贺兰口岩画附近典型危岩体稳定性分析
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摘要
通过前期现场调查,分析了贺兰口岩画的主要病害,提出岩画附近的危岩体是其中威胁较大的一类地质病害。根据现场勘察将贺兰口岩画附近不同状态的危岩体分为坠落式、滑塌式和倾倒式三类失稳模式。经过室内试验得到了岩石矿物组成、密度、气孔率、吸水率、单轴抗压强度等物理性质,并且利用Hoek-Brown准则、贯通率法以及岩石表面回弹值估算了危岩体与主控结构面的强度参数,例如单轴抗拉和抗压强度、变形模量、内摩擦角和黏聚力,然后利用不同失稳模式的计算方法进行稳定性分析。结果表明部分危岩体处于不稳定状态中,需要进行加固。
Geological investigation revealed that one of the most serious geological threats to rock art in Helan Valley was unstable rocks.The unstable rocks surrounding the rock art in Helan Valley are classified as three types: falling,sliding and toppling,depending on their potential modes of movement.The physical properties of the rocks,such as mineral composition,density,porosity,water absorption ability and uniaxial compressive strength were obtained through laboratory experiments.In addition,the parameters of the rock mass strength and the controlling stractural planes(e.g.,uniaxial tensile and compressive strength,deformation modulus,internal friction angle and cohesion) in the Helan Valley were estimated,respectively,by the Hoek-Brown criterion,the linking ratio method and the rock surface rebound values.The stability analysis was performed using different unstable models.The results indicated that some of the rocks are unstable and need to be reinforced.
Geological investigation revealed that one of the most serious geological threats to rock art in Helan Valley was unstable rocks.The unstable rocks surrounding the rock art in Helan Valley are classified as three types: falling,sliding and toppling,depending on their potential modes of movement.The physical properties of the rocks,such as mineral composition,density,porosity,water absorption ability and uniaxial compressive strength were obtained through laboratory experiments.In addition,the parameters of the rock mass strength and the controlling stractural planes(e.g.,uniaxial tensile and compressive strength,deformation modulus,internal friction angle and cohesion) in the Helan Valley were estimated,respectively,by the Hoek-Brown criterion,the linking ratio method and the rock surface rebound values.The stability analysis was performed using different unstable models.The results indicated that some of the rocks are unstable and need to be reinforced.
引文
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[3]陈洪凯,鲜学福,唐红梅,等.危岩稳定性分析方法[J].应用力学学报,2009,26(2):278-282.CHEN Hong-kai,XIAN Xue-fu,TANG Hong-mei,et al.Stabilityanalysis method for perilous rock[J].Chin J Appl Mech,2009,26(2):278-282.
[4]方云,刘建辉,王金华,等.宁明花山岩画区危岩体稳定研究[J].文物保护与考古科学,2007,19(4):37-40.FANG Yun,LIU Jian-hui WANG Jin-hua,et al.Stability studies ofdangerous-rock slumping of Huashan rock art in Ningming Country[J].Sci Conserv Archaeol,2007,19(4):37-40.
[5]苏永华,封立志,李志勇,等.Hoek-Brown准则中确定地质强度指标因素的量化[J].岩石力学与工程学报,2009,28(4):679-686.SU Yong-hua,FENG Li-zhi,LI Zhi-yong,et al.Quantification ofelements for geological strength index in Hoek-Brown criterion[J].Chin J Rock Mech Eng,2009,28(4):679-686.
[6]吴黎辉.岩体经验强度准则研究(硕士学位论文)[D].西安:长安大学,2004.WU Li-hui.The empirical rock strength criteria[D].Chang'an:Chang'an University,2004.
[7]卢书强,许模.基于GSI系统的岩体变形模量取值及应用[J].岩石力学与工程学报,2009,28(增1):2736-2742.LU Shu-qiang,XU Mo.Determination and application of modulusof deformation of rock masses based on GSI system[J].Chin JRock Mech Eng,2009,28(suppl1):1321-1325.
[8]韩凤山.大体积节理化岩体强度与力学参数[J].岩石力学与工程学报,2004,23(5):777-780.HAN Feng-shan.Strength and mechanical parameters of large-vol-ume jointed rockmass[J].Chin J Rock Mech Eng,2004,23(5):777-780.
[9]陈洪凯,唐红梅.危岩主控结构面强度参数计算方法[J].工程地质学报,2008,16(1):37-41.CHEN Hong-kai,TANG Hong-mei.Method for calculating strengthparameters of structural planes controlling the rock block stablity[J].J Eng Geo,2008,16(1):37-41.
[10]陈祖煜.岩质边坡稳定分析:原理,方法,程序[M].北京:中国水利水电出版社,2005.CHEN Zu-yu.Rock slope stability analysis[M].Beijing:ChinaWater Power Press,2005.
[11]Hoek E,Brown E T.Practical estimates of rock mass strength[J].Int J Rock Mech Min Sci,1997,34(8):1165-1186.
[12]CAI M,KAISER P K,UNO H,et al.Estimation of rock mass de-formation modulus and strength of jointed hard rock masses usingthe GSI system[J].Int J Rock Mech Min Sci,2004,41(1):3-19.
[13]陈洪凯,唐红梅,胡明,等.危岩锚固计算方法研究[J].岩石力学与工程学报,2005,24(8):1321-1327.CHEN Hong-kai,TANG Hong-mei,HU Ming,et al.Research onAnchorage Calculation Method for Unstable Rock[J].Chin J RockMech Eng,2005,24(8):1321-1327.
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