半刚性半盖挖体系临界施工荷载研究
|
摘要
深基坑半盖挖体系虽在城市轨道交通领域得到广泛应用,但为拓展施工空间,使盖板体系能承载施工及城市交通车辆荷载,梁板式半盖挖体系常演变为半刚性半盖挖体系,目前针对该体系受力与变形特性的理论研究远滞后于工程实践.因此,采用数值分析与现场测试相结合的手段,首次综合考虑盖板刚度、立柱承载力及稳定性、支撑轴力及地连墙变形等因素,对依托工程的半刚性半盖挖体系临界施工荷载及其控制因素开展系统研究.初步得出:依托工程半刚性半盖挖体系围挡内盖板行驶40 t渣土车是安全可行的,其围挡内盖板所能承载的渣土车临界施工荷载为45 t及该渣土车临界施工荷载的控制因素为盖板刚度.该分析结论对半刚性半盖挖体系的设计及施工具有较好的指导作用.
Although the semi-capped excavation system of deep foundation pit has been widely used in the field of urban rail transit,the beam-plate semi-capped excavation system always evolves into a semi-rigid and semi-capped excavation system in order to expand the construction space and enable the cover-plate system to bear the construction and urban traffic vehicle load.However,the present theoretical research on characteristics of the mechanical and deformation of the system is still far behind the engineering practice.By means of numerical analysis and field test,the critical construction load of the semi-rigid and semi-capped excavation system and its control factors are systematically studied for the first time while the factors such as the stiffness of cover plate,the bearing capacity and stability of the column,the supporting axial force and the deformation of diaphragm wall have been taken into account.It can be concluded preliminarily that it is safe and feasible to drive 40 t muck truck with enclosure inner cover plate of the semi-rigid and semi-cover excavation system.The critical construction load of the muck truck is 45 t,and the control factor of the critical construction load of the muck truck is the stiffness of the enclosure inner cover plate.The conclusion can be used to guide the design and construction of the semi-rigid and semi-capped excavation system.
Although the semi-capped excavation system of deep foundation pit has been widely used in the field of urban rail transit,the beam-plate semi-capped excavation system always evolves into a semi-rigid and semi-capped excavation system in order to expand the construction space and enable the cover-plate system to bear the construction and urban traffic vehicle load.However,the present theoretical research on characteristics of the mechanical and deformation of the system is still far behind the engineering practice.By means of numerical analysis and field test,the critical construction load of the semi-rigid and semi-capped excavation system and its control factors are systematically studied for the first time while the factors such as the stiffness of cover plate,the bearing capacity and stability of the column,the supporting axial force and the deformation of diaphragm wall have been taken into account.It can be concluded preliminarily that it is safe and feasible to drive 40 t muck truck with enclosure inner cover plate of the semi-rigid and semi-cover excavation system.The critical construction load of the muck truck is 45 t,and the control factor of the critical construction load of the muck truck is the stiffness of the enclosure inner cover plate.The conclusion can be used to guide the design and construction of the semi-rigid and semi-capped excavation system.
引文
[1] 王志红.北京地铁平乐园站盖挖逆筑深基坑设计[J].岩土工程学报,2012,34(增刊1):699-704.
[2] 陈艳茹,杨勃.基于半幅铺盖法的地铁站施工中铺盖体系稳定性分析[J].施工技术,2016,45(11):72-75.
[3] 黄云龙.某地铁车站深大基坑支护结构受力分析[J].兰州交通大学学报,2016,35(3):45-51.
[4] 何海鹏,杨有海.兰州某基坑变形监测与数值模拟[J].兰州交通大学学报,2015,34(6):38-44+54.
[5] 叶帅华,丁盛环,龚晓南,等.兰州某地铁车站深基坑监测与数值模拟分析[J].岩土工程学报,2018,40(增刊1):177-182.
[6] 董志航,侯越,王冰琰.基于回归分析的地铁施工地表沉降预测模型研究[J].兰州交通大学学报,2016,35(4):30-33.
[7] 周勇,叶炜钠,高升.兰州地铁某车站深基坑开挖变形特性分析[J].岩土工程学报,2018,40(增刊1):141-146.
[8] 王占生,濮仕坤,李文峰,等.地铁车站半盖挖顺作施工的时空效应分析[J].建筑施工,2017,39(12):1856-1859.
[9] 刘五一,肖育斐,张健,等.紧邻高边坡地铁深基坑半盖挖施工技术[J].施工技术,2019,48(3):76-79.
[10] 杨华伟.软土地区地铁车站半盖挖法施工技术[J].施工技术,2013,42(7):30-33.
[11] 刘素锦,郭明伟,李兆源,等.浅析车辆荷载对深基坑支护结构的影响[J].地下空间与工程学报,2009,5(1):105-107,157.
[12] 余新昊.车辆荷载作用下软土深基坑被动区水泥土加固的力学行为分析[D].成都:西南石油大学,2015.
[13] 中华人民共和国建设部.城市桥梁设计荷载标准:CJJ 77-1998[S].北京:中国建筑工业出版社,1998.
[14] 中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.钢结构设计标准:GB 50017-2017[S].北京:中国建筑工业出版社,2018.
[15] 中华人民共和国住房和城乡建设部.城市轨道交通工程监测技术规范:GB 50911-2013[S].北京:中国建筑工业出版社,2013.
[2] 陈艳茹,杨勃.基于半幅铺盖法的地铁站施工中铺盖体系稳定性分析[J].施工技术,2016,45(11):72-75.
[3] 黄云龙.某地铁车站深大基坑支护结构受力分析[J].兰州交通大学学报,2016,35(3):45-51.
[4] 何海鹏,杨有海.兰州某基坑变形监测与数值模拟[J].兰州交通大学学报,2015,34(6):38-44+54.
[5] 叶帅华,丁盛环,龚晓南,等.兰州某地铁车站深基坑监测与数值模拟分析[J].岩土工程学报,2018,40(增刊1):177-182.
[6] 董志航,侯越,王冰琰.基于回归分析的地铁施工地表沉降预测模型研究[J].兰州交通大学学报,2016,35(4):30-33.
[7] 周勇,叶炜钠,高升.兰州地铁某车站深基坑开挖变形特性分析[J].岩土工程学报,2018,40(增刊1):141-146.
[8] 王占生,濮仕坤,李文峰,等.地铁车站半盖挖顺作施工的时空效应分析[J].建筑施工,2017,39(12):1856-1859.
[9] 刘五一,肖育斐,张健,等.紧邻高边坡地铁深基坑半盖挖施工技术[J].施工技术,2019,48(3):76-79.
[10] 杨华伟.软土地区地铁车站半盖挖法施工技术[J].施工技术,2013,42(7):30-33.
[11] 刘素锦,郭明伟,李兆源,等.浅析车辆荷载对深基坑支护结构的影响[J].地下空间与工程学报,2009,5(1):105-107,157.
[12] 余新昊.车辆荷载作用下软土深基坑被动区水泥土加固的力学行为分析[D].成都:西南石油大学,2015.
[13] 中华人民共和国建设部.城市桥梁设计荷载标准:CJJ 77-1998[S].北京:中国建筑工业出版社,1998.
[14] 中华人民共和国住房和城乡建设部,中华人民共和国国家质量监督检验检疫总局.钢结构设计标准:GB 50017-2017[S].北京:中国建筑工业出版社,2018.
[15] 中华人民共和国住房和城乡建设部.城市轨道交通工程监测技术规范:GB 50911-2013[S].北京:中国建筑工业出版社,2013.