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冯文凯,顿佳伟,张国强,等. 库水作用下青杠坪滑坡堆积体变形演化趋势[J]. 科学技术与工程, 2020, 20(27): 11003-11011.
FENG Wenkai,ZHANG Guoqiang,et al.Study on Deformation Evolution Trend of Qinggangping Landslide Accumulation under the Action of Reservoir Water[J].Science Technology and Engineering,2020,20(27):11003-11011.
库水作用下青杠坪滑坡堆积体变形演化趋势
Study on Deformation Evolution Trend of Qinggangping Landslide Accumulation under the Action of Reservoir Water
投稿时间:2019-11-26  修订日期:2020-06-28
DOI:
中文关键词:  青杠坪滑坡堆积体  库水升降  抗剪强度  演化趋势
英文关键词:qinggangping landslide accumulation  reservoir water lift  shear strength  evolutionary trend
基金项目:国家自然科学基金(编号:41977252);四川省青年科技创新研究团队专项计划项目(编号:2017TD0018);地质灾害防治与地质环境保护国家重点实验室自主探索课题(编号:SKLGP2016Z001)
                 
作者单位
冯文凯 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
顿佳伟 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
张国强 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
易小宇 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
孟 睿 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
周 强 中国电力工程顾问集团西南电力设计院有限公司
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中文摘要:
      青杠坪滑坡为一巨型古滑坡,位于溪洛渡库区金沙江右岸,距坝址约15.5 km,受库水升降作用影响,滑坡局部于2014年4月24日复活,复活体方量约300万m3,灾害使137间房屋及0.6千米乡村公路等毁于一旦,造成约500万元的直接经济损失。鉴于青杠坪滑坡堆积体方量巨大,后期库水升降作用下堆积体可能进一步复活,将对当地居民的生命财产安全造成极大威胁,因此对该滑坡的变形演化趋势进行研究迫在眉睫,研究成果可为类似灾害的防治提供参考。为分析库水作用对滑坡堆积体的影响,本文以滑坡堆积体上角砾土的现场双环渗透试验和室内干湿循环试验为基础,运用FLAC3D(Fast Lagrangian Analysis of Continua)模拟库区水位升降作用下青杠坪滑坡堆积体变形演化趋势,研究结果显示:(1)青杠坪滑坡表层堆积体平均渗透系数为6.94×10-2cm/s,为中-强透水介质。(2)土体抗剪强度指标与干湿循环次数n存在一定关系:粘聚力 ,内摩擦角 。(3)库水位稳定于540 m与600 m高程条件下,坡体整体稳定,随着干湿循环次数的增加,坡体堆积体变形裂缝逐渐加大,稳定性系数不断降低,循环次数达35次时,滑坡体消落带以上780~930 m高程范围及巨型块石上部的堆积体将发生滑动,青杠坪滑坡将再次复活。
英文摘要:
      Qinggangping landslide is a giant ancient landslide. It is located on the right bank of Jinsha River in XiLuoDu Reservoir Area, about 15.5 km away from the dam site. It was affected by the lifting and lowering of reservoir water, and the landslide was partially revived on April 24, 2014. Due to the influence of the reservoir water, the landslide was partially resurrected on April 24, 2014, and the volume of the resurrected body was approximately 3 million m3, the disaster destroyed 137 houses and 0.6 kilometers of rural roads, causing direct economic losses of about 5 million yuan. In view of the huge volume of Qinggangping landslide deposits, the deposits may be revived under the effect of reservoir water lifting in the later period, which will pose a great threat to the lives and property of local residents. Therefore, It is urgent to study the deformation evolution of this landslide. It can provide reference for prevention and treatment of similar disasters. In order to analyze the influence of reservoir water on landslide deposits, this paper based on the on-site double-ring penetration test and dry-wet cycle test of broiled soil on landslide accumulation, using FLAC3D(Fast Lagrangian Analysis of Continua) to simulate the deformation of Qinggangping landslide deposit under the water level lifting and lowering of reservoir area. The evolutionary trend shows that: (1)The average permeability coefficient of the surface layer of the Qinggangping landslide is 6.94×10-2cm/s, which is a medium-strong permeable medium. (2)There is a certain relationship between the soil shear strength index and the number of dry and wet cycles n: cohesion , internal friction angle . (3)When the reservoir water level is stable at 540 m and 600 m elevation, the slope body is stable overall. With the increase of the number of dry and wet cycles, the deformation crack of the slope body gradually increases, and the stability coefficient decreases continuously. When the number of cycles reaches 35 times. The 780~930 m elevation range above the landslide body and the upper part of the giant block stone will slide, and the Qinggangping landslide will be revived again.
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