库岸边坡倾角及水位变化对红土型库岸稳定性影响研究
|
摘要
水库库岸失稳对水库安全运行有重大影响。采用土工试验和干湿循环试验,结合数值计算及理论分析,研究红土型库岸边坡倾角和库水位升降与库岸稳定性的关系。结果表明:(1)在一定初始干密度条件下,红土抗剪强度随水位升降循环次数增加而非线性减小,且在水位升降循环约10次时趋于稳定。(2)在一定水位升降速率、升降幅度和升降循环次数条件下,红土型库岸稳定安全系数随库岸边坡倾角的增加总体上呈减小的趋势,且在边坡倾角为50°左右存在稳定安全系数极小值。(3)在一定水位升降循环次数条件下,水位上升到坡高的60%左右为上升阶段的相对危险区域,且水位上升速率对库岸稳定安全系数影响很小;水位下降至坡高的70%左右为库水位下降阶段的相对危险区域,且水位下降速率越大,库岸稳定安全系数越小。(4)针对一定初始干密度,库岸稳定安全系数先随水位升降循环次数的增加而减小,但在水位升降循环次数约10次后逐渐趋于稳定。库岸岩土体性质及库岸边坡倾角、水位变化都会对库岸稳定产生影响。
Reservoir bank instability poses great threat to the operation of reservoir. It is recognized that reservoir bank stability would be influenced by rock and soil properties, the inclination of bank slope and water level fluctuations. In this research, it investigated the relationships between slope angles, fluctuation of water level and the stability of a reservoir bank by joint works, including soil property tests, geotechnical experiments of dry and wet cycle for bank stability, numerical modelling and theoretical analysis. Results concluded:(1) under a certain initial dry density condition, the shear strength of laterite decreased nonlinearly with the increase of the number of water level fluctuation, and it tended to be stable when the number of fluctuation was about 10.(2) With a certain water level lifting rate, a certain lifting amplitude and a certain number of fluctuation times, the reservoir bank safety coefficient tended to decrease when the bank slope angle increased and the minimum of the bank safety coefficient existed when the slope angle was about 50°.(3) under a condition of a certain number of fluctuation times, the water level lifting rate did not affect the safety coefficient much, but the reservoir bank would be in risk when the water level raised up to about 60% of the bank slope height; however, during the water level drop, the bank safety coefficient decreased when the water level falling rate increased and the reservoir bank would be in risk when the water level reached about 70% of the bank slope height.(4) For a certain initial dry density, the safety coefficient of the reservoir bank firstly decreased with the increase of the number of water level fluctuation times, and gradually became stable after water level fluctuates 10 times.
Reservoir bank instability poses great threat to the operation of reservoir. It is recognized that reservoir bank stability would be influenced by rock and soil properties, the inclination of bank slope and water level fluctuations. In this research, it investigated the relationships between slope angles, fluctuation of water level and the stability of a reservoir bank by joint works, including soil property tests, geotechnical experiments of dry and wet cycle for bank stability, numerical modelling and theoretical analysis. Results concluded:(1) under a certain initial dry density condition, the shear strength of laterite decreased nonlinearly with the increase of the number of water level fluctuation, and it tended to be stable when the number of fluctuation was about 10.(2) With a certain water level lifting rate, a certain lifting amplitude and a certain number of fluctuation times, the reservoir bank safety coefficient tended to decrease when the bank slope angle increased and the minimum of the bank safety coefficient existed when the slope angle was about 50°.(3) under a condition of a certain number of fluctuation times, the water level lifting rate did not affect the safety coefficient much, but the reservoir bank would be in risk when the water level raised up to about 60% of the bank slope height; however, during the water level drop, the bank safety coefficient decreased when the water level falling rate increased and the reservoir bank would be in risk when the water level reached about 70% of the bank slope height.(4) For a certain initial dry density, the safety coefficient of the reservoir bank firstly decreased with the increase of the number of water level fluctuation times, and gradually became stable after water level fluctuates 10 times.
