挡墙转动对既有刚性桩复合地基荷载分配影响研究
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摘要
目的探究挡墙转动对邻近刚性桩复合地基荷载分配机制的影响.方法采用室内模型试验分析对比挡墙静止和转动模式下4桩复合地基的荷载分配机制.结果挡墙转动使墙后土体发生移动,进而使土体先发生沉降,上部荷载由此向桩顶转移.桩顶应力不断增大,桩间土应力不断减小,使得桩土应力比持续增大;桩顶应力和桩端应力在转动角度10~(-3)rad以内变化较大,后期趋于稳定,总体趋势呈现二次抛物线形状;转动导致土体位移量由近而远减小,后桩应力增长率明显大于前桩,且后桩应力增长速率约为前桩应力增长速率的3倍.结论桩顶应力、桩端荷载承担比和桩土应力比随转动量的增加而逐渐增加,且后桩桩顶应力增加快于前桩;桩间土应力随转动量增加而减少,且靠近转动挡墙处桩间土应力下降最快.
Influence of retaining wall rotation on the load distribution mechanism of adjacent rigid pile composite foundation is studied.The indoor model test is used to analyze the load distribution mechanism of four piles composite foundations under static and rotating modes of retaining wall.The displacement of the soil behind the wall is caused by the rotation of the retaining wall.The soil first settles,then the upper load is transferred to the top of the pile.Therefore,the pile top stress is continuously increased,and the soil stress between piles is continuously reduced,so that the pile-soil stress ratio continues to increase.The pile top stress and the pile end stress vary greatly within the rotation angle of 10~(-3) rad,and tend to be stable in the later stage,and the overall trend shows a quadratic parabolic shape.The displacement of the soil is caused by rotation to decrease from near to far,and the growth rate of the post-pile stress is significantly larger than that of the front-pile,and the growth rate of the post-pile stress is about three times that of the front-pile.The pile top stress,pile end load ratio and pile-soil stress ratio grow with the increase of the rotation amount,and the post-pile top stress increases faster than the front-pile;the soil stress between piles decreases with the increase of the rotation amount;pile soil stress near the retaining wall drops fastest.
Influence of retaining wall rotation on the load distribution mechanism of adjacent rigid pile composite foundation is studied.The indoor model test is used to analyze the load distribution mechanism of four piles composite foundations under static and rotating modes of retaining wall.The displacement of the soil behind the wall is caused by the rotation of the retaining wall.The soil first settles,then the upper load is transferred to the top of the pile.Therefore,the pile top stress is continuously increased,and the soil stress between piles is continuously reduced,so that the pile-soil stress ratio continues to increase.The pile top stress and the pile end stress vary greatly within the rotation angle of 10~(-3) rad,and tend to be stable in the later stage,and the overall trend shows a quadratic parabolic shape.The displacement of the soil is caused by rotation to decrease from near to far,and the growth rate of the post-pile stress is significantly larger than that of the front-pile,and the growth rate of the post-pile stress is about three times that of the front-pile.The pile top stress,pile end load ratio and pile-soil stress ratio grow with the increase of the rotation amount,and the post-pile top stress increases faster than the front-pile;the soil stress between piles decreases with the increase of the rotation amount;pile soil stress near the retaining wall drops fastest.
引文
[1] 王洪亮,宋二祥,宋福渊.紧邻既有建筑基坑有限土体主动土压力计算方法[J].工程力学,2014,31(4):76-81.(WANG Hongliang,SONG Erxiang,SONG Fuyuan.Calclulation of active earth pressure for limited soil between existing building and excavation[J].Engineering mechanics,2014,31(4):76-81.)
[2] 杨明辉,汪罗成,赵明华.有限土体主动土压力计算的土拱效应分析[J].建筑结构,2013,43(2):71-75.(YANG Minghui,WANG Luocheng,ZHAO Minghua.Calculation of active earth pressure for finite soils based on the soil arching theory[J].Building structure,2013,43(2):71-75.)
