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成都理工大学“地质灾害防治与地质环境保护实验室”获批准为国家重点实验室建设

2020-12-05 来源:好走旅游网
维普资讯 http://www.cqvip.com 第4期 王运生等:大渡河谷底卸荷松弛现象及其形成机制 ・383・ The unloaded and relaxed phenomena in the valley bottom of the Daduhe River and its genetic mechanism WANG Yun—sheng ,L1 Wen—gang。,HUANG Run~tai。。Luo Yong—hong 1.State Key Laboratory of Geological Hazards Prevention and Geological Environme t ProtPctio , Chengdu University of Technology,Chengdu 61 0059,China; 2.Chengdu Hydroelectric Investigation and Design Institute of SPC,Chengdu 610072,Chi n Abstract:More and more borehole data from Daduhe River in the recent years show that the rockmass on the valley bottom is fragmented,moderately weathered,low strength and high permeable to water,having an obvious phenomena of unloaded and relaxed.Based on the studv of the river bed overlay and borehole and the associated researched results,it is concluded that as soon as the bottom formed,the high stress concentration existed,the stress was big enough to form shear failures in the river bed rockmass and relaxed zones,then the stress Concentration zone moved toward the lower position.The dating of the overlay shows that the valley bottom of the Daduhe River formed 25 000 years ago,the unloaded and relaxed zone formed j ust during this long period,forming a continuous zone with the slope moderately unloaded. Key words:Daduhe River;unloaded and relaxed zone;valley bottom;moderate1y weathered zone: genetic mechanism 

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