建筑物掏土纠倾法孔周土压力和破坏特性试验研究
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摘要
掏土孔孔周土受力与变形以及破坏模式是建筑物纠倾研究的关键问题,影响纠倾设计中掏土孔直径及掏土孔间距等参数的确定。为了研究建筑物掏土纠倾法掏土孔周土压力变化、掏土孔破坏模式以及地基的沉降情况,设计并制作了可用于模拟掏土纠倾的模型箱,对掏土孔直径为200 mm,孔间距分别为400、600、800 mm的纠倾模型进行试验,分析了由于掏土孔开挖引起的地基土沉降及倾斜率。研究结果表明:掏土孔的破坏呈现立式椭圆、卧式椭圆及近似圆形三种破坏模式;通过孔侧和孔上部压力的变化,发现孔周土压力发生转移,从孔上部土压力向孔侧边土体转移,孔顶土压力减小,孔侧土压力增加,形成土拱效应;随着孔间距增加,土体形成稳定拱脚,从而不利于纠倾工程回倾;通过试验结果,建议孔间距为2～3倍掏土孔直径。
In the design of building rectification process,the stress,the deformation and the failure mode of the excavation holes are the key problems.They affect the determination of the key design parameters such as the diameter and spacing of excavation holes etc.In this regard,some model experiments were carried out to study the soil pressure variation around the holes,the failure mode of the excavation hole and the soil settlement after excavation.A simulation model box was designed and made to simulate the soil excavation.The soil excavation was then done with the hole diameter of 200 mm;three cases with the hole spacing of 400 mm,600 mm,and 800 mm,respectively,were considered.The soil settlement and tilt ratio due to the excavation holes were analyzed.The results show that there are three failure modes of the excavation holes:vertical irregular oval,horizontal irregular oval,and irregular circle.Further,it is found that the soil pressure transfers from above the hole to the side of the hole,which accords with the soil arching effect.Furthermore,it is found that with the increase of hole spacing,the soil between the holes forms a steady arching foot,which is unfavorable to the building rectification.It is suggested based on the test results that the proper hole spacing should be 2-3 times of the hole diameter.
In the design of building rectification process,the stress,the deformation and the failure mode of the excavation holes are the key problems.They affect the determination of the key design parameters such as the diameter and spacing of excavation holes etc.In this regard,some model experiments were carried out to study the soil pressure variation around the holes,the failure mode of the excavation hole and the soil settlement after excavation.A simulation model box was designed and made to simulate the soil excavation.The soil excavation was then done with the hole diameter of 200 mm;three cases with the hole spacing of 400 mm,600 mm,and 800 mm,respectively,were considered.The soil settlement and tilt ratio due to the excavation holes were analyzed.The results show that there are three failure modes of the excavation holes:vertical irregular oval,horizontal irregular oval,and irregular circle.Further,it is found that the soil pressure transfers from above the hole to the side of the hole,which accords with the soil arching effect.Furthermore,it is found that with the increase of hole spacing,the soil between the holes forms a steady arching foot,which is unfavorable to the building rectification.It is suggested based on the test results that the proper hole spacing should be 2-3 times of the hole diameter.
引文
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[13]邓正定,孙琪,王珑,张三福.止倾迫降综合纠倾法机理分析及在高层建筑纠偏中的应用[J].铁道建筑,2016(2):116-120.(DENG Zhengding,SUN Qi,WANG Long,ZHANG Sanfu.Mechanism analysis of integrated incline-rectifying and forced settlement rectification method and its application to high-rise building rectification[J].Railway Engineering,2016(2):116-120.(in Chinese))
[14]张贵文,朱彦鹏,衡涛,罗维刚,宋彧.湿陷性黄土地基应力解除法迫降纠倾试验研究[J].建筑科学,2007,23(3):38-42.(ZHANG Guiwen,ZHUYanpeng,HENG Tao,LUO Weigang,SONG Yu.Experimental study on forced settlement rectification through stress relieving method in collapsible loess regions[J].Building Science,2007,23(3):38-42.(in Chinese))
[15]吴宏伟,徐光明.地基应力解除法纠偏机理的离心模型试验研究[J].岩土工程学报,2003,25(3):299-303.(WU Hongwei,XU Guangming.In-flight centrifuge modeling of vertical relief boring technique[J].Chinese Journal of Geotechnical Engineering,2003,25(3):299-303.(in Chinese))
[16]贾强,王浩东,李成龙,张鑫,邵鹍.一种地下工程试验用模型箱的设计和制作[J].土工基础,2017,31(1):112-114.(JIA Qiang,WANG Haodong,LIChenglong,ZHANG Xin,SHAO Kun.Design and manufacture of a model test box for the underground space and engineering[J].Soil Engineering and Foundation,2017,31(1):112-114.(in Chinese))
[17]TERZAGHI K.Theoretical soil mechanics[M].New York:John Wiley and Sons,1943:66-76.
[2]孙剑平,魏焕卫,徐向东.掏土纠倾法的理论和实践研究[J].山东建筑大学学报,2008,23(2):174-177.(SUN Jianping,WEI Huanwei,XU Xiangdong.The practice and theoretical study of digging-out-soil correction[J].Journal of Shandong Jianzhu University,2008,23(2):174-177.(in Chinese))
[3]唐业清.建筑物纠倾新技术[J].建筑技术,1995,22(6):323-327.
