Application of seepage analyses based on Fredlund & Xing model in red beds terrace landslides in eastern Sichuan
-
摘要:
四川省巴中市通江县新场镇七家沟村二社水头上滑坡为川东典型红层梯田滑坡，区内类似斜坡覆盖范围广泛，但针对该地区此类滑坡的渗流分析研究较少。在对滑坡区进行大量野外调查、勘查、资料收集的基础上，综合运用卫星遥感、无人机航拍、机载LiDAR、室内试验等技术手段，基于Fredlund & Xing土水特征曲线数学模型，采用Geo-Studio中SEEP/W模块进行渗流分析，将不同时间阶段分析结果与SLOPE/W模块耦合，继而得到稳定系数与降雨、时间之间的动态变化关系，揭示了滑坡的变形过程和形成机理。研究显示：（1）连续降雨促使坡体地下水位升高，稳定性降低，最终导致水头上滑坡整体失稳破坏；（2）滑坡变形过程、地下水出露特征与Geo-Studio计算结果基本吻合，说明基于Fredlund & Xing数值模拟在类似地区能提供较为准确的模拟结果；（3）开垦梯田（水田）会降低坡体稳定性。研究结果可为四川山区类似滑坡灾害进行隐患排查和主动防范提供理论支撑，为防灾减灾提供参考依据。
Abstract:The Shuitoushang landslide in Ershe in Qijiagou Village of Xinchang Town in Tongjiang County is a typical red-bed terrace landslide in eastern Sichuan. There are few studies on the seepage analyses of such landslides in this area, but similar slopes are widely distributed in the area. In this paper, on the basis of a large number of field investigations, surveys and data collection of disaster sites, the satellite remote sensing, UAV aerial photography, airborne LiDAR, indoor tests and other technical means are comprehensively used to analysis the landslide. Based on the mathematical model of Fredlund & Xing soil-water characteristic curve, the SEEP/W module in Geo-Studio is used to conduct the seepage analysis, and the analysis results at different time stages are coupled with the SLOPE/W module. Then the dynamic relationship between the stability coefficient, rainfall and time is obtained, revealing the deformation process and formation mechanism of the landslide. The results show that: (1) the continuous rainfall causes the groundwater level to rise and the slope stability to decrease, eventually leading to the overall instability and failure of the Shuitoushang landslide. (2) The deformation process of the landslide and the characteristics of groundwater exposure are basically consistent with the results calculated by Geo-Studio, indicating that the results based on Fredlund & Xing model can provide more accurate simulation results in similar areas. (3) Reclamation of terraced fields (paddy fields) will reduce slope stability. The results can provide theoretical support for hidden danger investigation and active prevention of similar landslide disasters in mountainous areas of Sichuan, and provide a reference for disaster prevention and mitigation.
-
Key words:
- Fredlund & Xing /
- seepage /
- numerical simulation /
- coupling /
- eastern Sichuan red beds /
- terrace /
- landslides
-
-
表 1 计算模型中岩土材料物理力学参数取值
Table 1. Values of physical and mechanical parameters of geotechnical materials in the calculation model
岩土材料 重度
/（kN·m−3）黏聚力
/kPa内摩擦角
/（°）饱和体积
含水率/%饱和渗透系数
/（m·d−1）耕植土（粉质黏土） 20.5/20.5 8 10 60 0.05 含碎块石粉质黏土 20.7/22.0 25 21 45 1.52 滑带土① 20.3/21.8 11 15 45 0.05 滑带土② 20.3/21.8 20 16 45 0.05 强风化粉砂质泥岩 22.5/23.4 30 27 20 1.24 中风化粉砂质泥岩 23.7/24.6 125 30 20 0.001 注：“/”号前后分别为天然重度和饱和重度。 
下载: 导出CSV
-
[1] 张玉成,杨光华,张玉兴. 滑坡的发生与降雨关系的研究[J]. 灾害学,2007,22(1):82 − 85. [ZHANG Yucheng,YANG Guanghua,ZHANG Yuxing. Research on the relationship between landslide and rainfall[J]. Journal of Catastrophology,2007,22(1):82 − 85. (in Chinese with English abstract) doi: 10.3969/j.issn.1000-811X.2007.01.018
