Advances in Earth Science
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Wang Yunsheng，Luo Yonghong，Wu Junfeng，Sun Yaoming
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.
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.