建平 陈智斌 LI Chao;LI Jianping;CHEN Zhibin(Guangdong Zhonggong Architectural Design Institute Co.,Ltd.Guangzhou 510670,China)

机构地区：[1]广东省重工建筑设计院有限公司,广州510670

出　　处：《广东土木与建筑》2024年第8期31-33,48,共4页Guangdong Architecture Civil Engineering

基　　金：广东省住房和城乡建设厅科技创新计划(2022-K4-552548)。

摘　　要：在动水含砂地层中,由于地下水流动和水泥性能局限,传统工艺难以成桩。为改善成桩效果,一方面采用早凝性、防渗性更好的矿物基胶凝材料替代水泥以减少动水影响,另外采用双高压大直径旋喷工法使搅拌更充分,从而达到较好的成桩效果。在典型动水含砂地层的止水帷幕工程中,传统的水泥搅拌桩无法止水造成基坑涌水,因此应用上述新材料和新工艺进行止水帷幕施工,结果表明成桩效果和止水效果极佳,说明胶凝材料是动水砂层中成桩的理想材料,且大直径双高压旋喷桩工艺适用于富水软土、含砂地层的软土加固和地基处理。In the dynamic water sandy formation,due to the limitations of groundwater flow and cement performance,traditional processes are difficult to form piles.To improve the pile forming effect,one approach is to replace cement with mineral-based cementitious materials that exhibit better early setting and impermeability to reduce the impact of dynamic water.Additionally,a dual high-pressure large-diameter jet grouting technique is employed to ensure thorough mixing of the cementitious materials and the strata,thereby achieving superior pile formation and water sealing effects.In waterproof curtain engineering in typical dynamic water-saturated sandy strata,traditional cement mixing piles fail to prevent water inflow,leading to excavation flooding.Therefore,the aforementioned new materials and processes are applied for waterproof curtain construction.The results demonstrate excellent pile formation and water sealing effects,confirming that the cementitious material is an ideal material for pile formation in dynamic water sand layers,and the large diameter double high pressure rotary jet grouting pile technology is suitable for soft soil reinforcement and foundation treatment in water-rich soft soil and sandy strata.

关 键 词：动水 胶凝材料 大直径旋喷桩 止水帷幕 

分 类 号：TU473.12[建筑科学—结构工程]