[2] 房玉洁,肖天贵,许强. 四川巴中地区引发滑坡地质灾害的强降水类型及典型案例分析[J]. 地球科学前沿,2015,5(1):171 − 185. [FANG Yujie,XIAO Tiangui,XU Qiang. Different types of heavy rainfall which triggered the landslide in Sichuan Bazhong area and typical case analysis[J]. Advances in Geosciences,2015,5(1):171 − 185. (in Chinese with English abstract)
[3] 张勇,温智,程英建. 四川巴中市滑坡灾害与降雨雨型关系探讨[J]. 水文地质工程地质,2020,47(2):178 − 182. [ZHANG Yong,WEN Zhi,CHENG Yingjian. A discussion of the relationship between landslide disaster and rainfall types in Bazhong of Sichuan[J]. Hydrogeology & Engineering Geology,2020,47(2):178 − 182. (in Chinese with English abstract) doi: 10.16030/j.cnki.issn.1000-3665.201906036
[4] 李绍红,朱建东,王少阳,等. 考虑降雨类型的基岩型浅层边坡稳定性分析方法[J]. 水文地质工程地质,2018,45(2):131 − 135. [LI Shaohong,ZHU Jiandong,WANG Shaoyang,et al. Stability analysis methods for the bedrock shallow slope considering rainfall types[J]. Hydrogeology & Engineering Geology,2018,45(2):131 − 135. (in Chinese with English abstract)
[5] 张桂荣, 程伟. 降雨及库水位联合作用下秭归八字门滑坡稳定性预测[J]. 岩土力学, 2011, 32（增刊1）: 476 − 482
ZHANG Guirong, CHENG Wei. Stability prediction for Bazimen landslide of Zigui County under the associative action of reservoir water lever fluctuations and rainfall infiltration[J]. Rock and Soil Mechanics, 2011, 32（Sup 1）: 476 − 482. （in Chinese with English abstract）
[6] 林锋,王茜,葛海龙,等. 贵州省岑巩县大榕滑坡特征及形成机制研究[J]. 工程地质学报,2014,22(3):396 − 404. [LIN Feng,WANG Qian,GE Hailong,et al. Characteristic and mechanism of Darong landslide in Cengong County,Guizhou Province[J]. Journal of Engineering Geology,2014,22(3):396 − 404. (in Chinese with English abstract)
[7] 郁舒阳,张继勋,王军磊,等. 基于Fredlund & Xing参数下不同雨型边坡渗透稳定性分析[J]. 三峡大学学报(自然科学版),2017,39(6):46 − 51. [YU Shuyang,ZHANG Jixun,WANG Junlei,et al. Seepage and slope stability analysis under different rainfall patterns based on Fredlund & Xing parameters[J]. Journal of China Three Gorges University (Natural Sciences),2017,39(6):46 − 51. (in Chinese with English abstract)
[8] 王雪冬,李世宇,孙延峰,等. 考虑非饱和浸润层厚度和累积入渗量的改进Green-Ampt模型[J]. 水文地质工程地质,2021,48(6):64 − 71. [WANG Xuedong,LI Shiyu,SUN Yanfeng,et al. An improved Green-Ampt model for rainfall infiltration in the inner dumping site of an open pit coal mine[J]. Hydrogeology & Engineering Geology,2021,48(6):64 − 71. (in Chinese with English abstract)
[9] HOU Runing,CHEN Ningsheng,HU Guisheng,et al. Characteristics,mechanisms,and post-disaster lessons of the delayed semi-diagenetic landslide in Hanyuan,Sichuan,China[J]. Landslides,2022,19(2):437 − 449. doi: 10.1007/s10346-021-01751-0
[10] 易武, 董志鸿, 黄海峰, 等. 三峡库区树坪滑坡地下水渗流场分析. 工程地质学报, 2014, 22（增刊1）: 70 − 76
YI Wu, DONG Zhihong, HUANG Haifeng, et al. The analysis of groundwater seepage field in Shuping landslide in The Three Gorges Reservoir[J]. Journal of Engineering Geology, 2014, 22（Sup1）: 70 − 76.（in Chinese with English abstract）
[11] 张杰, 韩同春, 豆红强, 等. 基于农作物灌溉入渗的梯田边坡稳定性探讨[J]. 四川大学学报（工程科学版）, 2014, 46（增刊1）: 79 − 85
