北山预选区新场地段岩体节理几何特征及评价
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摘要
准确分析和评价BS17,BS18和BS19钻孔周边岩体节理几何特征,是我国高放废物处置北山预选区新场地段场址筛选及适宜性评价的重点内容和关键步骤之一。通过现场调查、数理统计和概率分析等方法,对该地区的岩体节理几何特性进行研究,结果表明:(1)各钻孔均发育4个节理优势组,尤以NE向和NW向最发育;(2)节理倾角以陡倾角的剪节理为主,节理产状服从正态分布函数,节理间距可用负指数函数进行有效拟合;(3)节理平均间距宽,迹长长,中点面密度小。基于岩体节理在高放废物处置库工程安全运行中的重要性。采用JSR法对岩体节理发育特征进行综合评价,发现新场地段3个钻孔周围岩体节理发育程度轻微、区域差异性小、岩体完整性好,断层对其两侧岩体的节理发育有促进作用,研究结果可为北山预选区处置库场址筛选和场址适宜性评价提供必要的数据支持。
Accurate analysis and evaluation of the geometric features of joints around BS17,BS18 and BS19 boreholes are the major task of site selection and site suitability evaluation of Xinchang section at Beishan,a candidate area in China. Site investigation,mathematical statistics and probability analysis were applied to study the geometric features of joints. 4 joint sets were observed in three boreholes,and the dominant orientations for joints are NE and NW. Joints are mainly shearing and steep dip and obey the normal distribution function. The spacing of joints is a negative exponential function. Wide spacing,long trace length and small trace midpoint density are the main characteristics of Xinchang section. Considering the importance of joints in high-level radioactive repository, JSR method was applied to evaluate the quality of rock mass. The results indicate that the joints of rock mass are little developed and that the differences between the regions are small. Hence,the integrity of rock mass is good. In addition,the existence of faults may promote the joints development along the two sides of the fault in rock mass. The research and evaluation of joints provided important data support for repository site selection and site suitability evaluation
Accurate analysis and evaluation of the geometric features of joints around BS17,BS18 and BS19 boreholes are the major task of site selection and site suitability evaluation of Xinchang section at Beishan,a candidate area in China. Site investigation,mathematical statistics and probability analysis were applied to study the geometric features of joints. 4 joint sets were observed in three boreholes,and the dominant orientations for joints are NE and NW. Joints are mainly shearing and steep dip and obey the normal distribution function. The spacing of joints is a negative exponential function. Wide spacing,long trace length and small trace midpoint density are the main characteristics of Xinchang section. Considering the importance of joints in high-level radioactive repository, JSR method was applied to evaluate the quality of rock mass. The results indicate that the joints of rock mass are little developed and that the differences between the regions are small. Hence,the integrity of rock mass is good. In addition,the existence of faults may promote the joints development along the two sides of the fault in rock mass. The research and evaluation of joints provided important data support for repository site selection and site suitability evaluation
引文
[1]王驹,陈伟明,苏锐,等.高放废物地质处置及其若干关键科学问题[J].岩石力学与工程学报,2006,25(4):801–812.(WANG Ju,CHEN Weiming,SU Rui,et al.Geological disposal of high-levelradioactive waste and its key scientific issues[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(4):801–812.(in Chinese))
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[14]王峰,王驹,范洪海,等.甘肃北山旧井地区晚第四纪活动断裂分布及其构造意义[J].地质论评,2005,51(3):252–256.(WANG Feng,WANG Ju,FAN Honghai,et al.Distribution of late quaternary active faults and its tectonic significance in the Beishan Region,Gansu Province,China[J].Geological Review,2005,51(3):252–256.(in Chinese))
[15]谢富仁,崔效锋,赵建涛,等.中国大陆及邻区现代构造应力场分区[J].地球物理学报,2004,47(4):654–662.(XIE Furen,CUI Xiaofeng,ZHAO Jiantao,et al.Regional division of the rechet tectonic stress field in China and adjacent areas[J].Chinese Journal of Geophysics,2006,47(4):654–662.(in Chinese))
[16]International Society for Rock Mechanics on Standardization of Laboratory and Field Tests.Suggested method for the quantitatived description of discontinutitie in rock masses[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abatracts,1978,15(6):319–368.
