Email Alerts
RSS
Analysis of seepage and dam slope stability for anti-seepage transformation of silt dam
-
摘要: 为提高小流域地表水的利用率，解决山区灌溉用水问题，结合山西省偏关县咀儿上淤地坝开展淤地坝防渗改造的技术研究。针对该淤地坝上游坝坡，提出原土培厚、黏土斜墙、复合土工膜共3种改造措施5种改造方案，并考虑渗流场和应力场的耦合影响，对原坝体和各种改造方案的渗流和坝坡稳定性进行数值模拟计算。结果表明：原坝体受渗透水的影响较大，无法安全蓄水；仅对上游坝坡进行原土培厚并不能使坝体满足防渗要求；在上游坝坡铺设黏土斜墙或土工膜可有效降低浸润线、减少渗流量、提高下游坝坡的稳定性；土工膜方案相对于其他方案具有更好的安全性和可行性，可以在条件允许的前提下优先考虑。研究结果对类似淤地坝防渗改造工程具有一定的指导意义。Abstract: In order to improve the utilization rate of surface water in small watersheds and solve the problem of irrigation water in mountainous areas, We have carried out the technical research of anti-seepage modification of Juershang silt dam in Pianguan County, Shanxi Province. Aiming at the upstream slope of the silt dam, five reconstruction schemes were put forward including original soil thickening, clay inclined wall and composite geomembrane. The seepage and slope stability of the original dam and various modification schemes were numerically simulated considering the coupling effects of seepage field and stress field. The results show that the original dam is greatly affected by the seepage water and cannot store water safely; only the original soil thickening of the upstream slope of the dam cannot make the dam meet the requirements for seepage prevention; laying a clay inclined wall or geomembrane anti-seepage body on the upstream slope can effectively reduce the infiltration line and the seepage flow, and improve the stability of the downstream slope of dam; the geomembrane scheme has better safety and feasibility than other schemes, and can be given priority if conditions permit. The research results have certain guiding significance for the anti-seepage transformation projects of similar silt dams.
-
Key words:
- silt dam /
- fluid-solid coupling theory /
- seepage /
- slope stability
-
图 2 原坝体等势线及流速矢量（单位：渗流流速，m·s−1；等势线，m）
Figure 2. Equipotential line and velocity vector of original dam （unit: seepage velocity in m·s−1; equipotential line in m）
图 5 方案A3等势线及流速（单位：流速，m·s−1；等势线，m）
Figure 5. Equipotential line and velocity vector of scheme A3 （unit: seepage velocity in m·s−1; equipotential line in m）
图 7 方案B等势线及流速（单位：流速，m·s−1；等势线，m）
Figure 7. Equipotential line and velocity vector of scheme B （unit: seepage velocity in m·s−1; equipotential line in m）
图 9 方案C等势线及流速矢量（单位：渗流流速，m·s−1；等势线，m）
Figure 9. Equipotential line and velocity vector of scheme C （unit: seepage velocity in m·s−1; equipotential line in m）
表 1 主要材料物理参数
Table 1. Physical parameters of main materials
材料 弹性模量/MPa 泊松比 黏聚力/kPa 摩擦角/˚ 渗透系数/(m·s−1） 坝体 7.53 0.30 23.00 25.00 1.00×10−7 坝基 15.00 0.29 50.00 21.00 2.19×10−9 黏土斜墙 10.00 0.35 12.30 23.60 1.00×10−9 土工膜 1.25×104 0.25 － 20.00 1.00×10−14 
下载: 导出CSV
表 2 验证结果对比
Table 2. Comparison of verification results
计算方法 出逸点高度/m 单宽渗流量/（m2·s−1） 安全系数 流固耦合 10.67 4.380×10−7 1.084 传统法 10.41 4.240×10−7 1.152
下载: 导出CSV
表 3 各改造方案详情
Table 3. Details of each transformation scheme
改造方案及编号 上游边坡系数 下游边坡系数 坝顶宽/m 坝底宽/m 原坝体（A0） 2.25/2.00 2.00/1.75 3.50 95.00 原土培厚（A1） 2.50 2.00/1.75 7.50 105.50 原土培厚（A2） 3.00 2.00/1.75 7.50 116.50 原土培厚（A3） 3.50 2.00/1.75 7.50 127.50 黏土斜墙（B） 3.00 2.00/1.75 7.50 116.50 复合土工膜（C） 2.25 2.00/1.75 7.50 100.00
下载: 导出CSV
表 4 各方案渗流稳定分析结果
Table 4. Seepage stability analysis results of each scheme
方案 渗流计算结果 稳定性计算结果 单宽渗流量/(m2·s−1) 出逸点高度/m 蓄水后最大水平位移/m 安全系数 原坝体（A0） 4.380×10−7 10.67 0.141 1.084 原土培厚（A1） 4.073×10−7 10.27 0.138 1.108 原土培厚（A2） 3.756×10−7 10.02 0.132 1.159 原土培厚（A3） 3.579×10−7 9.86 0.126 1.190 黏土斜墙（B） 1.175×10−7 3.00 0.094 1.598 复合土工膜（C） 8.414×10−9 0.86 0.093 1.851
下载: 导出CSV
-