ZHANG Jie, HAN Tongchun, DOU Hongqiang, et al. Research on slope stability of terrace based on crop irrigation infiltration[J]. Journal of Sichuan University （Engineering Science Edition）, 2014, 46（Sup 1）: 79 − 85. （in Chinese with English abstract）
[12] 张明, 胡瑞林, 殷跃平, 等. 川东缓倾红层中降雨诱发型滑坡机制研究[J]. 岩石力学与工程学报, 2014, 33（增刊2）: 3783 − 3790
ZHANG Ming, HU Ruilin, YIN Yueping, et al. Study of mechanism of landslide induced by rainfall in gently inclined red stratum in east Sichuan Basin[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33（Sup 2）: 3783 − 3790. （in Chinese with English abstract）
[13] 李蕊,于孝民,王振涛. 川东红层缓倾角地层中降雨引起滑带土饱和对滑坡的稳定性影响[J]. 土工基础,2012,26(4):94 − 97. [LI Rui,YU Xiaomin,WANG Zhentao. Influence of slipped soil on the stability of landslides in eastern Sichuan Province[J]. Soil Engineering and Foundation,2012,26(4):94 − 97. (in Chinese with English abstract) doi: 10.3969/j.issn.1004-3152.2012.04.028
[14] 杨戒,李绍红,吴礼舟. 降雨作用下川东红层地区浅层土质滑坡稳定性数值分析[J]. 水力发电,2017,43(5):37 − 42. [YANG Jie,LI Shaohong,WU Lizhou. Numerical analysis on the stability of rainfall-induced shallow landslide in red-bed area of east Sichuan[J]. Water Power,2017,43(5):37 − 42. (in Chinese with English abstract) doi: 10.3969/j.issn.0559-9342.2017.05.009
[15] FREDLUND D G,XING Anqing. Equations for the soil-water characteristic curve[J]. Canadian Geotechnical Journal,1994,31(4):521 − 532. doi: 10.1139/t94-061
[16] Geo-Slope International Ltd. Geo-Slope International Ltd（2007a）SEEP/W user’s guide for finite element seepage analysis[M]. Calgary, Alberta, Canada: Geo-Slope International Ltd., 2010.
[17] Geo-Slope International Ltd. Geo-Slope International Ltd（2007b）SLOPE/W user’s guide for slope stability analysis[M]. Calgary, Alberta, Canada: Geo-Slope International Ltd., 2010.
[18] 张欢,巨能攀,陆渊,等. 基于无人机的滑坡地形快速重建与稳定性分析[J]. 水文地质工程地质,2021,48(6):171 − 179. [ZHANG Huan,JU Nengpan,LU Yuan,et al. Rapid remodeling of three-dimensional terrain and stability analyses of landslide based on UAV[J]. Hydrogeology & Engineering Geology,2021,48(6):171 − 179. (in Chinese with English abstract)
[19] 四川兴蜀工程勘察设计集团有限公司. 通江县新场镇七家沟村二社水头上滑坡治理工程勘查报告[R]. 成都: 四川兴蜀工程勘察设计集团有限公司, 2021
Sichuan Xingshu Engineering Survey and Design Group Co. Ltd. Investigation report of the Shuitoushang landslide control project[R]. Chengdu: Sichuan Xingshu Engineering Survey and Design Group Co. Ltd. , 2021. （in Chinese）
[20] 林鸿州,于玉贞,李广信,等. 土水特征曲线在滑坡预测中的应用性探讨[J]. 岩石力学与工程学报,2009,28(12):2569 − 2576. [LIN Hungchou,YU Yuzhen,LI Guangxin,et al. On application of soil-water characteristic curves to landslide forecast[J]. Chinese Journal of Rock Mechanics and Engineering,2009,28(12):2569 − 2576. (in Chinese with English abstract) doi: 10.3321/j.issn:1000-6915.2009.12.025
[21] FREDLUND D G,XING Anqing,HUANG Shangyan. 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
[22] 许建聪,尚岳全. 降雨作用下浅层碎石土滑坡解体破坏机理研究[J]. 自然灾害学报,2008,17(3):117 − 124. [XU Jiancong,SHANG Yuequan. Study on mechanism of disintegration and failure of shallow debris landslide under rainfall action[J]. Journal of Natural Disasters,2008,17(3):117 − 124. (in Chinese with English abstract) doi: 10.3969/j.issn.1004-4574.2008.03.020
-
图(12)
表(1)
计量
- 文章访问数: 1099
- PDF下载数: 54
- 施引文献: 0