[17]王永江,耿树方,李长江.北山大地构造深部成因与浅部成矿特征遥感综合分析[J].中国地质,2009,36(3):714–727.(WANG Yongjiang,GENG Shufang,LI Changjiang.A remote sensing analysis of deep genesis of geotectonics and shallow oreforming characteristics in the Beishan Mountain[J].Geology in China,2009,36(3):714–727.(in Chinese))
[18]BARTON N.Some new Q-value correlations to assist in site characterization and tunnel design[J].International Journal of Rock Mechanics and Mining Sciences,2002,39(2):185–216.
[19]BIENIAWSKI Z T.Engineering classification of jointed rock masses[J].Civil Engineer in South Africa,1973,15:335–343.
[20]郑颖人,王永甫,王城,等.节理岩体隧道的稳定分析与破坏规律探讨——隧道稳定性分析讲座之一[J].地下空间与工程学报,2011,7(4):649–566.(ZHENG Yingren,WANG Yongfu,WANG Cheng,et al.Stability analysis and exploration of failure law of jointed rock tunnel—seminor on tunnel stability analysis[J].Chinese Journal of Underground Space and Engineering,2011,7(4):649–566.(in Chinese))
[21]王刚,赵坚,宋宏伟.节理岩体中巷道稳定性分析[J].中南大学学报:自然科学版,2013,44(7):2 910–2 918.(WANG Gang,ZHAO Jian,SONG Hongwei.Analysis on roadway stability in jointed rock mass[J].Journal of Central South University:Science and Technology,2013,44(7):2 910–2 918.(in Chinese))
[2]郭永海,王海龙,董建楠,等.高放废物处置库芨芨槽预选场址深部地下水同位素研究[J].地质学报,2013,87(87):1 477–1 485.(GUO Yonghai,WANG Hailong,DONG Jiannan,et al.Isotopic sady of deep groundwater in Jijicao preselected site for China?s high level radioactive waste disposal repository[J].Acta Geologica Sinica,2013,87(87):1 477–1 485.(in Chinese))
[3]BINGHAM C.Distributions on the sphere and on the projective plane[Ph.D.Thesis][D].Connecticut:New Haven Connecticut USA Yale University,1964.
[4]KULATILAKE P H S W.Fitting fisher distributions to discontinuity orientation data[J].Journal of Geological Education 1985,33(5):266–269.
[5]KULATILAKE P H S W.Bivariate normal distribution fitting on discontinuity orientation clusters[J].Mathematical Geology,1986,18(2):181–195.
[6]PRIEST S D,HUDSON J A.Estimation of discontinuity spacing and trace length using scanline surveys[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1981,18(3):183–197.
[7]PRIEST S D,HUDSON J A.Discontinuity spacing in rock[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1976,13(5):135–148.
[8]ZHANG L,EINSTEIN H H.Estimating the mean trace length of rock discontinuities[J].Rock Mechanics and Rock Engineering,1998,31(4):217–235.
