深基坑大尺寸物理模拟试验与基坑土体变形参数研究
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摘要
基坑工程中土体变形参数的研究对于基坑工程稳定性分析有重要的指示作用.本文基于相似理论的原理和方法,以中央电视台主楼基坑为试验对象,建立模型与实体基坑工程尺寸比例为1∶10的大型物理模型试验.对比物理模拟试验结果与实测资料发现:大型物理模型试验对于基坑开挖土体变形过程有更精确的模拟,其中模型桩顶最大水平位移约为开挖深度的0.32%,实际工况约为1.4%;模型被动土压力随开挖深度的变化规律与实际工况相似,且数值接近.物理模拟的结果与实际工况所检测的结果较为一致,可为实际基坑施工提供依据.
The study of soil deformation parameters in foundation pit engineering plays animportant role in the stability analysis of foundation pit engineering.Based on thetheory and method of similarity theory,this paper takes the pit of CCTV main buildingas the test object and establishes a large-scale physical model test in which the size ratioof the model to the real main building is 1∶10.Compared the physical simulation testresults with the real measured data,it shows that large-scale physical model tests havehigher accuracy in simulating soil deformation process excavated by foundation.Themeasurement of the maximum horizontal displacement of the model's top is about0.32% of that of the excavation depth,and in the real condition the percentage is about1.4%.The trend of passive earth pressure changing with the excavation depth is similarto that of the actual working situations and the actual values of these two conditions areclose to each other.The results of the physical simulation are in good agreement with theresults obtained from actual conditions and can provide evidence for actual pit construction.
The study of soil deformation parameters in foundation pit engineering plays animportant role in the stability analysis of foundation pit engineering.Based on thetheory and method of similarity theory,this paper takes the pit of CCTV main buildingas the test object and establishes a large-scale physical model test in which the size ratioof the model to the real main building is 1∶10.Compared the physical simulation testresults with the real measured data,it shows that large-scale physical model tests havehigher accuracy in simulating soil deformation process excavated by foundation.Themeasurement of the maximum horizontal displacement of the model's top is about0.32% of that of the excavation depth,and in the real condition the percentage is about1.4%.The trend of passive earth pressure changing with the excavation depth is similarto that of the actual working situations and the actual values of these two conditions areclose to each other.The results of the physical simulation are in good agreement with theresults obtained from actual conditions and can provide evidence for actual pit construction.
引文
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[24]李焕强,孙红月,孙新民,等.降雨入渗对边坡性状影响的模型实验研究[J].岩土工程学报,2009,31(4):589-594Li Huanqiang,Sun Hongyue,Sun Xinmin,et al.Influence of rainfall infiltration on slopes by physical model test[J].Chinese Journal of Geotechnical Engineering,2009,31(4):589-594
[25]李国梁,康后金,韩超,等.深基坑大型物理模拟试验土质相似材料的研究[J].公路,2011,(10):184-188Li Guoliang,Kang Houjin,Han Chao,et al.A study on soil similar material of large-scale physical model test of deep pit[J].Highway,2011,(10):184-188
[2]王昆泰,迟铃泉.某基坑事故原因分析及加固设计[J].建筑科学,2017,33(9):116-122Wang Kuntai,Chi Lingquan.Back analysis and remedy design of an accidental excavation[J].Building Science,2017,33(09):116-122
[3]范涛,李宗才.某商业大厦基坑渗透破坏事故分析及抢险加固[J].工业建筑,2016,46(8):158-161Fan Tao,Li Zongcai.Analysis of seepage failure accident for a deep excavation and its dealing with an emergency[J].Industrial Construction,2016,46(8):158-161
[4]薛丽影,杨文生,李荣年.深基坑工程事故原因的分析与探讨[J].岩土工程学报,2013,35(增1):468-473Xue Liying,Yang Wensheng,Li Rongnian.Discussion and analysis of accident reasons of deep foundation pits[J].Chinese Journal of Geotechnical Engineering,2013,35(S1):468-473
[5]王卫东,王建华.深基坑支护结构与主体结构相结合的设计、分析与实例[M].北京:中国建筑工业出版社,2007Wang Weidong,Wang Jianhua.Design,analysis and examples of the combination of support structure and main structure of deep pit[M].Beijing:China Building Industry Press,2007
