Determination of Penetration Parameters of a Bank or Dam Foundation with Sensitivity Analyzing Method
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摘要: 堤坝工程中地基渗透系数的选取具较大随机性, 为了解决这个问题, 采用敏感性分析理论建立了求解渗透系数敏感性因子的数学模型, 该模型在河南省燕山水库水利工程中的应用表明: 覆盖层渗透系数的敏感性最大(> 10-2), 设计应取试验值的大值; 其他部分渗透系数的敏感性相对较小(10-6~10-3), 设计中可取试验值的均值; 对于防渗设施, 只要达到一定密实度, 再降低其渗透系数, 防渗效果不会再有明显改善Abstract: There appears to be random to design the penetration parameters for a bank or dam foundation. To solve this problem, this paper introduces a sensitivity analyzing method to calculate the penetration parameter's sensitivity factor of each part in the calculation model. The application of the method in Yanshan reservoir indicates that the covering layer's penetration parameter's sensitivity factor (> 10-2) is the biggest, whose design parameter should then be the biggest of the testing values. The sensitivity factors (10-6-10-3) of other parts are relatively small, whose design parameters can then be the mean values. As for the anti-penetration objects, if dense enough, the decrease of the penetration parameters will be insignificant.
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图 2 粘土斜墙渗透系数敏感性分析结果(3组等值线基本重合)
Fig. 2. Sensitivity analyzing results of clay wall's penetration parameters (the three groups are almost overlapped)
图 3 排水体渗透系数敏感性分析结果
Fig. 3. Sensitivity analyzing results of the drainage part's penetration parameters
图 4 任意料区渗透系数敏感性分析结果
Fig. 4. Sensitivity analyzing results of the discretionarily filled part's penetration parameters
图 5 Q42卵石混合土渗透系数敏感性分析结果
Fig. 5. Sensitivity analyzing results of Q42's penetration parameters
图 6 Q3卵石混合土渗透系数敏感性分析结果
Fig. 6. Sensitivity analyzing results of Q3's penetration parameters
图 7 破碎带渗透系数敏感性分析结果(3组等值线基本重合)
Fig. 7. Sensitivity analyzing results of fault area's penetration parameters (the three groups are almost overlapped)
图 8 垂直防渗体渗透系数敏感性分析结果
Fig. 8. Sensitivity analyzing result of seepage-proof body's penetration parameters
表 1 计算模型各部分渗透系数试验值
Table 1. Calculation model's testing penetration parameters
表 2 计算模型各部分渗透系数敏感性分析结果
Table 2. Sensitivity analyzing results of penetration parameters
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[1] Chen, C.X., Tang, Z.H., 1993. Numerical analysis of underground water seepage. China University of Geosciences Press, Wuhan(in Chinese). [2] Mao, C.X., 1990. Seepage calculation analyzing and controlling. Water Conservancy and Hydroelectric Power Press, Beijing(in Chinese). [3] Tan, X.H., 2001. Reliability calculation and sensitivity analysis of a plane sliding slope. Geology of Anhui, 11(1): 49-54 (in Chinese with English abstract). [4] 陈崇希, 唐仲华, 1993. 地下水流动问题数值分析. 武汉: 中国地质大学出版社. [5] 毛昶熙, 1990. 渗流计算分析与控制. 北京: 水利水电出版社. [6] 谭晓慧, 2001. 平面滑动边坡的可靠度计算及敏感性分析. 安徽地质, 11(1): 49-54. https://www.cnki.com.cn/Article/CJFDTOTAL-AHDZ200101010.htm -
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