三峡库区秭归县千将坪滑坡软化模型实验研究
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摘要
三峡库区千将坪滑坡机理至今在学术和工程界存在较大争议.为了探索库水浸泡对千将坪滑坡的作用和影响,通过取滑带土样进行浸泡试验,将试样按浸泡天数0d、7d、15d、30d、45d、60d、90d及120d分为8组进行,测定不同浸泡天数下试样的抗剪强度,获得千将坪滑坡滑带的浸泡软化规律,建立滑带软化模型.研究成果表明,在浸泡的120d内,试样的粘聚力和内摩擦角的衰减总体上都是保持先快后慢最终趋于稳定的规律,前30d为快速衰减阶段,强度衰减占总衰减幅度的80%左右;基于滑带浸泡软化规律,认为:千将坪滑坡滑动时,滑带累计浸泡已达33d,处于软化模型的快速衰减阶段,滑带的浸泡软化是千将坪滑坡在水库蓄水1月后发生失稳滑动的重要原因之一.
Both the engineering and the academic societies had been arguing about the mechanism of Qiangjiangping Landslide in China Three Gorges Reservoir Area for many years.In this paper,the softening law of Qianjiangping landslide sliding zone is revealed by soaked test data of shear strength from 8 group test samples deferent in 0,7,15,30,45,60,90 and 120 days.It is concluded that within 120 days of immersion,the decay rate of cohesion and internal friction angle of the sample generally keeps fast first,then slowly and finally tends to be stable.The first 30 days are rapid attenuation stage,with its strength attenuation accounts for about 80% of the total attenuation amplitude.Based on the softening law of sliding zone,it is analyzed that the landslide sliding when the slip zone had been soaked for 33 days,which is the rapid attenuation stage of the sliding zone.The test results lead to the conclusion that the soaked-softening of the sliding zone by one month of the reservoir impoundment is one of the main landslide sliding triggers.
Both the engineering and the academic societies had been arguing about the mechanism of Qiangjiangping Landslide in China Three Gorges Reservoir Area for many years.In this paper,the softening law of Qianjiangping landslide sliding zone is revealed by soaked test data of shear strength from 8 group test samples deferent in 0,7,15,30,45,60,90 and 120 days.It is concluded that within 120 days of immersion,the decay rate of cohesion and internal friction angle of the sample generally keeps fast first,then slowly and finally tends to be stable.The first 30 days are rapid attenuation stage,with its strength attenuation accounts for about 80% of the total attenuation amplitude.Based on the softening law of sliding zone,it is analyzed that the landslide sliding when the slip zone had been soaked for 33 days,which is the rapid attenuation stage of the sliding zone.The test results lead to the conclusion that the soaked-softening of the sliding zone by one month of the reservoir impoundment is one of the main landslide sliding triggers.
引文
[1]肖诗荣,刘德富,胡志宇.世界三大典型水库型顺层岩质滑坡工程地质比较研究[J].工程地质学报,2010,18(1):52-59.
[2]Wang Fawu,Zhang Yeming,Huo Zhitao.Tatsunori Matsumoto,Huang BoLin.The July 14,2003Qianjiangping Landslide,Three Gorges Reservoir,China[J].Landslides,2003,1(2):157-162.
[3]杨日红,杨金中,王治华.千将坪滑坡特征信息遥感提取及滑坡成因机理分析[J].地球与环境,2007,267(1):85-90.
[4]文宝萍,申健,谭建民.水在千将坪滑坡中的作用机理[J].水文地质工程地质,2008,35(3):12-18.
[5]肖诗荣,刘德富,姜福兴,等.三峡库区千将坪滑坡地质力学模型试验研究[J].岩石力学与工程学报,2010,29(5):1023-1030.
[6]肖诗荣,刘德富,胡志宇.三峡库区千将坪滑坡地质力学模型研究[J].岩土力学,2007,28(7):1459-1464.
[7]肖诗荣,刘德富,胡志宇.三峡库区千将坪滑坡高速滑动机制研究[J].岩土力学,2010,31(11):3531-3536.
[8]何蕾.矿物成分与水化学成分对粘性土抗剪强度的控制规律及其应用[D].北京:中国地质大学,2014.
[9]唐良琴.软弱夹层强度参数的主要影响因素分析[J].工程地质学报,2012,20(2):189-195.
[2]Wang Fawu,Zhang Yeming,Huo Zhitao.Tatsunori Matsumoto,Huang BoLin.The July 14,2003Qianjiangping Landslide,Three Gorges Reservoir,China[J].Landslides,2003,1(2):157-162.
[3]杨日红,杨金中,王治华.千将坪滑坡特征信息遥感提取及滑坡成因机理分析[J].地球与环境,2007,267(1):85-90.
[4]文宝萍,申健,谭建民.水在千将坪滑坡中的作用机理[J].水文地质工程地质,2008,35(3):12-18.
[5]肖诗荣,刘德富,姜福兴,等.三峡库区千将坪滑坡地质力学模型试验研究[J].岩石力学与工程学报,2010,29(5):1023-1030.
[6]肖诗荣,刘德富,胡志宇.三峡库区千将坪滑坡地质力学模型研究[J].岩土力学,2007,28(7):1459-1464.
[7]肖诗荣,刘德富,胡志宇.三峡库区千将坪滑坡高速滑动机制研究[J].岩土力学,2010,31(11):3531-3536.
[8]何蕾.矿物成分与水化学成分对粘性土抗剪强度的控制规律及其应用[D].北京:中国地质大学,2014.
[9]唐良琴.软弱夹层强度参数的主要影响因素分析[J].工程地质学报,2012,20(2):189-195.