引文
[1]王浩,夏立权.涉水库岸稳定性影响因素及敏感性分析[J].岩土工程技术,2009,23(6):296-300.[WANG Hao,XIA Liquan.Influence factors and sensitivity analysis of stability for bank involved in water[J].Geotechnical Engineering Technique,2009,23(6):296-300]
[2]冉冉,刘艳锋.利用BSTEM模型分析库岸边坡形态对其稳定性的影响[J].地下水,2011,33(2):162-165.[RAN Ran,LIUYanfeng.Analysis of the impact of reservoir bank geometry on the stability via BSTEM model[J].Ground Water,2011,33(2):162-165]
[3]莫伟伟,徐平,丁秀丽.库水位涨落对滑坡稳定性影响研究进展[J].地下空间与工程学报,2006,2(6):997-1002.[MOWeiwei,XU Ping,DING Xiuli.Research advances on the influences of reservoir water level fluctuation on slope stability[J].Chinese Journal of Underground Space and Engineering,2006,2(6):997-1002]
[4]宋丹青,王丰,梅明星,等.水库蓄水对库岸边坡稳定性的影响[J].郑州大学学报(工学版),20l6,37(1):60-64.[SONGDanqing,WANG Feng,MEI Mingxing,et al.Study on influence of water impounding on reservoir landslide[J].Journal of Zhengzhou University(Engineering Science),2016,37(1):60-64]
[5]陈晓平.基于滑带土强度特性的水库蓄水诱发滑坡研究综述[J].水利水电科技进展,2010,30(3):77-83.[CHENXiaoping.Overview of landslides due to reservoir impoundment based on shear strength properties of sliding zone soil[J].Advances in Science and Technology of water Resources,2010,30(3):77-83]
[6]王小敏.库水位骤降情况下均质库岸边坡稳定性分析[J].贵州大学学报(自然科学版),2012,29(1):110-113.[WANGXiaomin.Stability analysis of homogeneous reservoir bank under drawdown condition[J].Journal of Guizhou University(Natural Sciences),2012,29(1):110-113]
[7]贾逸,任光明.某库岸滑坡在水库运行条件下稳定性的动态变化[J].水利与建筑工程学报,2011,9(5):24-30.[JIA Yi,RENGuangming.Dynamic changes of stability of a certain reservoir land slide under conditions of reservoir water level fluctuation[J].Journal of Water Resources and Architectural,2011,9(5):24-30]
[8]时卫民,郑颖人.库水位下降情况下滑坡的稳定性分析[J].水利学报,2004,(3):76-80.[SHI Weiming,ZHENG Yingren.Analysis on stability of landslide during reservoir drawdown[J].Journal of Hydraulic Engineering,2004,(3):76-80]
[9]曾刚.库水升降作用下水库库岸滑坡稳定性分析[J].三峡大学学报(自然科学版),2011,33(4):15-18.[ZENG Gang.Stability analysis of landslide under reservoir water level fluctuation[J].Journal of China Three Gorges University(Natural Sciences),2011,33(4):15-18]
[10]罗轶,任光明,王志红,等.某水库库岸稳定性的模糊综合评判[J].长江科学院院报,2011,28(6):67-70.[LUO Yi,RENGuangming,WANG Zhihong,et al.Fuzzy Comprehensive evaluation on the stability of reservoir bank[J].Journal of Yangtze River Scientific Research Institute,2011,28(6):67-70]
[11]徐佩华,陈剑平,阙金声,等.基于人工神经网络的三峡水库库岸稳定性分级[J].吉林大学学报(地球科学版),2007,37(3):564-569.[XUE Peihua,CHEN Jianping,QUE Jinsheng,et al.The grading model of reservoir bank stability of Three Gorges based on artificial neural network method[J].Journal of Jilin University(Earth Science Edition),2007,37(3):564-569]
