滇西北巨厚劈理化带特征及对滇藏铁路的影响研究
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摘要
通过滇藏铁路滇西北段活动断裂野外地质调查,发现并提出滇西北地区存在巨厚劈理化带,其空间分布和产状主要受区域活动断裂控制。从西藏盐井到云南丽江,按发育程度可划分为3个密集分布区,平面上呈右阶雁行排列。劈理化带的分布范围与正在规划中的滇藏铁路丽江—盐井段展布一致,其工程地质性质具有一定的特殊性和复杂性。野外调查和室内综合分析研究表明,滇西北地区劈理化带在沿线地质灾害、隧道涌突水、围岩变形和岩爆等方面对滇藏铁路工程具有重要影响。
From the field investigation,the authors discovered the massive rock mass with cleavages in northwestern Yunnan.The spatial distribution and occurrence of cleaved rock mass are controlled by the regional activity faults.From Yanjing in Tibet to Lijiang in Yunnan,there are three densely cleaved rock mass zones which are arrayed in right en-echelon formation and are consistent with the orientation of the Yunnan-Tibet railway in-northwestern Yunnan.In northwestern Yunana,the endogenetic force is closely coupled with the exogenetic force.The massive cleaved rock mass has special and complex property.Based on the fieldwork and analysis,this paper discusses the distribution and property of the massive cleaved rock mass in detail.The effect of the cleaved rock mass to the railway projects is analyzed to prevent geologic hazard,gushing water in tunnelling,distortion burst in the surrounding rocks.The discovery and analysis are useful to the railway projects in northwestern Yunnan.
From the field investigation,the authors discovered the massive rock mass with cleavages in northwestern Yunnan.The spatial distribution and occurrence of cleaved rock mass are controlled by the regional activity faults.From Yanjing in Tibet to Lijiang in Yunnan,there are three densely cleaved rock mass zones which are arrayed in right en-echelon formation and are consistent with the orientation of the Yunnan-Tibet railway in-northwestern Yunnan.In northwestern Yunana,the endogenetic force is closely coupled with the exogenetic force.The massive cleaved rock mass has special and complex property.Based on the fieldwork and analysis,this paper discusses the distribution and property of the massive cleaved rock mass in detail.The effect of the cleaved rock mass to the railway projects is analyzed to prevent geologic hazard,gushing water in tunnelling,distortion burst in the surrounding rocks.The discovery and analysis are useful to the railway projects in northwestern Yunnan.
引文
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[3]向宏发等.滇西北地区现代构造应力场[J].地震地质,1986,8(1):15~24.X iang Hongfa.The neotecton ic in NW-Yunnan region.Seismolo-gy and Geology,1986,8(1):15~24.
[4]刘光勋等.我国滇西北地震活动区的活动构造与应力状态[J].地震地质,1986,8(1):1~10.L iu Guangxun.The activity of neotecton ic and stress field in NW-Yunnan.Seismology and Geology,1986,8(1):1~10.
[5]谢富仁等.滇西北及邻区现代构造应力场[J].地震地质,1994,16(4):329~337.X ie Furen.Recent tecton ic stress field in northwest Yunnan prov-ince and its ad jacent areas.Seismology and Geology,1994,16(4):329~337.
[6]中国地震局地质研究所.云南澜沧江大华桥水电站工程场地地震安全性评价和水库诱发地震评价报告[R].1990.Institute of geology,State seismological bureau.The safety evalua-tion report of site and reservoir-induced earthquake to Dahuabridge hydroprojection on Lancangjiang river in Yunnan province.1990.
[7]何科昭,何浩生,蔡红飙.滇西造山带的形成与演化[J].地质论评,1996,42(2):97~106.He Kezhao,He Haosheng,Cai Hongsheng.Formation and evolu-tion of the western Yunan orogen ic belt.Geological Review,1996,42(2):97~106.
[8]云南省地质矿产局.云南省区域地质志[M].北京:地质出版社,1990.Yunnan bureau of geology and m ineral resources.The Yunnan re-gional geology annals.Beijing:The Geology Press,1990.
[9]唐川,朱静.云南滑坡泥石流研究[M].北京:商务印书馆,2003,1~60.Tang Chuan,Zhu Jing.The research of landslides and mudrockflow in Yunnan.BeiJing:The Comm erce Press,2003,1~60.
[10]唐川,黄楚兴,万晔.云南丽江大地震及其诱发的崩塌滑坡灾害特征[J].自然灾害学报,1997,6(3):76~84.Tang Chuan,Huang Chuxing,W an Ye.L ijiang earthquake andthe induced rockfalls and slumps in Yunnan.Journal of NaturalD isasters,1997,6(3):76~84.
[11]郭长宝,雷伟志,张永双等.滇藏铁路滇西北段主要地质灾害类型及发育规律探讨[J].地质力学学报,2006,12(2):228~235.Guo Changbao,Lei W eizh i,Zhang Yongshuang.The main typesof geohazard and d istribution law along the Yunnan-Tibet rail-way in NW Yunnan.Journal of Geom echan ics,2006,12(2):228~235.
[12]倪化勇,吕学军,杨德伟.川藏公路培龙沟路段堆积物的分形特征及其地质意义[J].工程地质学报,2005,13(4):451~454.N iHuayong,et al..Fractal feature and geological sign ificance ofaccumu lations at Peilong section along S ichuan-Tibet h ighway.Journal of Engineering Geology,2005,13(4):451~454.
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