云南虎跳峡两家人松散堆积体的基本特征及成因探讨
|
摘要
两家人松散堆积体位于金沙江中虎跳峡左岸,为第四纪岩土体混杂堆积体,规模巨大,结构无序,透水性 强。文章通过野外调查和资料对比分析,揭示了该松散堆积体的发育特征和形成机制,认为两家人堆积体成因具 有复合性,是一种由滑坡、崩塌和崩坡积多期次形成的复合地质体,为典型的内外动力耦合作用的产物。最后对松 散堆积体的稳定性进行了初步评价,表明两家人堆积体整体式破坏可能性不大,局部性质脆弱,在地震、降雨和人 类工程活动作用下可能发生大面积的失稳破坏
Liangjiaren large-scale loose deposits are located on the left bank of the middle Tiger-Leaping-Gorge of the Jinsha River. The deposits consist of a heterogeneous and incoherent mixture of Quaternary soil and rock fragments ranging in size from clay particles to rocks several centimeters or more in diameter, and more than sixty percent of the deposits are rock fragments. The area of this deposits is about 1.5km 2 and the total volume is estimated to be more than 1.8×10 8 m 3. Based on the detail field investigation and available data contrast analysis of typical loose deposits, the basic features and origin types of Liangjiaren loose deposits were investigated. Owing to complex and special climatic conditions, geological tectonics and geomorphology, the deposits' origin types include landslide mass, collapse mass and colluvium deposits etc. Liangjiaren loose deposits resulted from long term slope evolvement, and the forming processes of the deposits are very complex, which reflected the evolvement process of endogenic geological process and the surface reconstruction action of exogenic geological process in the Tiger-Leaping-Gorge area. Hereby, this paper put forward a coupling model of the Earth's endogenic and exogenic geological processes of Liangjiaren loose deposits. The analysis showed that Liangjiaren large-scale loose deposits resulted from many landslides, collapses, and detritus flow under the coordinate processes of crust uplift and river incision. They belong to composite geological body of the coupling of Earth's endogenic and exogenic geological processes. This paper analyzed and evaluated the stability of Liangjiaren large-scale loose deposits. The study indicated that these loose deposits can not form a integer unit for their loose structure; they will not deform and failure in a whole, but the stability of local part of Liangjiaren loose deposits is relatively lower and large-scale loose deposits failure can likely occur under the influence of earthquake, rainfall and human activities such as road excavating, impounding, flood discharge and pulverization. Thus, further study should emphasize on the deformation monitor and the local stability of Liangjiaren loose deposits. The large-scale complex loose deposits prevail in the Three-Gorge and the Tiger-Leaping-Gorge; they are prone to deform and failure, so the study of basic features, formation mechanism and qualitative evaluation of stability on Liangjiaren loose deposits will provide with a practice example of prevention and remediation of geo-hazards in above-mentioned areas.
Liangjiaren large-scale loose deposits are located on the left bank of the middle Tiger-Leaping-Gorge of the Jinsha River. The deposits consist of a heterogeneous and incoherent mixture of Quaternary soil and rock fragments ranging in size from clay particles to rocks several centimeters or more in diameter, and more than sixty percent of the deposits are rock fragments. The area of this deposits is about 1.5km 2 and the total volume is estimated to be more than 1.8×10 8 m 3. Based on the detail field investigation and available data contrast analysis of typical loose deposits, the basic features and origin types of Liangjiaren loose deposits were investigated. Owing to complex and special climatic conditions, geological tectonics and geomorphology, the deposits' origin types include landslide mass, collapse mass and colluvium deposits etc. Liangjiaren loose deposits resulted from long term slope evolvement, and the forming processes of the deposits are very complex, which reflected the evolvement process of endogenic geological process and the surface reconstruction action of exogenic geological process in the Tiger-Leaping-Gorge area. Hereby, this paper put forward a coupling model of the Earth's endogenic and exogenic geological processes of Liangjiaren loose deposits. The analysis showed that Liangjiaren large-scale loose deposits resulted from many landslides, collapses, and detritus flow under the coordinate processes of crust uplift and river incision. They belong to composite geological body of the coupling of Earth's endogenic and exogenic geological processes. This paper analyzed and evaluated the stability of Liangjiaren large-scale loose deposits. The study indicated that these loose deposits can not form a integer unit for their loose structure; they will not deform and failure in a whole, but the stability of local part of Liangjiaren loose deposits is relatively lower and large-scale loose deposits failure can likely occur under the influence of earthquake, rainfall and human activities such as road excavating, impounding, flood discharge and pulverization. Thus, further study should emphasize on the deformation monitor and the local stability of Liangjiaren loose deposits. The large-scale complex loose deposits prevail in the Three-Gorge and the Tiger-Leaping-Gorge; they are prone to deform and failure, so the study of basic features, formation mechanism and qualitative evaluation of stability on Liangjiaren loose deposits will provide with a practice example of prevention and remediation of geo-hazards in above-mentioned areas.
