被动区土体加固对深基坑变形影响的研究
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摘要
被动区土体加固能有效地控制基坑开挖引起的变形、保护基坑周边环境,在实际工程中得到广泛的应用。对上海软土地区某地铁车站深基坑工程进行数值模拟,系统地研究了不同土体加固形式对基坑变形的影响。研究结果表明:该工程采取的坑底加固措施使得基坑变形满足变形控制标准;增大土体加固的深度能显著地减小围护结构侧向位移、地表沉降和坑底隆起;而过度地增大加固土体的割线模量E_(50)~(ref)对控制基坑变形的效果甚微;在同等条件下,满堂加固控制基坑变形的能力明显优于裙边加固。
The deformation behaviors of deep excavation and its adverse impact on surrounding environment could be effectively controlled by reinforcement in the passive zone which is widely applied in actual projects.With a deep excavation for the metro station in Shanghai soft soil area as research background,the impact of reinforcement in passive zone on excavation-induced deformation was investigated by numerical simulations.Results showed that by reinforcement in passive zone,the magnitude of deformations could meet control requirements.With the increase of reinforced depth,deformations such as lateral wall deflection,ground settlement and bottom upheaval could be effectively controlled;but excessive improvement on the magnitude of E50 reffor reinforced soil had little impact.The effect of controlling excavation deformation by reinforcement of entire basal soil is obviously superior to that by reinforcement along the diaphragm wall under equal condition.
The deformation behaviors of deep excavation and its adverse impact on surrounding environment could be effectively controlled by reinforcement in the passive zone which is widely applied in actual projects.With a deep excavation for the metro station in Shanghai soft soil area as research background,the impact of reinforcement in passive zone on excavation-induced deformation was investigated by numerical simulations.Results showed that by reinforcement in passive zone,the magnitude of deformations could meet control requirements.With the increase of reinforced depth,deformations such as lateral wall deflection,ground settlement and bottom upheaval could be effectively controlled;but excessive improvement on the magnitude of E50 reffor reinforced soil had little impact.The effect of controlling excavation deformation by reinforcement of entire basal soil is obviously superior to that by reinforcement along the diaphragm wall under equal condition.
引文
[1]汤瑞,王强,宫保聚,等.不同施工工序对围护结构及周边环境的影响[J].长江科学院院报,2016,33(3):60-64.
[2]丁洪元,昌钰,陈斌.软土深基坑双排桩支护结构的影响因素分析[J].长江科学院院报,2015,32(5):105-109.
[3]秦爱芳,李永圃,陈有亮.上海地区基坑工程中的注浆加固研究[J].土木工程学报,2000,33(1):69-72.
[4]黄宏伟.深基坑内加固与墙体侧向位移的相互影响实测分析[J].建筑结构,2000,30(11):55-57.
[5]陈兴年,刘国彬,王忠远.关于软土基坑加固的一点看法[J].地下空间,2003,22(1):79-86.
[6]贾坚.土体加固技术在基坑开挖工程中的应用[J].地下空间与工程学报,2007,3(1):132-137.
[7]秦爱芳,胡中雄,彭世娟.上海软土地区受卸荷影响的基坑工程被动区土体加固深度研究[J].岩土工程学报,2008,30(6):935-940.
[8]蒋建平.深基坑坑底加固体的刚度效应研究[J].工程力学,2011,28(6):130-140.
[9]熊春宝,高鹏,田力耘,等.不同坑底加固方式对深基坑变形影响的研究[J].建筑科技,2015,46(6):486-490.
[10]屈若枫,马郧,徐光黎,等.基坑被动区阶梯式加固尺寸对桩位移影响分析[J].长江科学院院报,2013,30(7):86-90.
[11]朱志祥,刘少炜,刘新荣,等.某地铁车站软土深基坑加固效果研究[J].地下空间与工程学报,2014,10(3):716-720.
[12]TAN Yong,WEI Bin.Observed Behaviors of a Long and Deep Excavation Constructed by Cut-and-cover Technique in Shanghai Soft Clay[J].Journal of Geotechnical and Geoenvironmental Engineering,2012,138(1):69-88.
[13]王卫东,王浩然,徐中华.上海地区基坑开挖数值分析中土体HS-Small模型参数的研究[J].岩土力学,2013,34(6):1766-1774.
[14]侯新宇,刘松玉,童立元.被动区深搅桩加固对地铁深基坑变形的影响[J].东南大学学报,2010,40(1):180-184.
[2]丁洪元,昌钰,陈斌.软土深基坑双排桩支护结构的影响因素分析[J].长江科学院院报,2015,32(5):105-109.
[3]秦爱芳,李永圃,陈有亮.上海地区基坑工程中的注浆加固研究[J].土木工程学报,2000,33(1):69-72.
[4]黄宏伟.深基坑内加固与墙体侧向位移的相互影响实测分析[J].建筑结构,2000,30(11):55-57.
[5]陈兴年,刘国彬,王忠远.关于软土基坑加固的一点看法[J].地下空间,2003,22(1):79-86.
[6]贾坚.土体加固技术在基坑开挖工程中的应用[J].地下空间与工程学报,2007,3(1):132-137.
[7]秦爱芳,胡中雄,彭世娟.上海软土地区受卸荷影响的基坑工程被动区土体加固深度研究[J].岩土工程学报,2008,30(6):935-940.
[8]蒋建平.深基坑坑底加固体的刚度效应研究[J].工程力学,2011,28(6):130-140.
[9]熊春宝,高鹏,田力耘,等.不同坑底加固方式对深基坑变形影响的研究[J].建筑科技,2015,46(6):486-490.
[10]屈若枫,马郧,徐光黎,等.基坑被动区阶梯式加固尺寸对桩位移影响分析[J].长江科学院院报,2013,30(7):86-90.
[11]朱志祥,刘少炜,刘新荣,等.某地铁车站软土深基坑加固效果研究[J].地下空间与工程学报,2014,10(3):716-720.
[12]TAN Yong,WEI Bin.Observed Behaviors of a Long and Deep Excavation Constructed by Cut-and-cover Technique in Shanghai Soft Clay[J].Journal of Geotechnical and Geoenvironmental Engineering,2012,138(1):69-88.
[13]王卫东,王浩然,徐中华.上海地区基坑开挖数值分析中土体HS-Small模型参数的研究[J].岩土力学,2013,34(6):1766-1774.
[14]侯新宇,刘松玉,童立元.被动区深搅桩加固对地铁深基坑变形的影响[J].东南大学学报,2010,40(1):180-184.