圆形巷道掌子面推进围岩应力变化规律研究
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摘要
洞室围岩中主应力随掌子面推进过程动态发展变化的研究较为少见。假定了三种较为常见的初始应力场分布特征,利用FLAC3D数值模拟软件,研究分析了圆形洞室洞壁围岩应力随掌子面推进过程的变化特征。研究结果表明:围岩二次应力场中主应力变化发展规律与初始地应力场相关。不同组合下主应力表现不同变化特征。掌子面推进过程中主应力主要于一倍洞径范围内动态变化,这一范围亦为洞室临时支护及其他工程措施的关键部位。洞轴与最大初始主应力平行情况最有利于洞室稳定。研究结果可为地下工程支护设计及支护等措施施加时机选择提供一定的参考。
There are few researches on the dynamic variation of the stress in the rock mass surrounding the tunnel while excavation face advancing.Three general in-situ stress case is supposed.The FLAC3D numerical simulation software is utilized.The dynamic variation of the magnitude of surrounding rock stress while tunnel face advancing is detailed studied.Conclusions can be drawn as follows: the redistribution of the stress have some connection with the characteristic of the in-situ geostress,the rule of stress variation will be different in the different in-situ stress combination,the extension of the stress variation is equal to the diameter of the excavation almost.The extension is import to the temporary supporting and other measures selecting,the maximum in-situ stress parallel to the axis of the excavation is the most favorable to the stability of the excavation.The investigation can provide an effective way for the design of the support and the selection of the support design opportunity.
There are few researches on the dynamic variation of the stress in the rock mass surrounding the tunnel while excavation face advancing.Three general in-situ stress case is supposed.The FLAC3D numerical simulation software is utilized.The dynamic variation of the magnitude of surrounding rock stress while tunnel face advancing is detailed studied.Conclusions can be drawn as follows: the redistribution of the stress have some connection with the characteristic of the in-situ geostress,the rule of stress variation will be different in the different in-situ stress combination,the extension of the stress variation is equal to the diameter of the excavation almost.The extension is import to the temporary supporting and other measures selecting,the maximum in-situ stress parallel to the axis of the excavation is the most favorable to the stability of the excavation.The investigation can provide an effective way for the design of the support and the selection of the support design opportunity.
引文
1徐志英.岩石力学(第三版).北京:中国水利水电科学出版社,1993
2 Hoek E,Brown E T.Underground excavations in rock.London:TheInstitution of Mining and Metallurgy,1980
3 Hoek,E,Kaiser P K,Bawden W F.Support of underground excava-tions in hard rock.Rotterdam:A.A.Balkema,1995
4刘立鹏,姚磊华,王成虎,等.地应力对脆性岩体洞群稳定性的影响.中南大学学报(自然科学版),2010;41(2):709—714
5 Eberhard T.Numerical modelling of three-dimension stress rotationahead of an advancing tunnel face.International Journal of Rock Me-chanics and Mining Sciences,2001;38(4):499—518
6 Moriyaa H,Fujita T,Niitsuma H,et al.Analysis of fracture propa-gation behavior using hydraulically induced acoustic emissions in theBernburg salt mine,Germany.International Journal of Rock Mechan-ics and Mining Sciences,2006;43(1):49—57
7 Brown E T,Hoek E.Technical note trends in relationships betweenmeasured in-situ stress and depth.International Journal of Rock Me-chanics and Mining Science&Geomechanics Abstracts,1978,15(4):211—215
8朱焕春,陶振宇.不同岩石中地应力分布.地震学报,1994,16(1):49—63
9赵德安,陈志敏,蔡小林,等.中国地应力场分布规律统计分析.岩石力学与工程学报,2007;26(6):1265—1271
10景锋,盛谦,张勇慧,等.中国大陆浅层地壳实测地应力分布规律研究.岩石力学与工程学报,2007;26(10):2056—2062
11刘宁,张春生,陈祥荣,等.深埋隧洞开挖围岩应力演化过程监测及特征研究.岩石力学与工程学报,2011;30(9):1729—1737
12陈炳瑞,冯夏庭,曾雄辉,等.深埋隧洞TBM掘进微震实时监测与特征分析.岩石力学与工程学报,2011;30(2):275—283
13陈炳瑞,冯夏庭,肖亚勋,等.深埋隧洞TBM施工过程围岩损伤演化声发射试验.岩石力学与工程学报,2010;29(8):1562—1570
2 Hoek E,Brown E T.Underground excavations in rock.London:TheInstitution of Mining and Metallurgy,1980
3 Hoek,E,Kaiser P K,Bawden W F.Support of underground excava-tions in hard rock.Rotterdam:A.A.Balkema,1995
4刘立鹏,姚磊华,王成虎,等.地应力对脆性岩体洞群稳定性的影响.中南大学学报(自然科学版),2010;41(2):709—714
5 Eberhard T.Numerical modelling of three-dimension stress rotationahead of an advancing tunnel face.International Journal of Rock Me-chanics and Mining Sciences,2001;38(4):499—518
6 Moriyaa H,Fujita T,Niitsuma H,et al.Analysis of fracture propa-gation behavior using hydraulically induced acoustic emissions in theBernburg salt mine,Germany.International Journal of Rock Mechan-ics and Mining Sciences,2006;43(1):49—57
7 Brown E T,Hoek E.Technical note trends in relationships betweenmeasured in-situ stress and depth.International Journal of Rock Me-chanics and Mining Science&Geomechanics Abstracts,1978,15(4):211—215
8朱焕春,陶振宇.不同岩石中地应力分布.地震学报,1994,16(1):49—63
9赵德安,陈志敏,蔡小林,等.中国地应力场分布规律统计分析.岩石力学与工程学报,2007;26(6):1265—1271
10景锋,盛谦,张勇慧,等.中国大陆浅层地壳实测地应力分布规律研究.岩石力学与工程学报,2007;26(10):2056—2062
11刘宁,张春生,陈祥荣,等.深埋隧洞开挖围岩应力演化过程监测及特征研究.岩石力学与工程学报,2011;30(9):1729—1737
12陈炳瑞,冯夏庭,曾雄辉,等.深埋隧洞TBM掘进微震实时监测与特征分析.岩石力学与工程学报,2011;30(2):275—283
13陈炳瑞,冯夏庭,肖亚勋,等.深埋隧洞TBM施工过程围岩损伤演化声发射试验.岩石力学与工程学报,2010;29(8):1562—1570
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