地下水封石洞油库锚喷支护结构承载特性分析
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摘要
洞库锚喷支护体系的应力分析及围岩与喷射混凝土的联合承载是地下水封石油洞库开挖支护的重点关注对象。基于ANSYS有限元计算软件模拟了地下洞室的开挖,研究了洞室的变形稳定和支护体系的受力状况,并引入薄层单元考虑洞室围岩与喷射混凝土的粘结强度,探讨了喷射混凝土与围岩的工作状态。研究表明:由于洞库围岩完整性好、强度高,地下洞室围岩变形较小,且以线弹性变形为主,为安全考虑宜及时完成支护,防止局部受节理裂隙面影响出现掉块现象。敏感性分析表明,在水幕压力作用下,当粘结强度<0.6 MPa时,在边墙部位开始出现喷射混凝土脱离,当粘结强度<0.5 MPa时,大部分出现脱离现象,因此需要注意喷射混凝土施工质量,加大现场粘结强度试验检测。
The stress of support system and the load-bearing characteristics between shotcrete and rock are research focuses in the excavation of underground oil storage in rock caverns. In this paper, the deformation and stability of cavern and the stress condition of the support system are studied though simulating the excavation of underground caverns by finite element software ANSYS. Furthermore, the work condition of shotcrete and rock is discussed by incorporating thin layer element in the simulation with the bond strength between surrounding rock mass and shotcrete into consideration. Research reveals that the deformation of surrounding rock is relatively small with linear elastic deformation due to good integrity and high strength. The support system should be completed in time to prevent from local falling resulting from joints. Sensitivity analysis shows that under the action of water pressure, when the bond strength between surrounding rock and shotcrete is less than 0.6 MPa, shotcrete begins to separate from the side walls, and when bond strength is less than 0.5 MPa, more separated area appear even in the vaults. Therefore the construction quality of shotcrete should be noted and field adhesion test should be intensified.
The stress of support system and the load-bearing characteristics between shotcrete and rock are research focuses in the excavation of underground oil storage in rock caverns. In this paper, the deformation and stability of cavern and the stress condition of the support system are studied though simulating the excavation of underground caverns by finite element software ANSYS. Furthermore, the work condition of shotcrete and rock is discussed by incorporating thin layer element in the simulation with the bond strength between surrounding rock mass and shotcrete into consideration. Research reveals that the deformation of surrounding rock is relatively small with linear elastic deformation due to good integrity and high strength. The support system should be completed in time to prevent from local falling resulting from joints. Sensitivity analysis shows that under the action of water pressure, when the bond strength between surrounding rock and shotcrete is less than 0.6 MPa, shotcrete begins to separate from the side walls, and when bond strength is less than 0.5 MPa, more separated area appear even in the vaults. Therefore the construction quality of shotcrete should be noted and field adhesion test should be intensified.
引文
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[2] 李仲奎,刘辉,曾利,等.不衬砌地下洞室在能源储存中的作用与问题[J].地下空间与工程学报,2005,1(3):350-357.
[3] 张文辉,赵晓,高志华,等.首座国家大型地下水封石洞油库工程施工创新技术[J].长江科学院院报,2014,31(1):92-97.
[4] 胡谋鹏,梁久正.地下水封储油库围岩稳定性数值分析[J].油气储运,2013,39(3):17-20.
[5] 王金国.地下水封石油洞库围岩稳定性三位数值分析[J].油气田地面工程,2017,36(8):46-49.
[6] 张奇华.黄岛国家石油储备地下水封洞库水幕系统建造关键技术研究[R].武汉:长江科学院,2014.
[7] 王芝银,李云鹏,郭书太,等.大型地下储油洞粘弹性稳定性分析[J].岩土力学,2005,26(11):1705-1710.
[8] 陈祥.黄岛地下水封石油洞库岩体质量评价及围岩稳定性分析[D].北京:中国地质大学,2007.
[9] 张奇华.关于黄岛国家石油储备库水封效果评价和控制的几点认识[J].长江科学院院报,2014,31(8):112-116.
[10] 王钧.大型地下水封原油洞库高性能能喷射混凝土研究与应用[D].济南:山东大学,2014.
[11] 陈明祥.弹塑性力学[M].北京:科学出版社,2010.
[12] 苏凯,伍鹤皋,蒋逵超,等.不同支护时机的地下洞室围岩稳定仿真[J].武汉大学学报(工学版),2008,41(4):29-33.
[13] 苏凯,向前,李万军.官地水电站右岸施工导流洞进口塌方段衬砌结构安全[J].武汉大学学报(工学版),2012,45(3):290-295.
[14] 苏凯,周元,谢颖涵,等.欠挖条件下导流洞衬砌结构应力应变分析[J].水电能源科学,2012,30(5):73-76.
[15] 苏凯,周亚峰,程宵.水工隧道检修期衬砌与围岩联合承载作用机理[J].武汉大学学报(工学版),2012,45(3):301-304.
[16] GB 50086—2015,锚杆喷射混凝土支护技术规范[S].北京:中国计划出版社,2016.
[17] 黄国兴,刘燕波,柳华英,等.对喷射混凝土与围岩黏结强度检测方法的评价[J].水利学报,2010,41(11):1382-1386.