Study on the Genetic Mechanism of Unloaded and Relaxed Zone in the Deep River Valley Bottom, West of China
Received date: 2008-04-14
Revised date: 2008-04-16
Online published: 2008-05-10
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.
Wang Yunsheng，Luo Yonghong，Wu Junfeng，Sun Yaoming . Study on the Genetic Mechanism of Unloaded and Relaxed Zone in the Deep River Valley Bottom, West of China [J]. Advances in Earth Science, 2008 , 23(5) : 463 -468 . DOI: 10.11867/j.issn.1001-8166.2008.05.0463
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