水泥搅拌桩复合地基加固性能研究  

STUDY ON STRENGTHENING PERFORMANCE OF COMPOSITE FOUNDATION WITH CEMENT MIXING PILES

作　　者：赵宏华[1] 韩选江[1] 

机构地区：[1]南京工业大学土木工程学院,南京210009

出　　处：《建筑技术》2008年第5期380-383,共4页Architecture Technology

基　　金：江苏省兴化设计院资助

摘　　要：搅拌桩复合地基设计时一般取0.8～1.2m的小桩距进行满堂布桩,由于"群桩效应,"其沉降一般比较大。将桩距拉大后,桩间土附加应力不会相互叠加,使复合地基有效扩散应力,减少沉降。现场测试表明,桩距较大的水泥搅拌桩复合地基桩土应力分布合理,使桩和土体各部分的承载潜能均可以得到较好的发挥,复合模量在荷载作用下逐渐趋于稳定值,从而使复合地基可以较好满足承载和沉降的要求。Piles are usually arranged in the whole foundation at pile space of 0.8m to 1.2m in the design of composite foundation with cement mixing piles. However, due to the“group piles effect”, generally it has a large settlement. If pile space is widened, the additional stress of soil between piles cannot overlap while stress of the composite foundation is diffused effectively and the settlement reduced. Field testing results show that the composite foundation of wider pile space has a reasonable soil stress distribution, and make better use of load-bearing potentials of the piles and soil. The composite modulus can become a stable value step by step under load, thus enable the composite foundation to better meet the requirements of load bearing capacity and settlement.

关 键 词：水泥搅拌桩 复合地基 桩土应力比 群桩效应 

分 类 号：TU473[建筑科学—结构工程]