红水河
紅水河
홍수하
HONGSHUI RIVER
2014年
1期
43-46
,共4页
东平湖围坝加固工程%截渗墙%加固设计
東平湖圍壩加固工程%截滲牆%加固設計
동평호위패가고공정%절삼장%가고설계
Strengthening works for box dam of Dongping Lake%cut-off wall%strengthening design
东平湖围坝加固工程,最初的截渗墙加固方案,是按墙体深度22 m为界,深度在22 m以内的堤段采用深层水泥土搅拌桩截渗墙,墙体深度在22~27 m的堤段采用振冲防渗板截渗墙,截渗墙深度超过27 m的堤段采用混凝土截渗墙。在施工过程中,采用的振冲防渗板截渗墙和混凝土截渗墙施工较为困难,施工造价高,尤其在有深浅不一的地下障碍物以及钙质结核层时很难保证施工的正常进行。为此对截渗墙深度超过22 m和地下有障碍物的堤段进行优化。通过分析研究,采取深层水泥土深层搅拌与高喷相结合水泥土截渗墙相结合方法,解决了黄河堤防水泥土搅拌桩不能处理深层、不良地基、适应能力差和高摆喷截渗墙成本高的难题。且施工工艺成本低,取得较好的经济效益。
東平湖圍壩加固工程,最初的截滲牆加固方案,是按牆體深度22 m為界,深度在22 m以內的隄段採用深層水泥土攪拌樁截滲牆,牆體深度在22~27 m的隄段採用振遲防滲闆截滲牆,截滲牆深度超過27 m的隄段採用混凝土截滲牆。在施工過程中,採用的振遲防滲闆截滲牆和混凝土截滲牆施工較為睏難,施工造價高,尤其在有深淺不一的地下障礙物以及鈣質結覈層時很難保證施工的正常進行。為此對截滲牆深度超過22 m和地下有障礙物的隄段進行優化。通過分析研究,採取深層水泥土深層攪拌與高噴相結閤水泥土截滲牆相結閤方法,解決瞭黃河隄防水泥土攪拌樁不能處理深層、不良地基、適應能力差和高襬噴截滲牆成本高的難題。且施工工藝成本低,取得較好的經濟效益。
동평호위패가고공정,최초적절삼장가고방안,시안장체심도22 m위계,심도재22 m이내적제단채용심층수니토교반장절삼장,장체심도재22~27 m적제단채용진충방삼판절삼장,절삼장심도초과27 m적제단채용혼응토절삼장。재시공과정중,채용적진충방삼판절삼장화혼응토절삼장시공교위곤난,시공조개고,우기재유심천불일적지하장애물이급개질결핵층시흔난보증시공적정상진행。위차대절삼장심도초과22 m화지하유장애물적제단진행우화。통과분석연구,채취심층수니토심층교반여고분상결합수니토절삼장상결합방법,해결료황하제방수니토교반장불능처리심층、불량지기、괄응능력차화고파분절삼장성본고적난제。차시공공예성본저,취득교호적경제효익。
The preliminary strengthening scheme for box dam of Dongping Lake,taking the wall depth of 22m as the boundary,proposed a deep soil cement mixing pile cut-off wall for the embankment section with wall depth within 22m;a vibroflotation anti-seepage plate cut-off wall for the embankment section with wall depth between 22~27m;and a concrete cut-off wall for the embankment section with wall depth over 27m. During the construction, it was rel-atively difficult in construction with vibroflotation anti-seepage plate cut-off wall and concrete cut-off wall, and the construction cost was high;even normal construction could not be guaranteed where irregular underground obstacles and calcareous concretion stratum were encountered. Thus the embankment section with the cut-off wall depth over 22m and with underground obstacles should be optimized. According to analysis and study, the soil cement cut-off wall by soil cement deep mixing and high pressure jet grouting, which brings low construction cost and better econom-ic benefits and leads to a solution of such problems of Yellow River embankment as failure to handle the deep stratum by the soil cement mixing pile, unfavorable foundation, poor adaptability and high cost for high pressure swing jet grouting cut-off wall,is determined to be applied.