[12]毕仁能,项伟,郭义,等.库岸滑坡黏性土与河水物理化学作用试验研究[J].长江科学院院报,2011,28(7):28-31.[BIRenneng,XIANG Wei,GUO Yi,et al.Physical and chemical reaction between river water and clayey soil from reservoir landslide[J].Journal of Yangtze River Scientific Research Institute,2011,28(7):28-31]
[13]王中文,洪宝宁,刘鑫,等.红粘土抗剪强度的水敏性研究[J].四川大学学报(工程科学版),2011,43(1):17-22.[WANGZhongwen,HONG Baoning,LIU Xin,et al.Ater-sensitive properties of shear strength of red clay[J].Journalof Sichuan University(Engineering Science Edition),2011,43(1):17-22]
[14]刘新荣,傅晏,王永新,等.(库)水-岩作用下砂岩抗剪强度劣化规律的试验研究[J].岩土工程学报,2008,30(9):1298-1302.[LIU Xinrong,FU Yan,WANG Yongxin,et al.Deterioration rulers of shear strength of sand rock under water-rock interaction of reservoir[J].Chinese Journal of Geotechnical Engineering,2008,30(9):1298-1302]
[15]周世良,刘小强,尚明芳,等.基于水-岩相互作用的泥岩库岸时变稳定性分析[J].岩土力学,2012,33(7):1933-1939.[ZHOU Shiliang,LIU Xiaoqiang,SHANG Mingfang,et al.Timevarying stability analysis of mudstone reservoir bank based on water-rock interaction[J].Rock and Soi1 Mechanics,2012,33(7):1933-1939]
[16]南京水利科学研究院.土工试验规程:SL237-1999[S].沈阳:辽宁民族出版社,1999:19-49.[Nanjing Academy of Water Conservancy.Specification of soil test:SL237-1999[S].Shenyang:Liaoning rationalities press,1999:19-49]
[17]张祖莲,梁谏杰,黄英,等.干湿循环作用下云南红土特性与库岸边坡稳定性关系研究[J].山地学报,2018,36(2):280-288.[ZHANG Zulian,LIANG Jianjie,HUANG Ying,et al.On the relationship between characteristics of Yunnan laterite and stability of the bank slope under wetting-drying cycles[J].Mountain Research,2018,36(2):280-288]
[2]冉冉,刘艳锋.利用BSTEM模型分析库岸边坡形态对其稳定性的影响[J].地下水,2011,33(2):162-165.[RAN Ran,LIUYanfeng.Analysis of the impact of reservoir bank geometry on the stability via BSTEM model[J].Ground Water,2011,33(2):162-165]
[3]莫伟伟,徐平,丁秀丽.库水位涨落对滑坡稳定性影响研究进展[J].地下空间与工程学报,2006,2(6):997-1002.[MOWeiwei,XU Ping,DING Xiuli.Research advances on the influences of reservoir water level fluctuation on slope stability[J].Chinese Journal of Underground Space and Engineering,2006,2(6):997-1002]
[4]宋丹青,王丰,梅明星,等.水库蓄水对库岸边坡稳定性的影响[J].郑州大学学报(工学版),20l6,37(1):60-64.[SONGDanqing,WANG Feng,MEI Mingxing,et al.Study on influence of water impounding on reservoir landslide[J].Journal of Zhengzhou University(Engineering Science),2016,37(1):60-64]
[5]陈晓平.基于滑带土强度特性的水库蓄水诱发滑坡研究综述[J].水利水电科技进展,2010,30(3):77-83.[CHENXiaoping.Overview of landslides due to reservoir impoundment based on shear strength properties of sliding zone soil[J].Advances in Science and Technology of water Resources,2010,30(3):77-83]
[6]王小敏.库水位骤降情况下均质库岸边坡稳定性分析[J].贵州大学学报(自然科学版),2012,29(1):110-113.[WANGXiaomin.Stability analysis of homogeneous reservoir bank under drawdown condition[J].Journal of Guizhou University(Natural Sciences),2012,29(1):110-113]
