Seepage analysis of the fractured rock mass in the foundation of the main dam of the Xiaolangdi water control project
Seepage analysis of the fractured rock mass in the foundation of the main dam of the Xiaolangdi water control project
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小浪底水利枢纽主坝坝基裂隙岩体渗流分析
DOI：
10.1007/s12665-015-4445-0
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发表时间：
2015-05
期刊：
影响因子：
--
通讯作者：
Zhanjun Wang
中科院分区：
文献类型：
--
作者：
Lin Wang;Suhua Wu;Hui Yuan;Zhanjun Wang
小浪底水利枢纽主坝基础位于河床上，覆盖层深厚。基岩地质条件复杂，断层、裂隙发育。因此，坝基裂隙岩体的渗流对大坝的安全运行有着重要的影响。本文应用裂隙岩体渗流理论，建立了小浪底水利枢纽主坝坝基三维水文地质模型，考虑了坝基断层和裂隙的分布。通过对坝基渗透压计实测资料的反分析，得到了主要构造和断层的导水系数。通过实测水位和流量与计算结果的比较，验证了模型的有效性。在此基础上，对影响坝基渗流的不同因素进行了敏感性分析。得出以下结论：（1）渗流与库水位呈正相关，但存在滞后性;（2）坝基混凝土防渗墙有效地控制了渗流量。此外，增加两岸的帷幕深度可以减少一定量的渗漏。此外，右岸的防渗效果明显优于左岸。（3）深厚覆盖层对渗流的影响显著。大坝下游的排水帷幕有效地控制了坝基的渗流量，提高了坝基渗流的稳定性。（4）坝基断层对渗流有显著的影响。帷幕采用灌浆加固技术时，应特别重视帷幕与断层交汇处的防渗。（5）坝体上游的泥沙存款对坝基渗流量无影响，但会显著降低水头。
The foundation of the main dam in the Xiaolangdi water control project is located on the riverbed with a deep overburden layer. Here, the bed rocks have complex geological conditions and developed faults and fissures. Therefore, seepage within the fractured rock mass of the dam foundation has a significant impact on the safety operation of the dam. Using the fractured rock mass seepage theory, a three-dimensional hydrogeological model of the main dam foundation in the Xiaolangdi water control project is established in this paper which takes into account the distribution of faults and fissures in the foundation. The hydraulic conductivities of the major structures and faults are obtained by back-analyzing the data measured by osmometers embedded in the dam foundation. The model is validated by comparing measured water levels and flow rates with calculated results. On this basis, a sensitivity analysis was made of the different factors affecting seepage in the dam foundation. The following conclusions can be made: (1) Seepage is positively correlated with the reservoir’s water level, but there is hysteresis in the correlation, (2) the concrete cutoff wall in the dam’s foundation effectively controls the amount of seepage. Also, an increase in the curtain depth on both banks reduces seepage a certain amount. Furthermore, the right bank is clearly more impermeable than the left bank, (3) the deep-coverage layer of the foundation has a notable influence on seepage. The drainage curtain in the downstream of the dam effectively controls the amount of seepage in the dam foundation and improves the stability of the foundation seepage, (4) faults in the dam’s foundation have a significant influence on seepage. If grout-strengthening technology is applied to the curtain, seepage control at the intersection between the curtain and faults should be especially highlighted, (5) the sediment deposit upstream of the dam body has no impact on the quantity of seepage from the dam’s foundation, but it does significantly reduce the hydraulic head.
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DOI：
10.1109/icdma.2013.368
发表时间：
2013-06
期刊：
2013 Fourth International Conference on Digital Manufacturing & Automation
影响因子：
--
作者：
Ma Chengcheng;L. Shouyi;Wu Liya
通讯作者：
Ma Chengcheng;L. Shouyi;Wu Liya
DOI：
10.4028/www.scientific.net/amr.904.389
发表时间：
2014-03
期刊：
Advanced Materials Research
影响因子：
--
作者：
Xiandun Chai;Zhenzhong Shen;Baisong Nie
通讯作者：
Xiandun Chai;Zhenzhong Shen;Baisong Nie
DOI：
10.1061/9780784413128.038
发表时间：
2013-11
期刊：
--
影响因子：
--
作者：
Han Xu;Bin Huang;Xibao Rao;Jia-jun Pan;Yun Chen
通讯作者：
Han Xu;Bin Huang;Xibao Rao;Jia-jun Pan;Yun Chen
影响因子：
1.5
作者：
Zhang Li-jun
通讯作者：
Zhang Li-jun
DOI：
--
发表时间：
2009
期刊：
Chinese journal of rock mechanics and engineering
影响因子：
--
作者：
Chen Sheng-hong
通讯作者：
Chen Sheng-hong