引文
1)成都理工大学,国家电力公司中南勘测设计研究院.金沙江虎跳峡水电站比选坝址区地质构造特征及其对工程的影响研究报告.2002
1)国家电力公司昆明勘测设计研究院勘察大队钻探资料.2004
1)赫建明.三峡库区土石混合体的变形与破坏机理研究.中国矿业大学北京校区博士学位论文.2004
1)国家电力公司昆明勘测设计研究院勘察大队钻探资料.2004
1)李铁锋.长江三峡斜坡演变模式与水库蓄水效应研究.北京大学博士学位论文.2001
1 夏金梧,周乐群,胡宗云.金沙江虎跳峡河段水电开发中存在的主要地质问题.人民长江,1997,12(28):29～31XiaJinwu,ZhouLequn,HuZongyun.Maingeologicalproblemsin hydro powerdevelopmentofTigerLeapingGorgeoftheJinshaRiver.RenminChangjiang,1997,12(28):29～31
2 李玉生,钟阴乾.长江三峡工程区大型滑坡崩塌.广州:广东旅游出版社,1993.1～40LiYusheng,ZhongYinqian.Large scaleLandslidesandCollapsesin theThreeGorgeEngineeringArea.Guangzhou:GuangdongTravelPublishingHouse,1993.1～40
3 崔政权.三峡工程库区域、镇建设中的岩土工程实施要点.见:崔政权,邓清禄编.岩土工程论文集.武汉:中国地质大学出版社,1996.1～5CuiZhengquan.Geotechniqueproceduresoftownreconstructionat theThreeGorge.In:CuiZhengquan,DengQinglueds.Proceedings ofGeotechniques.Wuhan:ChineseUniversityofGeosciencesPress,1996.1～5
4 胡海涛.对三峡移民迁建的地质环境问题的新认识.岩土工程界,1998,2(6):43～45HuHaitao.Newconceptonthegeologicalenvironmentofthe relocationandreconstructionattheThreeGorge.GeotechnicalEngineeringWorld,1998,2(6):43～45
5 殷跃平,张加桂,陈宝荪等.三峡库区巫山移民新城址松散堆积体成因机制研究.工程地质学报,2000,8(3):265～271YinYueping,ZhangJiagui,ChenBaosunetal.Formation mechanismoflarge scaleloosesedimentattherelocationsitesofWushancountyontheThreeGorges.JournalofEngineeringandGeology,2000,8(3):265～271
6 王思敬.地球内外动力耦合作用与重大地质灾害的成因初探.工程地质学报,2002,10(2):115～117WangSijing.CouplingofEarth sendogenicandexogenicgeological processesandoriginsonseriousgeologicaldisasters.JournalofEngineeringandGeology,2002,10(2):115～117
7 唐 川,黄楚兴,万 晔.云南省丽江大地震及其诱发的崩塌滑坡灾害特征.自然灾害学报,1997,6(3):76～84TangChuan,HuangChuxing,WanYe.Lijiangearthquakeandthe inducedrockfallsandslumpsinYunan.JournalofNaturalDisasters,1997,6(3):76～84
1)国家电力公司昆明勘测设计研究院勘察大队钻探资料.2004
1)赫建明.三峡库区土石混合体的变形与破坏机理研究.中国矿业大学北京校区博士学位论文.2004
1)国家电力公司昆明勘测设计研究院勘察大队钻探资料.2004
1)李铁锋.长江三峡斜坡演变模式与水库蓄水效应研究.北京大学博士学位论文.2001
1 夏金梧,周乐群,胡宗云.金沙江虎跳峡河段水电开发中存在的主要地质问题.人民长江,1997,12(28):29～31XiaJinwu,ZhouLequn,HuZongyun.Maingeologicalproblemsin hydro powerdevelopmentofTigerLeapingGorgeoftheJinshaRiver.RenminChangjiang,1997,12(28):29～31
2 李玉生,钟阴乾.长江三峡工程区大型滑坡崩塌.广州:广东旅游出版社,1993.1～40LiYusheng,ZhongYinqian.Large scaleLandslidesandCollapsesin theThreeGorgeEngineeringArea.Guangzhou:GuangdongTravelPublishingHouse,1993.1～40
3 崔政权.三峡工程库区域、镇建设中的岩土工程实施要点.见:崔政权,邓清禄编.岩土工程论文集.武汉:中国地质大学出版社,1996.1～5CuiZhengquan.Geotechniqueproceduresoftownreconstructionat theThreeGorge.In:CuiZhengquan,DengQinglueds.Proceedings ofGeotechniques.Wuhan:ChineseUniversityofGeosciencesPress,1996.1～5
4 胡海涛.对三峡移民迁建的地质环境问题的新认识.岩土工程界,1998,2(6):43～45HuHaitao.Newconceptonthegeologicalenvironmentofthe relocationandreconstructionattheThreeGorge.GeotechnicalEngineeringWorld,1998,2(6):43～45
5 殷跃平,张加桂,陈宝荪等.三峡库区巫山移民新城址松散堆积体成因机制研究.工程地质学报,2000,8(3):265～271YinYueping,ZhangJiagui,ChenBaosunetal.Formation mechanismoflarge scaleloosesedimentattherelocationsitesofWushancountyontheThreeGorges.JournalofEngineeringandGeology,2000,8(3):265～271
6 王思敬.地球内外动力耦合作用与重大地质灾害的成因初探.工程地质学报,2002,10(2):115～117WangSijing.CouplingofEarth sendogenicandexogenicgeological processesandoriginsonseriousgeologicaldisasters.JournalofEngineeringandGeology,2002,10(2):115～117
7 唐 川,黄楚兴,万 晔.云南省丽江大地震及其诱发的崩塌滑坡灾害特征.自然灾害学报,1997,6(3):76～84TangChuan,HuangChuxing,WanYe.Lijiangearthquakeandthe inducedrockfallsandslumpsinYunan.JournalofNaturalDisasters,1997,6(3):76～84
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心