富水水库坝基渗压水头测值变化规律分析
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摘要
通过对富水水库坝基渗压水头观测资料的整理分析,结合工程地质和除险加固历史,得出了富水水库坝基渗压水头与一般水库大坝表现规律的不同,并分析了其原因。主河床段防渗墙前坝基渗压水头测值和变幅相比库水位有大幅降低,其原因是在原河床段采用黏土铺盖增加了渗径;防渗墙后坝基渗压水头测值及变幅相比墙前大幅降低,这是混凝土防渗墙和泥墙共同作用的结果;主河床段防渗墙后测点渗压水头测值比下游坝基渗压水头低,其原因是测点布置高程和位置不同;主河床部分测点坝基渗压水头低于下游水位,其原因是下游尾水渠的布置和压渗工程导致下游水面远离下游坝体,同时大坝上游铺盖、防渗墙防渗效果良好。这些异常情况是大坝特殊的加固措施和地质条件引起的,表明大坝防渗加固效果良好,运行安全。
On the basis of analyzing the observation data of Fushui dam foundation seepage pressure and the reinforcement history and geological data,came to the conclusion that dam foundation seepage pressure of Fushui dam was different from the general change law and analyzed the reasons.Because of using clay blanket increased seepage path in the original riverbed segment,the measured values and amplitude of head drops before the cutoff wall significantly decreased than the reservoir water level. The measured values and amplitude of head drops before the cutoff wall significantly decreased than the data behind the cutoff wall. It was a synergy result of concrete cutoff wall and the mud wall. The measured values of head drops behind the cutoff wall in the main riverbed are lower than the downstream dam foundation seepage pressure,because the elevation and location of measuring points were different. Values of some stations in the main riverbed dam foundation were lower than the level of tail water. It was because that the arrangement of the downstream tailrace and seepage control project,leading to downstream water away from the downstream dam,meanwhile upstream dam blanket and cutoff wall had a good anti-seepage effect. The results show that those abnormalities are caused by the special reinforcement measures and geological conditions of Fushui dam and indicate that the dam seepage reinforcement has a good effect and the dam operates normally.
On the basis of analyzing the observation data of Fushui dam foundation seepage pressure and the reinforcement history and geological data,came to the conclusion that dam foundation seepage pressure of Fushui dam was different from the general change law and analyzed the reasons.Because of using clay blanket increased seepage path in the original riverbed segment,the measured values and amplitude of head drops before the cutoff wall significantly decreased than the reservoir water level. The measured values and amplitude of head drops before the cutoff wall significantly decreased than the data behind the cutoff wall. It was a synergy result of concrete cutoff wall and the mud wall. The measured values of head drops behind the cutoff wall in the main riverbed are lower than the downstream dam foundation seepage pressure,because the elevation and location of measuring points were different. Values of some stations in the main riverbed dam foundation were lower than the level of tail water. It was because that the arrangement of the downstream tailrace and seepage control project,leading to downstream water away from the downstream dam,meanwhile upstream dam blanket and cutoff wall had a good anti-seepage effect. The results show that those abnormalities are caused by the special reinforcement measures and geological conditions of Fushui dam and indicate that the dam seepage reinforcement has a good effect and the dam operates normally.
引文
[1]徐小定,王宏,董福昌.富水水库大坝渗流监测系统布置及资料初步分析[G]∥全国大坝安全监测技术信息网2008年度技术信息交流会暨全国大坝安全监测技术应用和发展研讨会论文集.北京:中国水力发电工程协会,2008:333-338.
[2]段亚辉,黄英豪.富水土坝溃坝成因有限元法仿真研究报告[R].武汉:武汉大学,2010.
[3]张澄子,贺敏,杨冬君,等.富水水库坝基渗漏处理方案选择及实施效果[J].中国水利,2008(12):76-80.
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[2]段亚辉,黄英豪.富水土坝溃坝成因有限元法仿真研究报告[R].武汉:武汉大学,2010.
[3]张澄子,贺敏,杨冬君,等.富水水库坝基渗漏处理方案选择及实施效果[J].中国水利,2008(12):76-80.
[4]湖北省富水水库管理局工程科.富水水库大坝安全监测(2011年度)资料汇编[R].湖北:湖北省富水水库管理局,2011.