SIMULATION ANALYSIS OF THE INFLUENCE OF THE RESERVOIR WATER LEVEL FLUCTUATION RATE ON THE STABILITY OF SHUANGJIAPING ACCUMULATION LANDSLIDE IN YA'AN
-
摘要: 水库蓄水后库岸边坡的稳定性一直是研究的热点，库水位周期性涨落使得坡体内部渗流场发生变化进而影响其应力场，应力场作用于岩土体产生变形，其中水库水位升降速率对滑坡稳定性的影响尤为显著。本文以瀑布沟水电站库区双家坪滑坡为研究对象，在调查分析的基础上，基于非饱和土力学理论，考虑水—土特征曲线与渗透特性，对库水作用下的双家坪堆积体滑坡稳态—瞬态进行渗流场—稳定性数值计算。运用GeoStudio软件中的seep模块模拟库水作用下滑坡体地下水变化，计算出不同库水位升降速率条件下堆积体滑坡内部渗流场的变化并将结果耦合至slope模块中进行稳定性计算，研究结果表明：水位抬升阶段，滑坡的稳定性表现为先升高再降低，且水位抬升速率越大，滑坡稳定性升高后衰减的程度越大；水位下降阶段，滑坡的稳定性表现为先降低再逐渐回升的趋势，且水位下降速率越大，滑坡稳定性下降后再回升的程度越低。该研究结果对于库区地质灾害防灾减灾、监测预警以及水库合理调蓄具有重要的意义。Abstract: The stability of reservoir bank slope after impounding has been a hotspot for research, the periodic fluctuation of the reservoir water level can change the seepage field of the slope and then affect its stress field which can induces the deformation of the rock-soil mass. The effect of the reservoir water level fluctuation is especially significant for the stability of the landslide.In this paper, Shuangjiaping landslide at the Pubugou Hydropower Station Reservoir Area is chosen as the research object.On the basis of investigation and analysis, according to the theory of unsaturated soil mechanics, taking the soil-water characteristic curve and permeability into consideration, the stability and seepage value of Shuangjiapingaccumulation landslide under steady-transient conditions were calculated under the action of reservoir. Using the Seep module of GeoStudio software to simulate the landslide groundwater fluctuation under the action of reservoir, the changes of the internal seepage field in accumulation landslide under different reservoir fluctuation conditions were calculated and the results are coupled to the stability calculationin the slopemodule.The study results show that, as the water level rising, the landslide stability rise at first then get lower, and the higher the rate of elevation, the greater the extent of the decrease of the landslide stability. In water level decline phase, the stability of the landslide shows the trend first reduce gradually recover, and the higher the water level decline rate, the lower the extent of the decrease of the landslide stability.The study results have an important significance for the geological disaster monitoring and early warning, disaster prevention and mitigation, regulation of the storage capacity of reservoirs.
-
Key words:
- landslide /
- the rate of reservoir water level fluctuation /
- seepage /
- numerical analysis /
- stability
-
图 1 研究区构造纲要图
1-断层；2-河流；3-滑坡位置；4-县城驻地；5-乡镇驻地
Figure 1. The tectonic sketch in the research area
图 2 双家坪滑坡平面图
1-滑坡边界；2-产状；3-钻孔（钻孔编号及深度）；4-剖面线；5-河流；6-公路；7-等高线
Figure 2. The plan of Shuangjiaping landslide
图 3 双家坪滑坡工程地质剖面图
1-三叠系上统-侏罗系下统白果湾群砂岩、泥质粉砂岩；2-粉质黏土含碎石；3-碎块石土；4-滑带；5-钻孔编号及深度；6-裂缝
Figure 3. The engineering geological section of Shuangjiaping landslide
图 5 蓄水速度为0.5 m/天地下水瞬时浸润线
Figure 5. The transient phreatic lines under water level rise of 0.5 m per day
图 6 蓄水速度为1 m/天地下水瞬时浸润线
Figure 6. The transient phreatic lines under water level rise of 1 m per day
图 7 蓄水速度为2 m/天地下水瞬时浸润线
Figure 7. The transient phreatic lines under water level rise of 2 m per day
图 8 蓄水速度为5 m/天地下水瞬时浸润线
Figure 8. The transient phreatic lines under water level rise of 5 m per day
