凤亭河水库黏土心墙坝库水位变动渗流特性分析
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摘要
为研究库水位变动情况下凤亭河水库黏土心墙坝的渗透稳定性规律,根据非饱和渗流原理,利用Geostudio软件进行了数值模拟,得到了不同工况下坝体内部的浸润线变化情况、渗漏量以及上下游坝坡的稳定性规律,并对工程的防渗墙长度进行了优化。结果表明:库水位水平越低,浸润线也越低;库水位骤降时,心墙处的浸润线有一个"延缓下降"的效应;库水位水平越高,渗漏量越大,防渗墙深度越深,相同情况下的渗漏量越小;库水位水平越低,上游坝坡安全系数越低,而下游坝坡安全系数越高,防渗墙深度对下游坝坡安全系数大小的敏感性要大于上游坝坡;库水位骤降时,上游坝坡安全系数先减小、后增大,最后保持不变,而下游坝坡安全系数持续增大;根据凤亭河水库黏土心墙坝渗透稳定性计算结果,建议凤亭河水库黏土心墙坝防渗墙深度取为50 m。
In order to study the seepage stability law of the clay core wall dam of Fengting River reservoir under the condition of reservoir water level variation, according to the principle of unsaturated seepage, the numerical simulation was carried out by using Geostudio software, and the variation of the seepage line inside the dam body, the seepage amount and the stability of upstream and downstream dam slope under different working conditions were obtained, and the depth of the impervious wall was optimized. The results show that the lower the water level of the reservoir, the lower the infiltration line. When the reservoir water level drops suddenly, the infiltration line at the core wall has the effect of "delaying the decline". The higher the water level of the reservoir is, the greater the leakage is, the deeper the seepage wall depth is, the smaller the leakage is under the same conditions. The lower the reservoir water level is, the lower the safety factor of upstream dam slope is, yet the higher the safety factor of downstream dam slope is, and the sensitivity of the depth of impervious wall to the safety factor of downstream dam slope is greater than that of upstream dam slope. When the reservoir water level drops suddenly, the safety factor of the upstream dam slope decreases first, then increases, and finally remains unchanged, while the safety factor of the downstream dam slope continues to increase. According to the calculation results of the seepage stability of the clay core wall dam of Fengting Reservoir, it is suggested that the depth of the impervious wall of the Fengting River clay core wall dam should be 50 m.
In order to study the seepage stability law of the clay core wall dam of Fengting River reservoir under the condition of reservoir water level variation, according to the principle of unsaturated seepage, the numerical simulation was carried out by using Geostudio software, and the variation of the seepage line inside the dam body, the seepage amount and the stability of upstream and downstream dam slope under different working conditions were obtained, and the depth of the impervious wall was optimized. The results show that the lower the water level of the reservoir, the lower the infiltration line. When the reservoir water level drops suddenly, the infiltration line at the core wall has the effect of "delaying the decline". The higher the water level of the reservoir is, the greater the leakage is, the deeper the seepage wall depth is, the smaller the leakage is under the same conditions. The lower the reservoir water level is, the lower the safety factor of upstream dam slope is, yet the higher the safety factor of downstream dam slope is, and the sensitivity of the depth of impervious wall to the safety factor of downstream dam slope is greater than that of upstream dam slope. When the reservoir water level drops suddenly, the safety factor of the upstream dam slope decreases first, then increases, and finally remains unchanged, while the safety factor of the downstream dam slope continues to increase. According to the calculation results of the seepage stability of the clay core wall dam of Fengting Reservoir, it is suggested that the depth of the impervious wall of the Fengting River clay core wall dam should be 50 m.
引文
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[2] 刘杰.土坝与土石坝渗流控制技术发展的回顾与展望[J].人民黄河,1990,12(1):38-44.
[3] 徐清,何江达,谢红强,等.300 m级高土石坝地下厂区渗流场及渗控措施研究[J].水电能源科学,2014,32(7):78-82.
[4] 赵颖颖,刘亦锋,薛志良.运用有限单元法分析土石坝渗流控制[J].中国水运(下半月),2012,12(5):142-143.
[5] 陈守开,刘尚蔚,郭利霞,等.中、小型土石坝渗流场三维有限元分析方法及应用[J].应用基础与工程科学学报,2012,20(4):612-621.
[6] 方致远,何佳卓,张凯,等.水位骤降下面板堆石坝上游盖重区稳定性分析[J].人民黄河,2018,40(3):106-110.
[7] 李卓,何勇军,盛金保,等.降雨与库水位共同作用下近坝库岸边坡滑坡模型试验研究[J].岩土工程学报,2017,39(3):452-459.
[8] 韩东海.库水位波动对石佛寺水库滑波体稳定性的影响[J].水利规划与设计,2018(3):114-117.
[9] 张继勋,郁舒阳,胡南雄,等.考虑土工膜缺陷的面膜坝渗透稳定性分析[J].长江科学院院报,2018,35(11):96-100.
[10] 张珂峰.库水位骤降与降雨条件下深浅层边坡稳定性分析[J].水电能源科学,2018,36(11):139-143.
[11] 邓合玉,陈勇.库水升降条件下滑坡变形失稳机理研究[J].三峡大学学报(自然科学版),2018,40(6):30-34.
[12] 彭博.库水位骤降耦合不同类型降雨泥岩边坡渗透稳定性数值模拟研究[J].黄金科学技术,2018,26(5):647-655.
[13] 刘仕勇,李攀峰.溪洛渡库区典型滑坡堆积体变形与防灾探讨[J].地下空间与工程学报,2018,14(5):1393-1399.
[14] 唐超.路俄水库土石坝渗流与稳定分析[D].杨凌:西北农林科技大学,2017.
[15] 李建习,唐利苗,曹园园.水库水位非均匀下降情况下库岸浸润线求解[J].人民长江,2018,49(12):55-58,92.
[16] 张丙夺.小浪底水库2016年汛限水位动态试验实践与启示[J].中国防汛抗旱,2018,28(10):50-53.
[17] 杨东廷,伍岳,曾怀恩,等.八字门滑坡变形演化特征分析[J].三峡大学学报(自然科学版),2018,40(5):37-40.
[18] 丁树云,刘桂香,毕庆涛.某面板堆石坝应力及变形的有限元分析[J].华北水利水电学院学报,2013,34(5):17-22.