滇西北巨厚劈理化带特征及对滇藏铁路的影响研究

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。

DISCOVERY OF MASSIVE CLEAVED ROCK MASS ALONG RAILWAY BETWEEN YUNNAN AND TIBET AND ITS IMPLICATIONS

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.