地球科学进展 ›› 2008, Vol. 23 ›› Issue (5): 463 -468. doi: 10.11867/j.issn.1001-8166.2008.05.0463

地质工程 上一篇    下一篇

中国西部深切河谷谷底卸荷松弛带成因机理研究
王运生,罗永红,吴俊峰,孙耀明   
  1. 成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川 成都 610059
  • 收稿日期:2008-04-14 修回日期:2008-04-16 出版日期:2008-05-10
  • 通讯作者: 王运生 E-mail:wangys60@163.com
  • 基金资助:

    国家自然科学基金项目“中国西部深切河谷谷底卸荷松弛带形成机理及其工程效应研究”(编号:40472143/D0214)资助.

Study on the Genetic Mechanism of Unloaded and Relaxed Zone in the Deep River Valley Bottom, West of China 

Wang Yunsheng,Luo Yonghong,Wu Junfeng,Sun Yaoming   

  1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China
  • Received:2008-04-14 Revised:2008-04-16 Online:2008-05-10 Published:2008-05-10

中国西部深切河谷中大量钻孔等资料分析表明,西部深切河谷谷底浅表层普遍存在卸荷松弛现象。谷底卸荷松弛带一般厚10~20 m,具有弱风化、裂隙发育、岩体强度较低、完整性差、透水性较高等特征。研究结果揭示谷底形成后岩体经历了谷底应力集中→谷底岩体变形破坏→表层岩体卸荷松弛→次生裂隙发育→长期水岩相互作用→形成现今谷底弱风化、弱卸荷带。室内物理模拟研究直观地再现了谷底岩体应力集中、变形破坏,形成卸荷松弛现象。

According to the data of the hydroelectric boreholes in deep-cutting valleys in west of china, it can be concluded that the phenomena of unloading and relaxation in the deep-cutting river valley bottom are widely spread. The average thickness of the unloading and relaxation belts ranges from 10 m to 20 m, the characters of these zones are low-weathered, cracks developed, low rock strength, low completeness and high permeability, etc. The research found out the rocks in the valley bottom experienced a series of processes to turn into the loading release belts which are stress concentration in the valley bottom-deformation and broken of the rocks-rocks on the surface become loosened-secondary cracks developed-long-term inter-reacted between rocks and water-pressure release belts formed. By lab physical simulation of the processes which is described before, it can be seen directly the whole process of how pressure release belts are formed.

中图分类号: 

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