堆煤软土场地中群桩体系工作性能的数值分析
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摘要
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.
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.
引文
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[13]周小文,王晓亮,汪明元,等.膜袋砂围堰荷载下软土地基破坏分区特性研究[J].岩土工程学报,2017,39(S2):45-48.ZHOU Xiaowen,WANG Xiaoliang,WANG Mingyuan,et al. Characteristics of failure zones of soft soil foundation under flexible load of sandbag cofferdam[J]. Chinese Journal of Geotechnical Engineering,2017,39(S2):45-48.(in Chinese)
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[2]吴有霞,王湛,钟润辉,等.软基煤场堆载挡风墙桩基桩土共同作用分析[J].浙江大学学报工学版,2013,47(3):502-507.WU Youxia, WANG Zhan, ZHONG Runhui, et al.Analysis of interaction between dust break wall piles and soil subjected to coal loading in soft foundation[J]. Journal of Zhejiang University Engineering Science,2013,47(3):502-507.(in Chinese)
[3]张琰,陈培,赵贞欣.软土地基挤扩支盘桩基础试验研究[J].岩土工程学报,2013,35(S2):994-997.ZHANG Yan,CHEN Pei,ZHAO Zhenxin. Experimental study on squeezed branch pile foundation in soft soil ground[J]. Chinese Journal of Geotechnical Engineering,2013,35(S2):994-997.(in Chinese)
[4]郭志广,魏丽敏,何群,等.深厚软土地基预制管桩荷载传递试验与数值分析[J].中南大学学报自然科学版,2014,45(10):3589-3595.GUO Zhiguang,WEI Limin,HE Qun,et al. Experimental and numerical analyses of load transfer characteristics of prestressed concrete pipe pile in deep soft soil[J]. Journal of Central South University Science and Technology,2014,45(10):3589-3595.(in Chinese)
[5]赵亮,王昌贤,王俊杰.高速公路软土地基加固效果数值模拟[J].重庆交通大学学报自然科学版,2014,33(1):60-63.ZHAO Liang,WANG Changxian,WANG Junjie. Numerical simulation for reinforcement effect of highway soft foundation[J]. Journal of Chongqing Jiaotong University Natural Science,2014,33(1):60-63.(in Chinese)
[6]彭龙仕,庞林祥.软基堆载对邻近桥桩作用的数值分析[J].公路交通科技,2014,31(12):67-72.PENG Longshi,PANG Linxiang. Numerical analysis of adjacent bridge piles influenced by surcharge loads on soft foundation[J]. Journal of Highway and Transportation Research and Development,2014,31(12):67-72.(in Chinese)
[7]WU J,CHENG Q,WEN H,et al. Comparison on the vertical behavior of lattice shaped diaphragm wall and pile group under similar material quantity in soft soil[J].KSCE Journal of Civil Engineering,2015,19(7):2051-2060.
[8]陈福江,马建林,朱林,等.深厚软土地基群桩沉降计算深度现场试验研究[J].地下空间与工程学报,2015,11(5):1144-1151.CHEN Fujiang,MA Jianlin,ZHU Lin,et al. Field test for determining compression layer thickness under pile group in deep soft soil foundation[J]. Chinese Journal of Underground Space and Engineering, 2015, 11(5):1144-1151.(in Chinese)
[9]丁任盛.临近堆载对深厚软土桩基影响的现场试验研究[J].铁道科学与工程学报,2015,12(2):291-296.DING Rensheng. Field test study on pile foundation subjected to adjacent surcharge in deep-soft soil strata[J]. Journal of Railway Science and Engineering,2015,12(2):291-296.(in Chinese)
[10]SHARAFI H,SOJOUDI Y. Experimental and numerical study of pile-stabilized slopes under surface load conditions[J]. International Journal of civil Engineering,2016,14(4):221-232.(in Chinese)
[11]郑明新,胡国平,褚东升,等.路堤填筑荷载作用下深厚软基桥台桩变形及处理措施分析[J].施工技术,2016(13):45-49.ZHENG Mingxin,HU Guoping,CHU Dongsheng,et al.Analysis on the behavior of piles on deep soft foundation due to heaped load and treatment measures[J].Construction Technology,2016(13):45-49.(in Chinese)
[12]赵文强,黄志军.砂砾桩处理公路软土地基性状现场试验研究[J].兰州交通大学学报自然科学版,2016,35(1):106-110.ZHAO Wenqiang,HUANG Zhijun. Experimental study on the behavior of soft soil foundation of highway by sandgravel pile process[J]. Journal of Lanzhou Jiaotong University Natural Science,2016,35(1):106-110.(in Chinese)
[13]周小文,王晓亮,汪明元,等.膜袋砂围堰荷载下软土地基破坏分区特性研究[J].岩土工程学报,2017,39(S2):45-48.ZHOU Xiaowen,WANG Xiaoliang,WANG Mingyuan,et al. Characteristics of failure zones of soft soil foundation under flexible load of sandbag cofferdam[J]. Chinese Journal of Geotechnical Engineering,2017,39(S2):45-48.(in Chinese)
[14]CAI Y Y,TU B X,ZHU Y L,et al. Numerical simulation study on lateral displacement of pile foundation and construction process under stacking loads[J]. Compliexty,2018(1):1-17.