CCS水电站输水隧洞工程地质条件分析与处理
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摘要
为保证CCS水电站输水隧洞双护盾TBM施工正常进行,开展了围岩分类与稳定性评价及隧洞超前地质预报,研究了施工方法,提出了施工技术建议。在双护盾TBM施工过程中,可见的围岩范围较小,无法进行地质素描,根据双护盾TBM施工的技术特点,选择了隧洞掌子面及洞壁小范围的围岩观察、TBM掘进参数分析、局部岩石回弹值测试、岩渣性状分析、地下水特征分析等多种方法获取围岩地质信息,从而对围岩进行分类和稳定性评价。选择了隧洞宏观地质条件分析、施工过程地质条件分析、以地震法和电法为主的物探方法、掌子面超前水平钻探等综合方法对掌子面前方围岩进行探测和预报,根据预报结果有针对性地采取处理措施。针对TBM施工过程中出现的涌水、砂岩砂化、断层破碎带等不良地质条件,建议施工单位采取了超前地质预报及调整掘进参数、堵水、超前灌浆加固围岩等施工方法和技术,TBM顺利通过了不良地质段。
In the TBM construction process of the headrace tunnel of CCS Hydropower Station, the main construction geology work is as follows, classification and stability evaluation of surrounding rock, advance geological prediction, construction method and construction technique suggestions. In the process of double-shield TBM construction, visible surrounding rock is too small to carry out geological sketch. According to the technical characteristics of double shield TBM construction, the surrounding rock observation, TBM tunneling parameter analysis, local rock rebound test, rock muck property analysis, groundwater characteristic analysis and other methods were selected to obtain the surrounding rock geological information, and then surrounding rock classification and stability evaluation were carried out. The comprehensive methods of tunnel macro-geological condition analysis, construction process geological condition analysis, geophysical prospecting method based on seismic method and electrical method, and horizontal drilling were selected to detect and forecast the surrounding rock in front of the tunnel face, and corresponding treatment measures were taken according to the prediction results. According to the water gushing, sandstone, fault zone and other adverse geological conditions, it suggested that the construction company to take the advanced geological forecast, adjust the tunneling parameters, water plugging and advanced grouting reinforcement technique, TBM passed the adverse geological section successfully.
In the TBM construction process of the headrace tunnel of CCS Hydropower Station, the main construction geology work is as follows, classification and stability evaluation of surrounding rock, advance geological prediction, construction method and construction technique suggestions. In the process of double-shield TBM construction, visible surrounding rock is too small to carry out geological sketch. According to the technical characteristics of double shield TBM construction, the surrounding rock observation, TBM tunneling parameter analysis, local rock rebound test, rock muck property analysis, groundwater characteristic analysis and other methods were selected to obtain the surrounding rock geological information, and then surrounding rock classification and stability evaluation were carried out. The comprehensive methods of tunnel macro-geological condition analysis, construction process geological condition analysis, geophysical prospecting method based on seismic method and electrical method, and horizontal drilling were selected to detect and forecast the surrounding rock in front of the tunnel face, and corresponding treatment measures were taken according to the prediction results. According to the water gushing, sandstone, fault zone and other adverse geological conditions, it suggested that the construction company to take the advanced geological forecast, adjust the tunneling parameters, water plugging and advanced grouting reinforcement technique, TBM passed the adverse geological section successfully.
引文
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[13] 孙金山,卢文波,苏利军,等.基于TBM掘进参数和渣料特征的岩体质量指标辨识[J].岩土工程学报,2008,30(12):1847-1854.
[14] 杨泽君.岩石强度回弹法测定的研究[D].长沙:湖南科技大学,2015:10-25.
[15] 袁秋霜,邓成进,胡晓阳.超声-回弹综合法在岩石无损检测及强度预测中的应用[J].水电能源科学,2013,31(9):92-95.
[16] 许建业,梁晋平,靳永久,等.隧洞TBM施工过程中的地质编录[J].水文地质工程地质,2000(6):35-39.