[3] 杨明辉,汪罗成,赵明华.考虑变形非线性影响的有限土体土压力计算模型[J].水利学报,2012,43(9):1121-1126.(YANG Minghui,WANG Luocheng,ZHAO Minghua.A calculation model of the earth pressure for the limited soils considering the nonlinear influence of the displacement[J].Journal of hydraulic engineering,2012,43(9):1121-1126.)
[4] 闫澍旺,郎瑞卿,孙立强,等.基于薄板理论的刚性桩网复合地基桩土应力比计算[J].岩石力学与工程学报,2017,36(8):237-246.(YAN Shuwang,LANG Ruiqing,SUN Liqiang,et al.Calculation of pile-soil stress ratio in composite foundation with rigid pile-net based on plate theory[J].Chinese journal of rock mechanics and engineering,2017,36(8):237-246.)
[5] 徐新星,张季超.刚性桩长变化对CM复合地基工作性状影响[J].地下空间与工程学报,2018,14(1):124-130.(XU Xinxing,ZHANG Jichao.Influence of rigid pile length on working characteristics of CM composite foundation[J].Chinese journal of underground space and engineering,2018,14(1):124-130.)
[6] 李连祥,符庆宏,张海北,等.复合地基侧向力学性状离心试验方案研究与设计[J].重庆交通大学学报(自然科学版),2016,35(2):80-88.(LI Liangxiang,FU Qinghong,ZHANG Haibei et al.Research and design of centrifuge model tests on lateral mechanics properties of composite foundation[J].Journal of Chongqing jiaotong university(natural sciences edition),2016,35(2):80-88.)
[7] 王洪亮,宋二祥,宋福渊.基坑周边荷载引起支护结构上土压力的分析[J].工业建筑,2012,42(9):90-95.(WANG Hongliang,SONG Erxiang,SONG Fuyuan.Analysis of earth pressure on the retaining structure due to surcharge near the excavation[J].Industrial building,2012,42(9):90-95.)
[8] 王保军,周同和,郭院成.特殊条件下基坑支护侧向土压力与稳定性计算方法讨论[J].河南科学,2012,30(9):1271-1275.(WANG Baojun,ZHOU Tonghe,GUO Yuancheng.Discussion on the calculation of lateral soil pressure and stability of foundation pit supporting under special conditions[J].He′nan science,2012,30(9):1271-1275.)
[9] 应宏伟.考虑邻近地下室外墙侧压力影响的平动模式挡土墙主动土压力研究.岩石力学与工程学报[J].2011(1):2970-2978.(YING Hongwei.Study of active earth pressure on retaining wall subject to translation mode considering lateral pressure on adjacent existing basement exterior wall[J].Chinese journal of rock mechanics and engineering,2011(1):2970-2978.)
[10] ZHU Xiaojun.Analysis of the load sharing behaviour and cushion failure mode for a disconnected piled raft[J].Advances in materials science and engineering,2017(2):1-13.
[11] 佟建兴,闫明礼,王明山,等.刚性桩复合地基侧向土压力试验研究[J].岩土力学,2014,35(6):1572-1578.(TONG Jianxing,YAN Mingli,WANG Mingshan et al.Experimental study of lateral earth pressure of rigid pile composite foundation[J].Rock and soil mechanics,2014,35(6):1572-1578.)
[12] 刘鹏,杨光华,范泽,等.刚性桩复合地基尺寸效应试验研究[J].岩石力学与工程学报,2016,35(1):187-200.(LIU Peng,YANG Guanghua,FAN Ze,et al.Experimental study on scale effect of rigid pile composite foundation[J].Chinese journal of rock mechanics and engineering,2016,35(1):187-200.)
[13] 段晓沛,司文明,曾伟.CFG桩复合地基变形承载特性的室内试验研究[J].北方交通,2014(6):101-104.(DUAN Xiaopei,SI Wenming,ZENG Wei.The laboratory test investigation on the deformation bearing characteristics of cement fly-ash grave composite foundation [J].North transportation,2014(6):101-104.)
[14] 赵明华,龙军,张玲,等.不同型式复合地基试验对比分析[J].岩土工程学报,2013,35(4):611-618.(ZHAO Minghua,LONG Jun,ZHANG Ling,et al.Comparative analysis of model tests on different types of composite foundations[J].Chinese journal of rock engineering,2013,35(4):611-618.)
