大坝与安全
大壩與安全
대패여안전
LARGE DAM & SAFETY
2009年
2期
5-8
,共4页
红层%混凝土坝%坝基渗流破坏%抗滑稳定
紅層%混凝土壩%壩基滲流破壞%抗滑穩定
홍층%혼응토패%패기삼류파배%항활은정
cretaceous period layer,concrete dams%dam foundation seepage destroy%stability against sliding
白垩纪粘土质粉沙岩(俗称红层)具有亲水性.遇水软化、泥化、膨胀和失水干缩等特性,水库蓄水后,混凝土坝基常产生异常变形、渗流破坏、沿建基面滑动等问题,因而对红层上筑坝常有些忌讳.纪村电站是上世纪70年代在红层上建筑的小型电站,由于对红层特性认识不足,缺乏红层上筑坝经验,蓄水后最大泥化面积达108m2,摩擦系数明显降低,部分坝基扬压力很高,局部坝基面脱开,较多排水孔排出的水体中携带泥质沉积物.经多次处理,封闭了混凝土重力坝坝基,增加了防渗墙,完善了防渗铺盖,延长了渗径,放缓了渗流坡降,形成一个完整渗流控制系统,现工程已安全运行30年,其经验教训可供同类工程参考.
白堊紀粘土質粉沙巖(俗稱紅層)具有親水性.遇水軟化、泥化、膨脹和失水榦縮等特性,水庫蓄水後,混凝土壩基常產生異常變形、滲流破壞、沿建基麵滑動等問題,因而對紅層上築壩常有些忌諱.紀村電站是上世紀70年代在紅層上建築的小型電站,由于對紅層特性認識不足,缺乏紅層上築壩經驗,蓄水後最大泥化麵積達108m2,摩抆繫數明顯降低,部分壩基颺壓力很高,跼部壩基麵脫開,較多排水孔排齣的水體中攜帶泥質沉積物.經多次處理,封閉瞭混凝土重力壩壩基,增加瞭防滲牆,完善瞭防滲鋪蓋,延長瞭滲徑,放緩瞭滲流坡降,形成一箇完整滲流控製繫統,現工程已安全運行30年,其經驗教訓可供同類工程參攷.
백성기점토질분사암(속칭홍층)구유친수성.우수연화、니화、팽창화실수간축등특성,수고축수후,혼응토패기상산생이상변형、삼류파배、연건기면활동등문제,인이대홍층상축패상유사기휘.기촌전참시상세기70년대재홍층상건축적소형전참,유우대홍층특성인식불족,결핍홍층상축패경험,축수후최대니화면적체108m2,마찰계수명현강저,부분패기양압력흔고,국부패기면탈개,교다배수공배출적수체중휴대니질침적물.경다차처리,봉폐료혼응토중력패패기,증가료방삼장,완선료방삼포개,연장료삼경,방완료삼류파강,형성일개완정삼류공제계통,현공정이안전운행30년,기경험교훈가공동류공정삼고.
Because of no experience, the Jicun hydropower station is built on the cretaceous period layer. After water impounding,problems were encountered such as the 108 m2 sludging area, much lower friction coefficients, high uplift pressure at dam foun-dation, partly disengaging of dam foundation surface and argillaceous sediment in discharge water. By many treatments, the inte-grated anti-seepage system was formed. Till now, it has been in operation more than 30 years, and its experience and lessons are worthy reference for same projects.
