| 雅砻江谷底卸荷松弛现象与深厚覆盖层特征 |
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| 引用本文： | 王运生,罗永红,唐兴君,孙耀明.雅砻江谷底卸荷松弛现象与深厚覆盖层特征[J].工程地质学报(英文版),2007,15(2):164-168. |
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| 作者姓名： | 王运生 罗永红 唐兴君 孙耀明 |
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| 作者单位： | 1.成都理工大学地质灾害防治与地质环境保护国家专业实验室,成都610059; |
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| 基金项目： | 中国西部深切河谷谷底松弛带形成机理及其工程效应研究（批准号：40472143/D0214）. 致谢 收集资料过程中得到中国水电顾问集团成都水电勘测设计院、华东水电勘测设计院等单位的大力协助,在此深表感谢. |
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| 摘 要： | 雅砻江河床覆盖层厚度多在30m以上,最厚可达51.6m。覆盖层横向上厚度变化较大,纵向上可明显分为3层,上、下部以正常河流相为主,厚度较薄;中部以洪积、崩积、坡积、湖泊沉积堆积与冲积混合堆积为主的加积序列,厚度相对较大。在谷底基岩面以下,岩体通常存在20m厚左右的卸荷松弛带,弱风化,具有透水性好,岩体完整性较差,工程力学性状差等特征,其潜在的工程效应是坝基渗漏。覆盖层深厚是第二层加积序列所致,谷底形成时间长,以致谷底有足够的时间卸荷松弛和风化。
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| 关 键 词： | 雅砻江 深厚覆盖层 谷底卸荷松驰现象 形成机制 |
| 文章编号： | 1004-9665/2007/15(02)-0164-05 |
| 收稿时间： | 2006-10-10 |
| 修稿时间： | 2006-11-23 |
CHARACTERISTICS OF THE THICK DEPOSIT LAYER UNDERLAIN WITH UNLOADED BEDROCK FORMING THE RIVER BED OF YALONG RIVER AND THEIR IMPLICATIONS IN DAM CONSTRUCTION |
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| WANG Yunsheng,LUO Yonghong,TANG Xingjun,SUN Yaoming.CHARACTERISTICS OF THE THICK DEPOSIT LAYER UNDERLAIN WITH UNLOADED BEDROCK FORMING THE RIVER BED OF YALONG RIVER AND THEIR IMPLICATIONS IN DAM CONSTRUCTION[J].Journal of Engineering Geology,2007,15(2):164-168. |
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| Authors: | WANG Yunsheng LUO Yonghong TANG Xingjun SUN Yaoming |
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| Institution: | 1.Chengdu University of Technology, Chengdu 610059;2.East China Investigation and Design Institute, Hangzhou 310030 |
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| Abstract: | The deposit layer in Yalong river bed is usually over 30 m thick and can be thick up to 51.6 m. The deposit thickness varies substantially horizontal direction. The deposit layer can be divided into three parts along the depth. The upper and lower parts are normal river faces, while the middle part is composed of alluvial, pluvial, barrier lacustrine, fluvial-glacial and comparatively thick. The underlain bedrock has a 20 m thick unloaded and relaxed zone. This zone has weak weathering, high permeability, poor integrality and poor engineering-mechanics features. It has an engineering implication in dam construction since it can be a leakage zone beneath dam base. The thick deposit layer was resulted from a second series of deposition. The unloaded and relaxed zone is due to the fact that the river bed was formed 25000 years ago, which had adequate time for the bedrock to unload, relax, and be weathered. |
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| Keywords: | Yalongjiang River Thick deposit River-bed Unloading Relaxing Bedrock Dam |
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