小浪底大坝坝基析出物分析与评价  

Analysis and Evaluation of the Precipitates on the Foundation of Xiaolangdi Dam

作　　者：李占省[1] 

机构地区：[1]黄河水利水电开发总公司,河南洛阳410114

出　　处：《水利与建筑工程学报》2015年第1期198-201,共4页Journal of Water Resources and Architectural Engineering

摘　　要：大坝坝基析出物是大坝建成蓄水后较为普遍存在的现象。基于现有关于大坝坝基析出物的研究,结合近年来对小浪底大坝进行的安全定检工作,采用现场调查、取样分析及多手段化验等方法 ,在论述小浪底坝基析出物基本特征及形成机理的基础上,综合评价坝基析出物对大坝安全运行潜在的影响。分析表明:现阶段坝基右岸1#排水洞、左岸30#排水洞受地下水化学局部潜蚀较大,虽对大坝坝基强度及稳定性影响不大,但化学潜蚀是机械管涌等的先导,需加强监测;另外,坝基水质中含大量活跃微生物,微生物对坝基岩体等的影响研究还有待深化;而左岸30#排水孔排水沟沉积物含大量硅、铝及钙物质,且烧失量较大,需进一步通过定期取样、分析,进行定量评价。It is a widespread phenomenon that as soon as the the dam is built ,its foundation starts to produce precipi-tates .Based on the existing research on precipitates on the dam foundation ,combined with the safety inspection work scheduled for the Xiaolangdi dam in recent years ,field investigations were carried out ,and then samples were collected and analyzed in various methods .The basic characteristics and formation mechanism of the precipitates were discussed to evaluate the potential impact of the precipitates on the safe operation of the dam .The analysis indicates that at present stage ,1# drainage hole on the right bank of the dam and 30# drainage hole on the left bank are afflicted by subsurface erosion of the chemicals in the groundwater ,however the erosion does not have a great impact on the strength and the sta-bility of the dam foundation ,but it is the precursor of the mechanical piping ,so regular monitoring is necessary .In addi-tion ,there are a large number of active micro-organisms in the water of the dam foundation area ,its impact on the dam foundation rock remains to be further researched;meanwhile there is quite amount of substances that contain silicon ,alu-minum and calcium in the sediments of the 30# drainage hole gutter on the left bank of the dam ,which is yet to be sam-pled ,analyzed and evaluated at regular intervals .

关 键 词：小浪底大坝 坝基 析出物 潜在影响 

分 类 号：TV697.2[水利工程—水利水电工程]