和畅洲左汊口门潜坝加固现场试验研究
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摘要
长江镇扬河段和畅洲左汊口门潜坝加固工程包括坝顶的尼龙网石兜和坡面的块石防护工程2部分。由于水下潜坝加固的设计工程量补偿系数及施工方法没有相关的规程规范和经验可借鉴,因此,为研究尼龙网石兜及块石抛投施工定位方法,确定抛石与抛投尼龙网石兜的设计工程量补偿系数,开展了现场抛投尼龙网石兜与抛石试验研究。根据现场试验结果,计算分析确定了坝顶及坝肩抛尼龙网石兜设计工程量补偿系数为1.2,水下坝坡面抛石设计工程量补偿系数为1.5;并结合理论分析,推导了尼龙网石兜漂距及石块漂距的计算公式,由试验数据反算出了尼龙石兜和块石的阻力系数。该研究成果已运用于长江镇扬河段和畅洲左汊口门潜坝加固工程的设计和施工中,达到了预期目的。
The strengthening work of submerged dike at Hechangzhou left braded channel consists of two parts: rock riprap( with nylon cage) on the dike crest and slope protection by rock blocks. Since there is no related specification or experience in determining the compensation coefficient of engineering quantity and construction technique,field tests were conducted for the construction positioning,the detailed technique of rock riprap( with nylon cage),and the compensation coefficient of engineering quantity. Through the field tests,construction positioning was determined,and according to the test results,the compensation coefficient of engineering quantity of riprap at dam crest and dam abutment is 1. 2,the compensation coefficient of engineering quantity at underground dam slope is 1.5. Moreover,the calculation formula of the riprap's and nylon riprap's drift distance were derived,and in association with the field test,the riprap's and nylon riprap's drag coefficient was calculated. The research achievements have been applied to the design and construction of strengthening work of submerged dike at Hechangzhou left braded channel,and achieved expected results.
The strengthening work of submerged dike at Hechangzhou left braded channel consists of two parts: rock riprap( with nylon cage) on the dike crest and slope protection by rock blocks. Since there is no related specification or experience in determining the compensation coefficient of engineering quantity and construction technique,field tests were conducted for the construction positioning,the detailed technique of rock riprap( with nylon cage),and the compensation coefficient of engineering quantity. Through the field tests,construction positioning was determined,and according to the test results,the compensation coefficient of engineering quantity of riprap at dam crest and dam abutment is 1. 2,the compensation coefficient of engineering quantity at underground dam slope is 1.5. Moreover,the calculation formula of the riprap's and nylon riprap's drift distance were derived,and in association with the field test,the riprap's and nylon riprap's drag coefficient was calculated. The research achievements have been applied to the design and construction of strengthening work of submerged dike at Hechangzhou left braded channel,and achieved expected results.
引文
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