| 中国西部深切河谷谷底卸荷松弛带成因机理研究 |
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| 引用本文： | 王运生,罗永红,吴俊峰,孙耀明.中国西部深切河谷谷底卸荷松弛带成因机理研究[J].地球科学进展,2008,23(5):463-468. |
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| 作者姓名： | 王运生 罗永红 吴俊峰 孙耀明 |
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| 作者单位： | 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 |
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| 摘 要： | 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10~20m，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。
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| 关 键 词： | 西部河谷 卸荷松弛 形成机理 物理模拟 |
| 文章编号： | 1001-8166(2008)05-0463-06 |
| 收稿时间： | 2008-04-14 |
| 修稿时间： | 2008年4月14日 |
Study on the Genetic Mechanism of Unloaded and Relaxed Zone in the Deep River Valley Bottom, West of China |
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| 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].Advance in Earth Sciences,2008,23(5):463-468. |
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| Authors: | WANG Yunsheng LUO Yonghong WU Junfeng SUN Yaoming |
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| Institution: | State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu 610059，China |
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| Abstract: | 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. |
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| Keywords: | Valley of western china Unloading and relaxation Genetic mechanism Physical Simulation |
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