深圳大学学报理工版

王腾,席爱斌,崔春义,等.堆煤软土场地中群桩体系工作性能的数值分析[J].深圳大学学报理工版,2019,36(No.1(1-110)):67-73.[doi:10.3724/SP.J.1249.2019.01067]
WANG Teng,XI Aibin,CUI Chunyi,et al.Numerical analysis of working performance of pile group embedded in soft soil subjected to coal loading[J].Journal of Shenzhen University Science and Engineering,2019,36(No.1(1-110)):67-73.[doi:10.3724/SP.J.1249.2019.01067]

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堆煤软土场地中群桩体系工作性能的数值分析

王腾^1,2,席爱斌²,崔春义¹,孟坤¹,梁志孟¹,邢国雷²

1)大连海事大学土木工程系,辽宁大连 116026; 2)国核电力规划设计研究院有限公司,北京 100095

关键词：岩土工程; 软土场地; 群桩基础; 堆煤荷载; 有限元; 数值分析

Numerical analysis of working performance of pile group embedded in soft soil subjected to coal loading

WANG Teng^1,2, XI Aibin², CUI Chunyi¹, MENG Kun¹, LIANG Zhimeng¹, and XING Guolei²

1)Department of Civil Engineering, Dalian Maritime University, Dalian 116026, Liaoning Province, P.R.China 2)State Nuclear Electric Power Planning, Design & Research Institute Co. Ltd., Beijing 100095, P.R.China

Keywords： geotechnical engineering; soft soil site; pile group foundation; coal loading; finite element; numerical analysis

DOI: 10.3724/SP.J.1249.2019.01067

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为研究堆煤荷载作用下软土场地中群桩基础受力变形特性,基于有限元数值平台ABAQUS,建立了既定工况下考虑桩土相互作用的软土场地-群桩体系数值分析模型,分析堆煤荷载作用下软土场地-群桩体系的相互作用,探讨堆煤荷载作用下软土场地中群桩基础桩身受力及变形规律. 结果表明,堆煤软土场地中,在堆煤荷载和上部结构荷载的共同作用下,群桩基础桩身易产生较大侧向位移,同时桩身会产生较大拉应力,使得桩身稳定性、形变及承载能力无法满足工程要求. 此类软弱场地土中存在堆煤荷载作用时,需首先对场地采取真空预压地基处理措施,并进行计算校核,使软土场地-群桩相互作用体系达到承载变形要求.

In order to study the mechanical characteristics of pile group foundation in soft soil site with coal loading, we establish the two-dimensional numerical analysis model considering pile-soil interaction for the pile group-soft soil ground system based on finite element numerical platform ABAQUS. We discuss the mechanism of internal force and deformation of interaction system of pile group in soft soil site. The results show that the pile body of pile group foundation is liable to produce large lateral displacement under the joint action of coal-piling load and superstructure load in soft soil site, and the pile body will produce large tensile stress, which makes the stability, deformation and bearing capacity of pile body unable to meet engineering requirements. For coal loading on this kind of soft soil ground, the vacuum preloading foundation treatment measures should be taken on the site, meanwhile the calculation and verification should be carried out to make the pile group-soft ground interaction system meet the bearing deformation requirements.

引言
1 工程概况
2 有限元模型
3 计算结果分析
4 结论

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