[4]张鑫,陈云娟,岳庆霞,郭道通.建筑物纠倾技术及其工程应用[J].山东建筑大学学报,2016,31(6):599-605.(ZHANG Xin,CHEN Yunjuan,YUEQingxia,GUO Daotong.Building’s incline-rectifying technology and its application[J].Journal of Shandong Jianzhu University,2016,31(6):599-605.(in Chinese))
[5]陈玉清.建筑物掏土纠倾技术影响因素分析与研究[D].济南:山东建筑大学,2014:35-38.(CHENYuqing.Analysis and research on influence factors of soil correction technique for buildings[D].Jinan:Shandong Jianzhu University,2014:35-38.(in Chinese))
[6]杨凡.建筑物掏土纠倾的三维模型分析与应用研究[D].济南:山东建筑大学,2015:28-60.(YANGFan.Analysis and applied research of rectifying technology for building by drawing out soil[D].Jinan:Shandong Jianzhu University,2015:28-60.(in Chinese))
[7]徐向东,贾留东,孙剑平,等.建筑物基底掏土灌水法纠倾:设计方法与工程实例[J].建筑结构学报,1999,20(5):59-65.(XU Xiangdong,JIA Liudong,SUN Jianping,et al.Design and practice of rectifying leaning building by digging-out soil and filling-in with water method[J].Journal of Building Structures,1999,20(5):59-65.(in Chinese))
[8]王运栋.掏土纠倾法作用机理的分析研究[D].北京:北京交通大学,2009:37-41.(WANG Yundong.Analysis on the action mechanics of correcting buildings with the method of drawing out soil[D].Beijing:Beijing Jiaotong University,2009:37-41.(in Chinese))
[9]宋彧,孔淑臻,王向阳.低应力地基弱刚度砖混结构迫降纠倾理论与实践[J].兰州理工大学学报,2011,37(1):106-110.(SONG Yu,KONG Shuzhen,WANG Xiangyang.Theory and practice of forced settlement rectification for weak rigidity masonry building on low-stress foundation[J].Journal of Lanzhou University of Technology,2011,37(1):106-110.(in Chinese))
[10]陈森.基于桩式托换的既有建筑掏土纠偏技术研究[D].西安:西安建筑科技大学,2017:20-24.(CHENSen.Study on deviation rectification technology of existing building excavation based on pile underpinning[D].Xi’an:Xi’an University of Architecture and Technology,2017:20-24.(in Chinese))
[11]陈云娟,张鑫,郭道通,邓详文.基于鲁宾涅特解的建筑物掏土纠倾孔周土塑性区计算[J].建筑结构学报,2018,39(2):168-173.(CHEN Yunjuan,ZHANGXin,GUO Daotong,DENG Xiangwen.Calculation on surrounding soil’s plastic zone in building’s soildigging incline-rectifying process[J].Journal of Building Structures,2018,39(2):168-173.(in Chinese))
[12]邓正定,张小兵,王珑.水平掏土迫降纠倾法机理分析及计算方法[J].土木工程与管理学报,2016,33(5):38-43.(DENG Zhengding,ZHANG Xiaobing,WANG Long.Mechanism analysis and calculation method of horizontal soil landing rectifying method[J].Journal of Civil Engineering and Management,2016,33(5):38-43.(in Chinese))
[13]邓正定,孙琪,王珑,张三福.止倾迫降综合纠倾法机理分析及在高层建筑纠偏中的应用[J].铁道建筑,2016(2):116-120.(DENG Zhengding,SUN Qi,WANG Long,ZHANG Sanfu.Mechanism analysis of integrated incline-rectifying and forced settlement rectification method and its application to high-rise building rectification[J].Railway Engineering,2016(2):116-120.(in Chinese))
[14]张贵文,朱彦鹏,衡涛,罗维刚,宋彧.湿陷性黄土地基应力解除法迫降纠倾试验研究[J].建筑科学,2007,23(3):38-42.(ZHANG Guiwen,ZHUYanpeng,HENG Tao,LUO Weigang,SONG Yu.Experimental study on forced settlement rectification through stress relieving method in collapsible loess regions[J].Building Science,2007,23(3):38-42.(in Chinese))
[15]吴宏伟,徐光明.地基应力解除法纠偏机理的离心模型试验研究[J].岩土工程学报,2003,25(3):299-303.(WU Hongwei,XU Guangming.In-flight centrifuge modeling of vertical relief boring technique[J].Chinese Journal of Geotechnical Engineering,2003,25(3):299-303.(in Chinese))
[16]贾强,王浩东,李成龙,张鑫,邵鹍.一种地下工程试验用模型箱的设计和制作[J].土工基础,2017,31(1):112-114.(JIA Qiang,WANG Haodong,LIChenglong,ZHANG Xin,SHAO Kun.Design and manufacture of a model test box for the underground space and engineering[J].Soil Engineering and Foundation,2017,31(1):112-114.(in Chinese))
[17]TERZAGHI K.Theoretical soil mechanics[M].New York:John Wiley and Sons,1943:66-76.