西气东输管道工程中卫黄河穿越隧道场地工程地质条件评价
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摘要
西气东输工程中卫黄河穿越隧道长1197.77m,高4.3m,宽5.6m。隧道入口高于黄河水位28m,出口高于黄河水位45m。隧道顶板高程为1130m。位于黄河水下100m。隧道场地围岩为寒武系磨盘井组灰绿色、银灰色浅变质中厚层细粒长石石英砂岩、千枚状板岩、绢云母化千枚岩。围岩为弱风化Ⅲ~Ⅳ类岩石。透水率为4~67Lu,纵波波速为500~3300m.s-1。BQ为300~400。变形模量为6.11~9.22GPa。泊松比(μ)0.14~0.24。内摩擦角(ψ)为42.1°~44.7°。地下水为基岩裂隙水。含水层为寒武系浅变质岩,受大气降水渗入补给,单井涌水量为1.0~50m3.d-1。隧道轴线穿越区岩体较完整—较破碎,未有全新活动断层。隧道位置选择和开挖深度设计是可行的。施工和长期运营是安全的。
This paper presents the evaluation of the engineering geological conditions for a large tunnel crossing Yellow River at Zhongwei.The tunnel is to transport gas from the western China to-the eastern China and is 1197.7 7m long and 4.3 m high and 5.6 m wide.The elevation of the tunnel ceiling is 1130 m above the sea level and 100 m below the Yellow River.The surrounding rocks are the Cambrian rocks,Mopanjing Formation and include celadon and silver-gray metamorphic medium heavy bedded fine-granular feldspar quartz sandstone and phyllitic slate and sericite phyllite.The class of the surrounding rock quality is III-IV.The permeable ratio is between 4 and 67 Lu,the P-wave velocity is from 500 to 3300 m·s-1.The BQ value is between 300 and 400.Modulus of deformation is between 6.11 and 9.22 GPa.Poisson's ratio is between 0.14 and 0.24.The internal friction angle(ψ) is between 42.1 ° and 44.7°.The groundwater is the water in fissures of the bedrock.The aquifer supplied by atmospheric precipitated water is the agnostogenic rocks of the Cambrian system.The seepage capacity of a signle well is 1.0 ~50 m3 per day.The traverse rock tunnel axis is from relative intact to relative broken rocks,and has no active faults.The alignment and depth of the tunnel design is adequate and feasible.The construction and long-term operation are safe.
This paper presents the evaluation of the engineering geological conditions for a large tunnel crossing Yellow River at Zhongwei.The tunnel is to transport gas from the western China to-the eastern China and is 1197.7 7m long and 4.3 m high and 5.6 m wide.The elevation of the tunnel ceiling is 1130 m above the sea level and 100 m below the Yellow River.The surrounding rocks are the Cambrian rocks,Mopanjing Formation and include celadon and silver-gray metamorphic medium heavy bedded fine-granular feldspar quartz sandstone and phyllitic slate and sericite phyllite.The class of the surrounding rock quality is III-IV.The permeable ratio is between 4 and 67 Lu,the P-wave velocity is from 500 to 3300 m·s-1.The BQ value is between 300 and 400.Modulus of deformation is between 6.11 and 9.22 GPa.Poisson's ratio is between 0.14 and 0.24.The internal friction angle(ψ) is between 42.1 ° and 44.7°.The groundwater is the water in fissures of the bedrock.The aquifer supplied by atmospheric precipitated water is the agnostogenic rocks of the Cambrian system.The seepage capacity of a signle well is 1.0 ~50 m3 per day.The traverse rock tunnel axis is from relative intact to relative broken rocks,and has no active faults.The alignment and depth of the tunnel design is adequate and feasible.The construction and long-term operation are safe.
引文
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[4]中华人民共和国水利水电工程局.水利水电工程地质勘察规范(GB50287—99)[S].北京:水利水电出版社,1999.People's Republic of China Water Conservancy and HydropowerEngineering Bureau.Geological prospecting for water conservancyand hydropower project.(GB50287-99).Beijing:HydropowerPress,1999.
[5]常士骠,张苏民,项勃,等.工程地质手册[M].北京:中国建筑工业出版社,1992,675~700.Chang Shibiao,Zhang Sumin,Xiang Bo.Geological engineeringmanual.Beijing:China's Construction Industry Press.1992,675~700.
[6]国家地震局.中国地震烈度区划图[S].北京:国家技术标准出版社,1990.State Seismological Bureau.The seismic zoning map of China.Bei-jing:National Technical Standards Press,1990.
[7]国家质量技术监督局.中国地震动参数区划图(GB18306—2001)[S].北京地震出版社,2001.State Bureau of Quality and Technical Supervision.China seismiczoning map(GB18306-2001).Beijing Seismological Press,2001.
[8]交通部第一公路勘察设计院.公路工程地质勘察规范(JTJ064—98)[S].北京:人民交通出版社出版,1999.First Traffic Highway Survey and Design Institute.Highway geo-logical prospecting(JTJ064-98).Beijing:People Traffic Pub-lisher,1999.
[9]河北省地质局水文地质四大队主编.水文地质手册[M].北京:地质出版社出版,1978,622~626.Geological bureau hydrogeological four teams editor in Hebei prov-ince.Hydrogeological manual[M].Beijing:Geological Publisher,1999.
[10]张永双,曲永新.陕北晋西砂黄土的胶结物与胶结作用研究[J].工程地质学报,2005,13(1):18~28.Zhang Yongshuang,et al..Cements of sand loess and their ce-mentation in north Shaanxi and west Shanxi.Journal of Engineer-ing Geology,2005,13(1):18~28.
[11]李晓,等.公伯峡电站开挖边坡古风化岩松弛与工程特性变化研究[J].工程地质学报,2005,13(1):155~159.Li Xiao,et al..Study on relaxation and change in engineeringcharacteristic of the rock paleo-weathered after slope excavated.Journal of Engineering Geology,2005,13(1):155~159.
[12]周洪福,聂德新,韦玉婷,等.黄河上游某电站上新统石膏夹层对坝基岩体稳定性影响评价[J].工程地质学报,2006,14(1):41~44.Zhou Hongfu,Nie Dexin,Wei Yuting,Wan Zongli,et al..Evalua-tion on influence of the pliocene gypsum layer on stability of dambase at a hydropower plant on the upstream of the Yellow River.Journal of Engineering Geology,2006,14(1):41~44.
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