[9]杨春和,包宏涛,王贵宾,等.岩体节理平均迹长和迹线中点面密度估计[J].岩石力学与工程学报,2006,25(12):2 475–2 480.(YANG Chunhe,BAO Hongtao,WANG Guibin,et al.Estimation of mean trace length and trace midpoint density of rock mass joints[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(12):2 475–2 480.(in Chinese))
[10]金远新,闵茂中,陈伟明,等.甘肃北山预选区新场地段花岗岩类岩石特征研究[J].岩石力学与工程学报,2007,26(增2):3 974–3 981.(JIN Yuanxin,MIN Maozhong,CHEN Weiming,et al.Study on granite characteristics of Xinchang section of candidate Beishan Area,Gansu Province[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(Supp.2):3 974–3 981.(in Chinese))
[11]陈伟明,王驹,赵宏刚,等.高放废物地质处置北山预选区新场地段地质特征[J].岩石力学与工程学报,2007,26(增2):4 000–4 006.(CHEN Weiming,WANG Ju,ZHAO Honggang,et al.Geological characters of Xinchang section in preselected Beishan Region for high-level radioactive waste disposal[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(Supp.2):4 000–4 006.(in Chinese))
[12]王峰,苏刚,晋佩东.甘肃北山地区晚第四纪构造变形特征及演化趋势[J].地震研究,2004,27(4):173–178.(WANG Feng,SU Gang,JIN Peidong.Tectonic deformation and evolution trend of Beishan Region,Gansu Province since late quaternar[J].Journal of Seismological Research,2004,27(4):173–178.(in Chinese))
[13]杨建国,谢春林,王小红,等.甘肃北山地区基本构造格局和成矿系列特征[J].地质通报,2012,32(2/3):422–438.(YANG Jianguo,XIE Chunlin,WANG Xiaohong,et al.Basic tectonic framework and features of metallogenic series in Beishan area,Gansu Province[J].Geological Bulletin of China,2006,32(2/3):422–438.(in Chinese))
[14]王峰,王驹,范洪海,等.甘肃北山旧井地区晚第四纪活动断裂分布及其构造意义[J].地质论评,2005,51(3):252–256.(WANG Feng,WANG Ju,FAN Honghai,et al.Distribution of late quaternary active faults and its tectonic significance in the Beishan Region,Gansu Province,China[J].Geological Review,2005,51(3):252–256.(in Chinese))
[15]谢富仁,崔效锋,赵建涛,等.中国大陆及邻区现代构造应力场分区[J].地球物理学报,2004,47(4):654–662.(XIE Furen,CUI Xiaofeng,ZHAO Jiantao,et al.Regional division of the rechet tectonic stress field in China and adjacent areas[J].Chinese Journal of Geophysics,2006,47(4):654–662.(in Chinese))
[16]International Society for Rock Mechanics on Standardization of Laboratory and Field Tests.Suggested method for the quantitatived description of discontinutitie in rock masses[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abatracts,1978,15(6):319–368.
[17]王永江,耿树方,李长江.北山大地构造深部成因与浅部成矿特征遥感综合分析[J].中国地质,2009,36(3):714–727.(WANG Yongjiang,GENG Shufang,LI Changjiang.A remote sensing analysis of deep genesis of geotectonics and shallow oreforming characteristics in the Beishan Mountain[J].Geology in China,2009,36(3):714–727.(in Chinese))
[18]BARTON N.Some new Q-value correlations to assist in site characterization and tunnel design[J].International Journal of Rock Mechanics and Mining Sciences,2002,39(2):185–216.
[19]BIENIAWSKI Z T.Engineering classification of jointed rock masses[J].Civil Engineer in South Africa,1973,15:335–343.
[20]郑颖人,王永甫,王城,等.节理岩体隧道的稳定分析与破坏规律探讨——隧道稳定性分析讲座之一[J].地下空间与工程学报,2011,7(4):649–566.(ZHENG Yingren,WANG Yongfu,WANG Cheng,et al.Stability analysis and exploration of failure law of jointed rock tunnel—seminor on tunnel stability analysis[J].Chinese Journal of Underground Space and Engineering,2011,7(4):649–566.(in Chinese))
[21]王刚,赵坚,宋宏伟.节理岩体中巷道稳定性分析[J].中南大学学报:自然科学版,2013,44(7):2 910–2 918.(WANG Gang,ZHAO Jian,SONG Hongwei.Analysis on roadway stability in jointed rock mass[J].Journal of Central South University:Science and Technology,2013,44(7):2 910–2 918.(in Chinese))