[1] 谷黎明. 淤地坝蓄水运行黏土防渗改造与渗流分析[D]. 太原: 太原理工大学, 2019. GU Liming. Anti-seepage modification and seepage analysis of clay in water storage operation of silt dam[D]. Taiyuan: Taiyuan University of Technology, 2019. （in Chinese） [2] 高江林, 陈云翔. 基于渗流与应力耦合的防渗墙与坝体相互作用的数值模拟[J]. 水利水运工程学报,2013(2):58-63 doi: 10.3969/j.issn.1009-640X.2013.02.010 GAO Jianglin, CHEN Yunxiang. Numerical simulation of interaction between cut-off wall and earth-rock dam based on coupling of seepage and stress[J]. Hydro-Science and Engineering, 2013(2): 58-63. (in Chinese) doi: 10.3969/j.issn.1009-640X.2013.02.010 [3] 张欣. 基于ABAQUS流固耦合理论的库岸滑坡稳定性分析[D]. 济南: 山东大学, 2005. ZHANG Xin. Stability analysis of reservoir landslide based on the ABAQUS seepage-stress coupling theory[D]. Ji’nan: Shandong University, 2005. （in Chinese） [4] 李宗坤, 王鹏飞, 赵凤遥. 基于流固耦合理论的土石坝稳定性分析[J]. 郑州大学学报(工学版),2009,30(3):44-47 LI Zongkun, WANG Pengfei, ZHAO Fengyao. Stability analysis of earth-rockfill dam based on fluid-solid couping[J]. Journal of Zhengzhou University (Engineering Science), 2009, 30(3): 44-47. (in Chinese) [5] 王嘉贵, 严俊, 魏迎奇, 等. 深厚覆盖层上高土石坝蓄水后的流固耦合效应分析[J]. 水力发电,2014,40(4):38-41 doi: 10.3969/j.issn.0559-9342.2014.04.011 WANG Jiagui, YAN Jun, WEI Yingqi, et al. Analysis of fluid-solid coupling effect in high earth-rock dam on deep overburden after reservoir impounding[J]. Water Power, 2014, 40(4): 38-41. (in Chinese) doi: 10.3969/j.issn.0559-9342.2014.04.011 [6] 苗丽, 王复明, 郭雪莽. 考虑应力场作用的土坝渗透系数反演方法研究[J]. 中国农村水利水电,2009(1):59-61, 63 MIAO Li, WANG Fuming, GU Xuemang. Back analysis of seepage in earth dam considering the effection of strain fields[J]. China Rural Water and Hydropower, 2009(1): 59-61, 63. (in Chinese) [7] 李子阳, 马福恒, 张湛, 等. 水位骤变下土石坝非稳定渗流及稳定分析[J]. 人民黄河,2019,41(1):106-110 doi: 10.3969/j.issn.1000-1379.2019.01.024 LI Ziyang, MA Fuheng, ZHANG Zhan, et al. Unsteady seepage and stability analysis of earth-rock dam under the rapid changes of reservoir level[J]. Yellow River, 2019, 41(1): 106-110. (in Chinese) doi: 10.3969/j.issn.1000-1379.2019.01.024 [8] 陈晓平, 茜平一, 梁志松, 等. 非均质土坝稳定性的渗流场和应力场耦合分析[J]. 岩土力学,2004,25(6):860-864 doi: 10.3969/j.issn.1000-7598.2004.06.004 CHEN Xiaoping, QIAN Pingyi, LIANG Zhisong, et al. Coupling analysis of heterogeneous earth dam stability of seepage field and stress field[J]. Rock and Soil Mechanics, 2004, 25(6): 860-864. (in Chinese) doi: 10.3969/j.issn.1000-7598.2004.06.004 [9] 迟守旭. 基于ANSYS的土石坝三维非线性有限元计算方法研究及实现[D]. 天津: 天津大学, 2004. CHI Shouxu. The study and realization of three-dimension nonlinear FEA method of earth-rock dam due to ANSYS[D]. Tianjin: Tianjin University, 2004. （in Chinese） [10] 祁德庆, 刘印, 徐连民, 等. 考虑非饱和土基质吸力作用的土石坝渗流分析[J]. 力学季刊,2008,29(4):590-595 QI Deqing, LIU Yin, XU Lianmin, et al. Seepage analysis of earth rock dam considering matric suction of unsaturated soils[J]. Chinese Quarterly of Mechanics, 2008, 29(4): 590-595. (in Chinese) [11] 郑颖人, 唐晓松, 赵尚毅, 等. 有限元强度折减法在涉水岸坡工程中的应用[J]. 水利水运工程学报,2009(4):1-10 doi: 10.3969/j.issn.1009-640X.2009.04.001 ZHENG Yingren, TANG Xiaosong, ZHAO Shangyi, et al. Application of strength reduction FEM in fording slope[J]. Hydro-Science and Engineering, 2009(4): 1-10. (in Chinese) doi: 10.3969/j.issn.1009-640X.2009.04.001 [12] 毛昶熙. 渗流计算分析与控制[M]. 北京: 水利电力出版社, 1990. MAO Changxi. Seepage computation analysis and control[M]. Beijing: Water Resources and Electric Power Press, 1990. （in Chinese） [13] 尚层, 李玉建, 徐千军, 等. 复合土工膜不同锚固型式对膜应力变形的影响研究[J]. 中国农村水利水电,2012(10):72-75 SHANG Ceng, LI Yujian, XU Qianjun, et al. Different anchorage types of composite geomembrane effect on stress deformation of geomembrane[J]. China Rural Water and Hydropower, 2012(10): 72-75. (in Chinese) [14] 介玉新, 李广信. 有限元计算中土工合成材料渗流问题的处理[J]. 水利水电科技进展,2009,29(6):42-43, 62 doi: 10.3880/j.issn.1006-7647.2009.06.011 JIE Yuxin, LI Guangxin. FEM calculation of seepage through geosyntherics[J]. Advances in Science and Technology of Water Resources, 2009, 29(6): 42-43, 62. (in Chinese) doi: 10.3880/j.issn.1006-7647.2009.06.011 -
点击查看大图
计量
- 文章访问数: 156
- HTML全文浏览量: 120
- PDF下载量: 15
- 被引次数: 0
