大面积堆载对桩基工作性能影响的数值模拟和监测分析  

Numerical simulation and monitoring analysis of influence of large-area stacking load on working performance of pile foundation

作　　者：周勇[1,2] 康迪[1,2] 李韬[3] 康易年 

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050 [3]同济大学土木工程学院,上海200092 [4]上海京郊房地产开发有限公司,上海201702

出　　处：《兰州理工大学学报》2016年第5期112-116,共5页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51568042)

摘　　要：受大面积堆载影响引起的软土土体沉降会导致桩基产生负摩阻力,并同时影响建筑物下基底土压力变化,使建筑物发生倾斜.在工程中经常使用堆载预压法来改善桩土间不均匀沉降.采用现场试验和数值分析比较的方法,经过桩基足尺试验,对预压后土体的固结程度进行分析,分析表明预压2个月后土体固结已达到60%,可以看出堆载预压后土体已经开始固结.随后通过Adina软件数值模拟分析验证,土体沉降量和负摩阻力达到了《建筑地基基础设计规范》要求,沉降观测表明差异沉降在1.9cm内,倾斜值不超过0.4%.Soft soil settlement induced by large-area stacking load may lead to generation of negative fric- tional resistance in pile foundation settlement, and mean time, will make base soil pressure under building change so that the building will tilt. In engineering, the stack load precompression method is often used to improve the uneven settlement between pile and soil. The comparison method between field test and nu- merical analysis was employed to carry out analysis of consolidation degree of soil after stacking load pre- compression through full-scale test of pile foundation. It is shown by the analysis that 2 months after, the consolidation will reach 60%, meaning that the precompressed soil already starts its consolidation. Then, it is verified by Adina numerical simulation analysis that the soil settlement and negative frictional resist- ance reach the requirements of Code for Design of Building Foundation. Settlement observation shows that the settlement deviation will be within the range of 1.9 cm and construction tilt will be less 0. 4%.

关 键 词：堆载预压法 大面积堆载 建筑物倾斜 数值模拟 监测 

分 类 号：TU473.1[建筑科学—结构工程]