[6]唐业清,李启民,崔江余.基坑工程事故分析与处理[M].北京:中国建筑工业出版社,1999Tang Yeqing,Li Qiming,Cui Jiangyu.Analysis and treatment of foundation pit engineering accident[M].China Building Industry Press,1999
[7]陈页开.挡土墙上土压力的试验研究与数值分析[D].杭州:浙江大学,2001Chen Yekai.Experimental study and numerical analysis of earth pressure on retaining wall[D].Hangzhou:Zhejiang University,2001
[8]Terzaghi K.Large retaining wall testsⅠ-pressure of dry sand[J].Engineering News Record,1934,112(1):136-140
[9]Terzaghi K.Large retaining wall testsⅡ-pressure of saturated sand[J].Engineering News Record,1934,112(22):259-262
[10]章瑞文.挡土墙主动土压力理论研究[D].杭州:浙江大学,2007Zhang Riwen.Theoretical study on active earth pressure of retaining wall[D].Hangzhou:Zhejiang University,2007
[11]李术才,李利平,李树忱,等.地下工程突涌水物理模拟试验系统的研制及应用[J].采矿与安全工程学报,2010,27(3):299-304Li Shucai,Li Liping,Li Shuchen,et al.Development and application of similar physical model test system for water inrush of underground engineering[J].Journal of Mining and Safety Engineering,2010,27(3):299-304
[12]张向阳,杨科.不同煤层倾角锚杆支护巷道围岩受力特征物理模拟研究[J].煤矿开采,2014,19(2):58-62Zhang Xiangyang,Yang Ke.Physical simulation of surrounding rock stress of roadway supported by anchored bolt with different coal-seam inclined angle[J].Coal Mining Technology,2014,19(2):58-62
[13]Lai X P,Shan P F,Cao J T,et al.Simulation of asymmetric destabilization of mine-void rock masses using a large3Dphysical model[J].Rock Mechanics&Rock Engineering,2016,49(2):487-502
[14]Lai X P,Shan P F,Cai M F,et al.Comprehensive evaluation of high-steep slope stability and optimal high-steep slope design by 3Dphysical modeling[J].International Journal of Minerals Metallurgy and Materials,2015,22(1):1-11
[15]Lin Z,Xu W,Wang W,et al.Determination of strength and deformation properties of columnar jointed rock mass using physical model tests[J].Ksce Journal of Civil Engineering,2018(7):1-10
[16]Sun G,Lin S,Cheng S,et al.Mechanisms of interaction between an arch dam and abutment slope using physical model tests[J].Rock Mechanics&Rock Engineering,2018,51(8):2483-2504
[17]仵锋锋,曹平,万琳辉.相似理论及其在模拟试验中的应用[J].采矿技术,2007,7(4):64-65Wu Fengfeng,Cao Ping,Wan Linhui.Similarity theory and its application in simulation experiments[J].Mining Technology,2007,7(4):64-65
[18]李晓红,卢义玉,康勇,等.岩石力学实验模拟技术[M].北京:科学出版社,2007Li Xiaohong,Lu Yiyu,Kang Yong,et al.Rock mechanics experimental simulation technology[M].Beijing:Science Press,2007
[19]向中富,顾安邦.丹河大桥施工模拟试验研究[J].重庆交通学院学报,2001,20(4):5-10Xiang Zhongfu,Gu Anbang.Simulation test study on the construction of Danhe stone arch bridge[J].Journal of Chongqing Jiaotong University,2001,20(4):5-10
[20]包太,刘新荣,税月.波浪作用下边坡动力反应相似模拟研究[J].港口技术,2004,(4):1-3Bao Tai,Liu Xinrong,Shui Yue.Under wave-induced the simulation test research on slope dynamic response[J].Port Technology,2004,(4):1-3
[21]唐承平,陈宇亮,王惠勇,等.不对称开挖岩质高陡路堑边坡的相似模拟研究[J].中外公路,2004,(3):25-27Tang Chenping,Chen Yuliang,Wang Huiyong,et al.Simulation study of asymmetric excavation rock high and steep cut slope[J].Chinese and Foreign Roads,2004,(3):25-27
[22]肖江,高喜才.复杂地质条件下露天矿边坡稳定的相似模型研究[J].岩石力学与工程学报,2006,25(增2):3661-3666Xiao Jiang,Gao Xicai.Simulation research on stability of open-pit mine slope under complicated geological conditions[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(S2):3661-3666
[23]李丽燕,李利平,王刚.工程岩体突水相似模拟的试验方法研究[J].山西建筑,2008,34(21):101-102Li Liyan,Li Liping,Wang Gang.Similarity theory and method of model ing test for water inrush[J].Shanxi Architecture,2008,34(21):101-102
[24]李焕强,孙红月,孙新民,等.降雨入渗对边坡性状影响的模型实验研究[J].岩土工程学报,2009,31(4):589-594Li Huanqiang,Sun Hongyue,Sun Xinmin,et al.Influence of rainfall infiltration on slopes by physical model test[J].Chinese Journal of Geotechnical Engineering,2009,31(4):589-594
[25]李国梁,康后金,韩超,等.深基坑大型物理模拟试验土质相似材料的研究[J].公路,2011,(10):184-188Li Guoliang,Kang Houjin,Han Chao,et al.A study on soil similar material of large-scale physical model test of deep pit[J].Highway,2011,(10):184-188
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