深厚冲积层冻结井筒外层井壁结构可靠性分析
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摘要
双层高强钢筋混凝土井壁是我国深厚表土层冻结法凿井中的主要支护结构,为了优化冻结井筒高强井壁可靠性设计,采用概率极限状态设计方法替代传统的容许应力设计法,以丁集矿副井外层井壁501 m层位为研究对象,用ANSYS有限元程序对深厚冲积层冻结井筒外层井壁结构的可靠性进行分析。结果表明:有限元模拟得出该层位外壁的可靠性指标为2.98,与JC法理论计算结果基本相符。外层井壁可靠性影响因素按重要程度依次为冻结压力、混凝土轴心抗压强度、厚径比和配筋率。
Double high strength reinforced concrete wall is main support structure for deep surface soil freezing drilling in China.In this study, probability limit state design method is proposed to replace allowable stress design method in order to optimize the reliability design of high strength shaft lining in freezing shaft. Taking 501 m of outer sidewall of Dingji auxiliary well as the research object, the reliability of outer sidewall structure of deep alluvial frozen wellbore was analyzed by ANSYS finite element program. The results show that the reliability index of the coal mine at this depth is 2.98 and there is almost no difference between value of theoretical calculation and finite element simulation analysis. The importance for influence factors of outer shaft wall reliability from the large to the small is freezing pressure, axial compression strength of concrete, thickness-to-radius ratio and reinforcement ratio according to sensitivity analysis in ANSYS software.
Double high strength reinforced concrete wall is main support structure for deep surface soil freezing drilling in China.In this study, probability limit state design method is proposed to replace allowable stress design method in order to optimize the reliability design of high strength shaft lining in freezing shaft. Taking 501 m of outer sidewall of Dingji auxiliary well as the research object, the reliability of outer sidewall structure of deep alluvial frozen wellbore was analyzed by ANSYS finite element program. The results show that the reliability index of the coal mine at this depth is 2.98 and there is almost no difference between value of theoretical calculation and finite element simulation analysis. The importance for influence factors of outer shaft wall reliability from the large to the small is freezing pressure, axial compression strength of concrete, thickness-to-radius ratio and reinforcement ratio according to sensitivity analysis in ANSYS software.
引文
[1]程桦.深厚冲积层冻结法凿井理论与技术[M].北京:科学出版社,2016:1-30.
[2]蔡海兵,程桦,姚直书,等.深厚表土层冻结外层井壁受力状况的监测及分析[J].煤炭科学技术,2009,37(2):38-41.
[3]程桦,蔡海兵.我国深立井冻结法凿井安全现状与思考[J].安徽理工大学学报(自然科学版),2013,33(2):1-6.
[4]GB 50384-2016煤矿立井井筒及硐室设计规范[S].
[5]张荣立,何国纬,李铎.采矿工程设计手册[M].北京:煤炭工业出版社,2002:1605-1610.
[6]李明顺.工程结构可靠度设计统一标准及概率极限状态设计方法概述[J].建筑科学,1992(2):3-7.
[7]沈其明,邓和平.结构设计中的容许应力法和概率极限状态设计法[J].重庆交通学院学报,1985(2):12.
[8]谢楠,付小辉,王立峰,等.扣件式高大模板支架的概率极限状态设计法研究[J].工程力学,2016,33(10):68-75.
[9]魏新欣,丁文其.公路隧道概率极限状态设计方法[J].公路交通科技,2011,28(10):75-79.
[10]赵万强,李磊,王政栋,等.铁路隧道复合式衬砌极限状态设计研究[J].铁道工程学报,2015(6):62-68.
[11]刘全林,孙文若,杨俊杰,等.冻结井钢筋混凝土井壁结构的概率极限状态设计[J].煤炭工程,1995(9):6-9.
[12]孙林柱,杨俊杰.双层钢筋混凝土冻结井井壁结构可靠度分析[J].建井技术,1997(3):17-21.
[13]杨俊杰.深厚表土地层条件下的立井井壁结构[M].北京:科学出版社,2010:135-144.
[14]吴世伟.结构可靠性分析[M].北京:人民交通出版社,1990:114-115.
[15]姚亚锋,程桦,黎明镜,等.深厚冲积层钢筋混凝土外层井壁结构模糊随机有限元可靠性及灵敏度分析[J].煤炭学报,2016,41(12):3032-3039.
[16]杨超,高谦,钟海滨.基于ANSYS的可靠度分析方法及应用[J].中国安全生产科学技术,2012,8(7):139-142.
[2]蔡海兵,程桦,姚直书,等.深厚表土层冻结外层井壁受力状况的监测及分析[J].煤炭科学技术,2009,37(2):38-41.
[3]程桦,蔡海兵.我国深立井冻结法凿井安全现状与思考[J].安徽理工大学学报(自然科学版),2013,33(2):1-6.
[4]GB 50384-2016煤矿立井井筒及硐室设计规范[S].
[5]张荣立,何国纬,李铎.采矿工程设计手册[M].北京:煤炭工业出版社,2002:1605-1610.
[6]李明顺.工程结构可靠度设计统一标准及概率极限状态设计方法概述[J].建筑科学,1992(2):3-7.
[7]沈其明,邓和平.结构设计中的容许应力法和概率极限状态设计法[J].重庆交通学院学报,1985(2):12.
[8]谢楠,付小辉,王立峰,等.扣件式高大模板支架的概率极限状态设计法研究[J].工程力学,2016,33(10):68-75.
[9]魏新欣,丁文其.公路隧道概率极限状态设计方法[J].公路交通科技,2011,28(10):75-79.
[10]赵万强,李磊,王政栋,等.铁路隧道复合式衬砌极限状态设计研究[J].铁道工程学报,2015(6):62-68.
[11]刘全林,孙文若,杨俊杰,等.冻结井钢筋混凝土井壁结构的概率极限状态设计[J].煤炭工程,1995(9):6-9.
[12]孙林柱,杨俊杰.双层钢筋混凝土冻结井井壁结构可靠度分析[J].建井技术,1997(3):17-21.
[13]杨俊杰.深厚表土地层条件下的立井井壁结构[M].北京:科学出版社,2010:135-144.
[14]吴世伟.结构可靠性分析[M].北京:人民交通出版社,1990:114-115.
[15]姚亚锋,程桦,黎明镜,等.深厚冲积层钢筋混凝土外层井壁结构模糊随机有限元可靠性及灵敏度分析[J].煤炭学报,2016,41(12):3032-3039.
[16]杨超,高谦,钟海滨.基于ANSYS的可靠度分析方法及应用[J].中国安全生产科学技术,2012,8(7):139-142.