[15] TRADIGO F.Non-linear soil–structure interaction in disconnected piled raft foundations[J].Computers and geotechnics,2015,63:121-134.
[16] WANG Guihe.Effect of cantilever soldier pile foundation excavation closing to an existing composite foundation[J].Journal of central south university,2013,20(5):1384-1396.
[17] 梁云发.竖向-水平荷载联合作用下单桩性状模型试验研究[J].建筑结构,2013,43(6):92-94.(LIANG Yunfa.Experimental study on single pile traits model under combined vertical horizontal loads[J].Building structure,2013,43(6):92-94.)
[18] 姚国圣.土体侧移作用下轴向受荷单桩承载性状数值分析[J].同济大学学报(自然科学版),2011(1):1-6.(YAO Guosheng.Numerical analysis of bearing behavior of axially loaded single pile under lateral displacement[J].Journal of tongji university(natural science),2011(1):1-6.)
[19] 郑刚,颜志雄,雷华阳等.基坑开挖对临近桩基影响的实测及有限元数值模拟分析[J].岩土工程学报,2007,29(5):638-643.(ZHENG Gang,YAN Zhixiong LEI Huayang,et al.Field measurement and finite element numerical simulation analysis of influence of foundation pit excavation on adjacent pile foundation[J].Chinese journal of rock engineering,2007,29(5):638-643.)
[20] 佟建兴,孙训海,杨新辉,等.长短刚性桩复合地基桩、土承载性状与厚径比相关关系试验研究[J].岩土工程学报,2013(5):955-960.(TONG Jianxing,SUN Xunhai,YANG Xinhui,et al.Experimental study on the relationship between pile and soil bearing behavior and thickness-diameter ratio of composite foundation with long and short rigid piles [J].Journal of geotechnical engineering,2013(5):955-960.)
[2] 杨明辉,汪罗成,赵明华.有限土体主动土压力计算的土拱效应分析[J].建筑结构,2013,43(2):71-75.(YANG Minghui,WANG Luocheng,ZHAO Minghua.Calculation of active earth pressure for finite soils based on the soil arching theory[J].Building structure,2013,43(2):71-75.)
[3] 杨明辉,汪罗成,赵明华.考虑变形非线性影响的有限土体土压力计算模型[J].水利学报,2012,43(9):1121-1126.(YANG Minghui,WANG Luocheng,ZHAO Minghua.A calculation model of the earth pressure for the limited soils considering the nonlinear influence of the displacement[J].Journal of hydraulic engineering,2012,43(9):1121-1126.)
[4] 闫澍旺,郎瑞卿,孙立强,等.基于薄板理论的刚性桩网复合地基桩土应力比计算[J].岩石力学与工程学报,2017,36(8):237-246.(YAN Shuwang,LANG Ruiqing,SUN Liqiang,et al.Calculation of pile-soil stress ratio in composite foundation with rigid pile-net based on plate theory[J].Chinese journal of rock mechanics and engineering,2017,36(8):237-246.)
[5] 徐新星,张季超.刚性桩长变化对CM复合地基工作性状影响[J].地下空间与工程学报,2018,14(1):124-130.(XU Xinxing,ZHANG Jichao.Influence of rigid pile length on working characteristics of CM composite foundation[J].Chinese journal of underground space and engineering,2018,14(1):124-130.)
[6] 李连祥,符庆宏,张海北,等.复合地基侧向力学性状离心试验方案研究与设计[J].重庆交通大学学报(自然科学版),2016,35(2):80-88.(LI Liangxiang,FU Qinghong,ZHANG Haibei et al.Research and design of centrifuge model tests on lateral mechanics properties of composite foundation[J].Journal of Chongqing jiaotong university(natural sciences edition),2016,35(2):80-88.)
[7] 王洪亮,宋二祥,宋福渊.基坑周边荷载引起支护结构上土压力的分析[J].工业建筑,2012,42(9):90-95.(WANG Hongliang,SONG Erxiang,SONG Fuyuan.Analysis of earth pressure on the retaining structure due to surcharge near the excavation[J].Industrial building,2012,42(9):90-95.)
[8] 王保军,周同和,郭院成.特殊条件下基坑支护侧向土压力与稳定性计算方法讨论[J].河南科学,2012,30(9):1271-1275.(WANG Baojun,ZHOU Tonghe,GUO Yuancheng.Discussion on the calculation of lateral soil pressure and stability of foundation pit supporting under special conditions[J].He′nan science,2012,30(9):1271-1275.)
[9] 应宏伟.考虑邻近地下室外墙侧压力影响的平动模式挡土墙主动土压力研究.岩石力学与工程学报[J].2011(1):2970-2978.(YING Hongwei.Study of active earth pressure on retaining wall subject to translation mode considering lateral pressure on adjacent existing basement exterior wall[J].Chinese journal of rock mechanics and engineering,2011(1):2970-2978.)
[10] ZHU Xiaojun.Analysis of the load sharing behaviour and cushion failure mode for a disconnected piled raft[J].Advances in materials science and engineering,2017(2):1-13.
[11] 佟建兴,闫明礼,王明山,等.刚性桩复合地基侧向土压力试验研究[J].岩土力学,2014,35(6):1572-1578.(TONG Jianxing,YAN Mingli,WANG Mingshan et al.Experimental study of lateral earth pressure of rigid pile composite foundation[J].Rock and soil mechanics,2014,35(6):1572-1578.)
[12] 刘鹏,杨光华,范泽,等.刚性桩复合地基尺寸效应试验研究[J].岩石力学与工程学报,2016,35(1):187-200.(LIU Peng,YANG Guanghua,FAN Ze,et al.Experimental study on scale effect of rigid pile composite foundation[J].Chinese journal of rock mechanics and engineering,2016,35(1):187-200.)
[13] 段晓沛,司文明,曾伟.CFG桩复合地基变形承载特性的室内试验研究[J].北方交通,2014(6):101-104.(DUAN Xiaopei,SI Wenming,ZENG Wei.The laboratory test investigation on the deformation bearing characteristics of cement fly-ash grave composite foundation [J].North transportation,2014(6):101-104.)
[14] 赵明华,龙军,张玲,等.不同型式复合地基试验对比分析[J].岩土工程学报,2013,35(4):611-618.(ZHAO Minghua,LONG Jun,ZHANG Ling,et al.Comparative analysis of model tests on different types of composite foundations[J].Chinese journal of rock engineering,2013,35(4):611-618.)
[15] TRADIGO F.Non-linear soil–structure interaction in disconnected piled raft foundations[J].Computers and geotechnics,2015,63:121-134.
[16] WANG Guihe.Effect of cantilever soldier pile foundation excavation closing to an existing composite foundation[J].Journal of central south university,2013,20(5):1384-1396.
[17] 梁云发.竖向-水平荷载联合作用下单桩性状模型试验研究[J].建筑结构,2013,43(6):92-94.(LIANG Yunfa.Experimental study on single pile traits model under combined vertical horizontal loads[J].Building structure,2013,43(6):92-94.)
[18] 姚国圣.土体侧移作用下轴向受荷单桩承载性状数值分析[J].同济大学学报(自然科学版),2011(1):1-6.(YAO Guosheng.Numerical analysis of bearing behavior of axially loaded single pile under lateral displacement[J].Journal of tongji university(natural science),2011(1):1-6.)
[19] 郑刚,颜志雄,雷华阳等.基坑开挖对临近桩基影响的实测及有限元数值模拟分析[J].岩土工程学报,2007,29(5):638-643.(ZHENG Gang,YAN Zhixiong LEI Huayang,et al.Field measurement and finite element numerical simulation analysis of influence of foundation pit excavation on adjacent pile foundation[J].Chinese journal of rock engineering,2007,29(5):638-643.)
[20] 佟建兴,孙训海,杨新辉,等.长短刚性桩复合地基桩、土承载性状与厚径比相关关系试验研究[J].岩土工程学报,2013(5):955-960.(TONG Jianxing,SUN Xunhai,YANG Xinhui,et al.Experimental study on the relationship between pile and soil bearing behavior and thickness-diameter ratio of composite foundation with long and short rigid piles [J].Journal of geotechnical engineering,2013(5):955-960.)