图 9 不同蓄水速度下时间与稳定性关系
Figure 9. The relationship between time and stability under different water level rising
图 10 水位下降速度为0.5 m/天地下水瞬时浸润线
Figure 10. The transient phreatic lines under water level fall of 0.5 m per day
图 11 水位下降速度为1 m/天地下水瞬时浸润线
Figure 11. The transient phreatic lines under water level fall of 1 m per day
图 12 水位下降速度为2 m/天地下水瞬时浸润线
Figure 12. The transient phreatic lines under water level fall of 2 m per day
图 13 水位下降速度为5 m/天地下水瞬时浸润线
Figure 13. The transient phreatic lines under water level fall of 5 m per day
-
[1] 郑万模, 巴仁基, 刘宇杰, 等. 大渡河流域地质灾害详细调查成果集成与综合研究报告[R]. 成都: 中国地质调查局成都地质调查中心, 2015.ZHENG Wan-mo, BA Ren-ji, LIU Yu-jie, et al.The Dadu River basin with geological disaster survey and integrated comprehensive research report[R]. Chengdu: Chengdu Center, China Geological Survey, 2015. [2] 张加桂.三峡库区巫山县新城址王家屋场滑坡研究[J].地质力学学报, 1999, 5(2): 21~28. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=19990219&journal_id=dzlxxbZHANG Jia-gui.Research on Wangjiawuchang landslide in the newly built Wushan County, the Three-Gorges Reservoir region[J]. Journal of Geomechanics, 1999, 5(2): 21~28. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=19990219&journal_id=dzlxxb [3] 杨达源, 李徐生, 冯立梅, 等.长江三峡库区崩塌滑坡的初步研究[J].地质力学学报, 2002, 8(2): 173~178. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20020218&journal_id=dzlxxbYANG Da-yuan, LI Xu-sheng, FENG Li-mei, et al. Pilot study on the collapses and landslidesof the Three Gorge Reservoir of the Changjiang River[J]. Journal of Geomechanics, 2002, 8(2): 173~178. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20020218&journal_id=dzlxxb [4] 廖红建, 盛谦, 高石夯, 等.库水位下降对滑坡体稳定性的影响[J].岩石力学与工程学报, 2005, 24(19): 3454~3458. doi: 10.3321/j.issn:1000-6915.2005.19.008LIAO Hong-jian, SHENG Qian, GAO Shi-hang, et al. Influence of drawdown of reservoir water level on landslide stability[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(19): 3454~3458. doi: 10.3321/j.issn:1000-6915.2005.19.008 [5] 黄栋, 乔建平, 张小刚.库水位变化对库岸滑坡稳定性影响的预测研究[J].长江科学院院报, 2012, 29(9): 103~106. http://www.cnki.com.cn/Article/CJFDTOTAL-CJKB201209028.htmHUANG Dong, QIAO Jian-ping, ZHANG Xiao-gang.Prediction of landslide stability of reservoir bank under the influence of water level fluctuation[J]. Journal of Yangtze River Scientific Research Institute, 2012, 29(9): 103~106. http://www.cnki.com.cn/Article/CJFDTOTAL-CJKB201209028.htm [6] 陶宏亮, 范士凯, 徐光黎, 等.库水位变化条件下堆积体滑坡变形特征及稳定性分析[J].水电能源科学, 2014, 32(5): 96~100. http://www.cnki.com.cn/Article/CJFDTOTAL-SDNY201405024.htmTAO Hong-liang, FAN Shi-kai, XU Guang-li, et al. Deformation and stability of collapse and gliding landslide with changes of water level[J]. Water Resources and Power, 2014, 32(5): 96~100. http://www.cnki.com.cn/Article/CJFDTOTAL-SDNY201405024.htm [7] 中村浩之.论水库滑坡[J].王恭先, 译.水土保持通报, 1990, 10(1): 53~64, 35. http://www.cnki.com.cn/Article/CJFDTOTAL-ZSUX201605046.htmZHONG Cun-hao-zhi.On reservoir landslide[J]. WANG Gong-xian, Trans. Bulletin of Soil and Water Conservation, 1990, 10(1): 53~64, 35. http://www.cnki.com.cn/Article/CJFDTOTAL-ZSUX201605046.htm [8] 胡畅, 牛瑞卿.三峡库区树坪滑坡变形特征及其诱发因素研究[J].