CAJ | 학술논문

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。
대패패기석출물시대패건성축수후교위보편존재적현상。기우현유관우대패패기석출물적연구，결합근년래대소랑저대패진행적안전정검공작，채용현장조사、취양분석급다수단화험등방법，재논술소랑저패기석출물기본특정급형성궤리적기출상，종합평개패기석출물대대패안전운행잠재적영향。분석표명：현계단패기우안1＃배수동、좌안30＃배수동수지하수화학국부잠식교대，수대대패패기강도급은정성영향불대，단화학잠식시궤계관용등적선도，수가강감측；령외，패기수질중함대량활약미생물，미생물대패기암체등적영향연구환유대심화；이좌안30＃배수공배수구침적물함대량규、려급개물질，차소실량교대，수진일보통과정기취양、분석，진행정량평개。
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 .