摘要
基于规范法和"桩-土形成水泥土加固体共同作用的等代墩基"原理、群桩效应、负摩阻力作用、桩基承载力计算相关理论公式的对比分析,通过具体的工程实例探讨了水泥搅拌桩与旋喷桩复合地基的拓展计算方法及液化层场地的处理措施。分析结果表明,进行非大面积场地处理时,复合基础承载力计算结果不能全部满足设计要求,结构存在安全隐患,故拓展验算是必要的。对于场地存在液化层的复合地基设计,应根据建筑物设防类别和地基液化等级采取相应的加强措施:一般情况下可进行大面积场地处理,以消除液化层,当采用非大面积场地处理时,不仅应满足承载力验算要求,还应满足抗震构造要求。
Based on specific engineering examples, extension calculation methods of composite foundation with cement mixing piles and jet grouting piles were discussed as well as treatment measures of the area with liquefied layers, considering code methods, principle of ＂formation of cement-soil solid combination equivalent pier foundation from pile and soil＂, the pile group effect, the effect of negative skin friction resistance and contrastive analysis of the theoretical formula for the calculation of the pile foundation ultimate bearing capacity. The analysis results show that in small-area ground treatment, composite foundation bearing capacity calculation results can not meet the design requirements, which make it necessary to carry extensive calculation to ensure safety. For composite foundation designs in ground with liquefaction layers, strengthening measures are necessary according to seismic classification and foundation liquefaction level. In general, large-area ground treatment should be carried out to eliminate the liquefaction layers, and in small-area ground treatment, bearing capacity of the structure as well as the details of seismic design should meet the requirements.
出处
《建筑结构》
CSCD
北大核心
2014年第8期25-30,52,共7页
Building Structure
关键词
复合地基
水泥搅拌桩
旋喷桩
单桩竖向承载力
等代墩基
拓展验算
composite foundation
cement mixing pile
jet grouting pile
single-pile vertical bearing capacity
equivalent pierfoundation
extensive calculation