[17] 吕二超.ISP地质预报系统在引汉济渭工程岭北TBM施工中的应用[J].铁道建筑技术,2016(6):52-55.
[18] 高振宅.Beam地质超前预报系统在锦屏引水隧洞TBM施工中的应用[J].铁道建筑技术,2009(11):65-67.
[19] 朱劲,李天斌,李永林,等.Beam超前地质预报技术在铜锣山隧道中的应用[J].工程地质学报,2007,15(2):258-262.
[20] 程怀舟.基于钻机的TBM隧洞施工超前地质预报系统开发研究[D].武汉:武汉大学,2005:25-35.
[21] 陈东,吴庆鸣,程怀舟,等.基于多源数据融合的钻机超前地质探测系统[J].金属矿山,2007(4):49-52.
[22] 张红耀.超前钻机在TBM施工中的应用[J].建筑机械,2002(6):45-46.
[2] 惠世前,金长文.CCS水电站大断面长隧洞双护盾TBM掘进技术[J].云南水力发电,2014,30(5):78-81.
[3] 杨大勇,袁登波,闫新博.TBM在CCS水电站输水隧洞施工中的应用[J].云南水力发电,2015,31(6):75-78.
[4] 张国.厄瓜多尔CCS项目双护盾TBM通过断层破碎带施工技术研究与实施[J].水利建设与管理,2018(6):1-6.
[5] BIENIAWSKI Z T.Determining Rock Mass Determability:Experience from Case Histories[J].International Journal of Rock Mechanics and Mining Science & Geomechanics Abstract,1978(15):237-247.
[6] BIENIAWSKI Z T.Classification of Rock Masses for Engineering [M].New York:Wiley,1993:112-130.
[7] 杨继华,齐三红,郭卫新,等.CCS水电站引水隧洞双护盾TBM施工围岩分类研究[J].隧道建设,2017,37(7):788-793.
[8] 刘跃丽,郭峰,田满义.双护盾TBM开挖隧道围岩类型判别[J].同煤科技,2003(1):27-28.
[9] 李苍松,谷婷,丁建芳,等.TBM施工隧洞围岩级别划分探讨[J].工程地质学报,2010,18(5):730-736.
[10] 赵文华.TB880E掘进机在各类围岩中掘进参数选择[J].铁道建筑技术,2003(5):16-18.
[11] 刘瑞庆.不同地质情况下掘进参数的选择标准及经验[J].建筑机械,2000(7):40-42.
[12] 黄祥志.基于渣料和TBM掘进参数的围岩稳定分类方法的研究[D].武汉:武汉大学,2005:42-60.
[13] 孙金山,卢文波,苏利军,等.基于TBM掘进参数和渣料特征的岩体质量指标辨识[J].岩土工程学报,2008,30(12):1847-1854.
[14] 杨泽君.岩石强度回弹法测定的研究[D].长沙:湖南科技大学,2015:10-25.
[15] 袁秋霜,邓成进,胡晓阳.超声-回弹综合法在岩石无损检测及强度预测中的应用[J].水电能源科学,2013,31(9):92-95.
[16] 许建业,梁晋平,靳永久,等.隧洞TBM施工过程中的地质编录[J].水文地质工程地质,2000(6):35-39.
[17] 吕二超.ISP地质预报系统在引汉济渭工程岭北TBM施工中的应用[J].铁道建筑技术,2016(6):52-55.
[18] 高振宅.Beam地质超前预报系统在锦屏引水隧洞TBM施工中的应用[J].铁道建筑技术,2009(11):65-67.
[19] 朱劲,李天斌,李永林,等.Beam超前地质预报技术在铜锣山隧道中的应用[J].工程地质学报,2007,15(2):258-262.
[20] 程怀舟.基于钻机的TBM隧洞施工超前地质预报系统开发研究[D].武汉:武汉大学,2005:25-35.
[21] 陈东,吴庆鸣,程怀舟,等.基于多源数据融合的钻机超前地质探测系统[J].金属矿山,2007(4):49-52.
[22] 张红耀.超前钻机在TBM施工中的应用[J].建筑机械,2002(6):45-46.