[7]贾逸,任光明.某库岸滑坡在水库运行条件下稳定性的动态变化[J].水利与建筑工程学报,2011,9(5):24-30.[JIA Yi,RENGuangming.Dynamic changes of stability of a certain reservoir land slide under conditions of reservoir water level fluctuation[J].Journal of Water Resources and Architectural,2011,9(5):24-30]
[8]时卫民,郑颖人.库水位下降情况下滑坡的稳定性分析[J].水利学报,2004,(3):76-80.[SHI Weiming,ZHENG Yingren.Analysis on stability of landslide during reservoir drawdown[J].Journal of Hydraulic Engineering,2004,(3):76-80]
[9]曾刚.库水升降作用下水库库岸滑坡稳定性分析[J].三峡大学学报(自然科学版),2011,33(4):15-18.[ZENG Gang.Stability analysis of landslide under reservoir water level fluctuation[J].Journal of China Three Gorges University(Natural Sciences),2011,33(4):15-18]
[10]罗轶,任光明,王志红,等.某水库库岸稳定性的模糊综合评判[J].长江科学院院报,2011,28(6):67-70.[LUO Yi,RENGuangming,WANG Zhihong,et al.Fuzzy Comprehensive evaluation on the stability of reservoir bank[J].Journal of Yangtze River Scientific Research Institute,2011,28(6):67-70]
[11]徐佩华,陈剑平,阙金声,等.基于人工神经网络的三峡水库库岸稳定性分级[J].吉林大学学报(地球科学版),2007,37(3):564-569.[XUE Peihua,CHEN Jianping,QUE Jinsheng,et al.The grading model of reservoir bank stability of Three Gorges based on artificial neural network method[J].Journal of Jilin University(Earth Science Edition),2007,37(3):564-569]
[12]毕仁能,项伟,郭义,等.库岸滑坡黏性土与河水物理化学作用试验研究[J].长江科学院院报,2011,28(7):28-31.[BIRenneng,XIANG Wei,GUO Yi,et al.Physical and chemical reaction between river water and clayey soil from reservoir landslide[J].Journal of Yangtze River Scientific Research Institute,2011,28(7):28-31]
[13]王中文,洪宝宁,刘鑫,等.红粘土抗剪强度的水敏性研究[J].四川大学学报(工程科学版),2011,43(1):17-22.[WANGZhongwen,HONG Baoning,LIU Xin,et al.Ater-sensitive properties of shear strength of red clay[J].Journalof Sichuan University(Engineering Science Edition),2011,43(1):17-22]
[14]刘新荣,傅晏,王永新,等.(库)水-岩作用下砂岩抗剪强度劣化规律的试验研究[J].岩土工程学报,2008,30(9):1298-1302.[LIU Xinrong,FU Yan,WANG Yongxin,et al.Deterioration rulers of shear strength of sand rock under water-rock interaction of reservoir[J].Chinese Journal of Geotechnical Engineering,2008,30(9):1298-1302]
[15]周世良,刘小强,尚明芳,等.基于水-岩相互作用的泥岩库岸时变稳定性分析[J].岩土力学,2012,33(7):1933-1939.[ZHOU Shiliang,LIU Xiaoqiang,SHANG Mingfang,et al.Timevarying stability analysis of mudstone reservoir bank based on water-rock interaction[J].Rock and Soi1 Mechanics,2012,33(7):1933-1939]
[16]南京水利科学研究院.土工试验规程:SL237-1999[S].沈阳:辽宁民族出版社,1999:19-49.[Nanjing Academy of Water Conservancy.Specification of soil test:SL237-1999[S].Shenyang:Liaoning rationalities press,1999:19-49]
[17]张祖莲,梁谏杰,黄英,等.干湿循环作用下云南红土特性与库岸边坡稳定性关系研究[J].山地学报,2018,36(2):280-288.[ZHANG Zulian,LIANG Jianjie,HUANG Ying,et al.On the relationship between characteristics of Yunnan laterite and stability of the bank slope under wetting-drying cycles[J].Mountain Research,2018,36(2):280-288]
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |