地表深孔注浆对毗邻基坑建筑保护作用分析
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摘要
为了控制基坑施工对毗邻建筑的影响,研究地表深孔注浆对建筑和基坑的保护效果,依托于深圳地铁10号线的出入线明挖区间的基坑工程,采用ABAQUS数值模拟软件,分析了3种不同的地表深孔注浆方案对建筑沉降变形、基坑横向变形及基坑支撑内力的影响.研究结果表明:地表深孔注浆加固非常明显地抑制了建筑地基的沉降和基坑靠近建筑侧壁的横向位移,但对基坑底部隆起的抑制作用比较小;角部注浆孔中出现了应力集中区域,方案3中注浆孔的应力集中现象比方案2更为明显;方案2和方案3的地表深孔注浆加固效果相近,方案2中注浆孔的应力更为均匀合理.
To control the effect of foundation pit construction on adjacent building,the effects of deep hole grouting from surface on foundation pit and adjacent building were investigated.Based on the foundation pit in Shenzhen Metro Line 10,the effects of three conditions of deep hole grouting from surface on settlement deformation of building,lateral deformation and support internal force of foundation pit were analyzed by ABAQUS software.The results show that the lateral deformation of foundation pit and the settlement deformation of adjacent foundation building are decreased by deep hole grouting from surface,while it has slight effect on the bottom deformation of foundation pit.The stress concentration is observed on grouting hole at the corner,which is especially obvious in the 3rd condition.The effect of grouting hole in the 2nd condition and 3rd condition is close,while the stress in grouting hole of 2nd condition is more uniform and reasonable.
To control the effect of foundation pit construction on adjacent building,the effects of deep hole grouting from surface on foundation pit and adjacent building were investigated.Based on the foundation pit in Shenzhen Metro Line 10,the effects of three conditions of deep hole grouting from surface on settlement deformation of building,lateral deformation and support internal force of foundation pit were analyzed by ABAQUS software.The results show that the lateral deformation of foundation pit and the settlement deformation of adjacent foundation building are decreased by deep hole grouting from surface,while it has slight effect on the bottom deformation of foundation pit.The stress concentration is observed on grouting hole at the corner,which is especially obvious in the 3rd condition.The effect of grouting hole in the 2nd condition and 3rd condition is close,while the stress in grouting hole of 2nd condition is more uniform and reasonable.
引文
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[2]台启民,张顶立,房倩,等.暗挖重叠地铁隧道地表变形特性分析[J].岩石力学与工程学报,2014,33(12):2472-2480.TAI Q M,ZHANG D L,FANG Q,et al.Analysis of ground surface deformation induced by excavation of crossing metro tunnels in urban underground[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(12):2472-2480.(in Chinese)
[3]汲广坤.地铁车站深基坑近距离建筑物保护施工技术及措施[J].隧道建设,2011,31(增刊2):120-125.JI G K.Protection technology for construction of deep foundation pit closes to buildings[J].Tunnel Construction,2011,31(S2):120-125.(in Chinese)
[4]吴梦军,李科,刘元雪.隧道基坑穿越建筑桩基保护方案探讨[J].地下空间与工程学报,2016,12(增刊1):312-317.WU M J,LI K,LIU Y X.Protection scheme study of tunnel foundation pit goes through building pile foundation[J].Chinese Journal of Underground Space and Engineering,2016,12(S1):312-317.(in Chinese)
[5]郑凤先.隔离桩对地铁深基坑邻近建筑物保护机理研究[J].城市轨道交通研究,2014,17(3):42-46.ZHENG F X.Protection mechanism of isolation piles to buildings around metro deep excavation[J].Urban Mass Transit,2014,17(3):42-46.(in Chinese)
[6]梁志荣,陈颍,黄开勇.紧邻历史保护建筑深基坑设计实践及监测分析[J].岩土工程学报,2014,36(增刊2):483-488.LIANG Z R,CHEN Y,HUANG K Y.Design practice and monitoring analysis of deep excavations adjacent to protective historic buildings[J].Chinese Journal of Geotechnical Engineering,2014,36(S2):483-488.(in Chinese)
[7]魏焕卫,孙剑平,陈启辉,等.复杂条件下邻近建筑物的保护和基坑支护[J].施工技术,2005,34(6):48-50.WEI H W,SUN J P,CHEN Q H,et al.Adjacent building protection and foundation pit support under complicated conditions[J].Construction Technology,2005,34(6):48-50.(in Chinese)
[8]熊海贝,刘强,康加华,等.基坑围护结构施工对邻近历史保护性建筑物的影响[J].结构工程师,2010,26(3):135-139.XIONG H B,LIU Q,KANG J H,et al.Effect of large and deep foundation pit constructionon on the nearby historic building[J].Structural Engineers,2010,26(3):135-139.(in Chinese)
[9]徐中华,王卫东,王建华.逆作法深基坑对周边保护建筑影响的实测分析[J].土木工程学报,2009,42(10):88-96.XU Z H,WANG W D,WANG J H.Responses of heritage buildings to an adjacent deep excavation using topdown method[J].China Civil Engineering Journal,2009,42(10):88-96.(in Chinese)
[10]丁勇春,程泽坤,王建华,等.深基坑施工对历史建筑的变形影响及控制研究[J].岩土工程学报,2012,34(增刊1):644-648.DING Y C,CHENG Z K,WANG J H,et al.Influence of deep excavation on deformation and control of adjacent historical building[J].Chinese Journal of Geotechnical Engineering,2012,34(Sl):644-648.(in Chinese)
[11]应宏伟,李涛,杨永文,等.深基坑隔断墙保护邻近建筑物的效果与工程应用分析[J].岩土工程学报,2011,33(7):1123-1128.YING H W,LI T,YANG Y W,et al.Effect and application of partition walls in protecting adjacent buildings from deep foundation pits[J].Chinese Journal of Geotechnical Engineering,2011,33(7):1123-1128.(in Chinese)
[12]侯胜男,刘陕南,刘征,等.紧邻深基坑某历史建筑变形实测分析[J].地下空间与工程学报,2011,7(5):977-982.HOU S N,LIU S N,LIU Z,et al.Deformation analysis of historical buildings adjacent to deep excavations[J].Chinese Journal of Underground Space and Engineering,2011,7(5):977-982.(in Chinese)