安全与环境工程, 2013, 20(2): 41~45, 58. http://www.cnki.com.cn/Article/CJFDTOTAL-KTAQ201302010.htmHU Chang, NIU Rui-qing.Study on deformation characteristics and induction factors of Shupinglandslide in Three Gorges Reservoir area[J]. Safety and Environmental Engineering, 2013, 20(2): 41~45, 58. http://www.cnki.com.cn/Article/CJFDTOTAL-KTAQ201302010.htm [9] 刘才华, 陈从新, 冯夏庭, 等.地下水对库岸边坡稳定性的影响[J].岩土力学, 2005, 26(3): 419~422. http://www.cnki.com.cn/Article/CJFDTOTAL-YTLX20050300F.htmLIU Cai-hua, CHEN Cong-xin, FENG Xia-ting, et al. Effect of groundwater on stability of slopes at reservoir bank[J]. Rock and Soil Mechanics, 2005, 26(3): 419~422. http://www.cnki.com.cn/Article/CJFDTOTAL-YTLX20050300F.htm [10] 涂国祥, 邓辉, 黄润秋.水位变动速度对某库区岸坡堆积体稳定性的影响[J].四川大学学报(工程科学版), 2011, 43(4): 63~70. http://www.cnki.com.cn/Article/CJFDTOTAL-SCLH201104010.htmTU Guo-xiang, DENG Hui, HUANG Run-qiu.Influence on a bank slope accumulations' stability of the rising or falling speed of a reservoir water level[J]. Journal of Sichuan University (Engineering Science Edition), 2011, 43(4): 63~70. http://www.cnki.com.cn/Article/CJFDTOTAL-SCLH201104010.htm [11] 乐琪浪, 王洪德, 薛星桥, 等.三峡库区水位变化与花园养鸡厂滑坡变形特征关系[J].水文地质工程地质, 2011, 38(6): 68~73. http://www.cnki.com.cn/Article/CJFDTOTAL-SWDG201106013.htmLE Qi-lang, WANG Hong-de, XUE Xing-qiao, et al. Relationship between the deformation features of the Huayuanyangjichang landslide and water level changes in the Three Gorges Reservoir area[J]. Hydrogeology & Engineering Geology, 2011, 38(6): 68~73. http://www.cnki.com.cn/Article/CJFDTOTAL-SWDG201106013.htm [12] 杨金, 简文星, 杨虎锋, 等.三峡库区黄土坡滑坡浸润线动态变化规律研究[J].岩土力学, 2012, 33(3): 853~857. http://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201203033.htmYANG Jin, JIAN Wen-xing, YANG Hu-feng, et al. Dynamic variation rule of phreatic line in Huangtupo landslide in Three Gorges reservoir area[J]. Rock and Soil Mechanics, 2012, 33(3): 853~857. http://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201203033.htm [13] 原先凡, 邓华锋, 蔡健, 等.库水位升降条件下邻近坝址区堆积体边坡稳定性分析[J].水电能源科学, 2013, 31(9): 135~137. http://www.cnki.com.cn/Article/CJFDTOTAL-SDNY201309039.htmYUAN Xian-fan, DENG Hua-feng, CAI Jian, et al. Stability analysis of talus slope near dam site under reservoir water level rise and fall condition[J]. Water Resources and Power, 2013, 31(9): 135~137. http://www.cnki.com.cn/Article/CJFDTOTAL-SDNY201309039.htm [14] 杨强, 叶振南, 高幼龙.库水波动条件下滑坡体消落带响应关系研究[J].灾害学, 2014, 29(2): 29~32. http://www.cnki.com.cn/Article/CJFDTOTAL-ZHXU201402007.htmYANG Qiang, YE Zhen-nan, GAO You-long.Response relationship of riparian zone of the landslide mass with reservoir water fluctuation conditions[J]. Journal of Catastrophology, 2014, 29(2): 29~32. http://www.cnki.com.cn/Article/CJFDTOTAL-ZHXU201402007.htm [15] 肖志勇, 邓华锋, 李建林, 等.库水位间歇性下降对堆积体滑坡稳定性的影响[J].长江科学院院报, 2016, 33(8): 114~119. doi: 10.11988/ckyyb.20150486XIAO Zhi-yong, DENG Hua-feng, LI Jian-lin, et al. Influence of intermittent drawdown of reservoir water level on the stability of accumulation landslide[J]. Journal of Yangtze River Scientific Research Institute, 2016, 33(8): 114~119. doi: 10.11988/ckyyb.20150486 [16] Fredlund D G, Xing A Q, Huang S Y. Predicting the permeability function for unsaturated soils using the soil-water characteristic curve[J]. Canadian Geotechnical Journal, 1994, 31(4): 533~546. doi: 10.1139/t94-062 -
下载:
计量
- 文章访问数: 205
- HTML全文浏览量: 100
- PDF下载量: 11
- 被引次数: 0
