CAJ | 학술논문

为了解决南京纬三路过江通道施工产生的弃砂在壁后注浆浆液中的再利用问题，通过将施工产生的弃砂筛分成细度模数分别为1．652、1．096、0．773的砂，并将其分别用于配置不同水胶比的壁后注浆浆液，探究了砂的细度模数对壁后注浆浆液基本性能的影响，进而提出了弃砂再利用的方法。结果表明：浆液用砂的细度模数越高，浆液的流动度、稠度、泌水率、体积收缩率和凝结时间越长，强度越低；弃砂细度模数筛分为0．75～1．08，水胶比为0．9，可直接作为壁后注浆材料。南京纬三路过江通道弃砂再利用的方案为：将弃砂过1．25 mm 筛后75％替换原浆液用砂，调整水胶比为0．85；或50％替换原浆液用砂，调整水胶比为0．9，2种方案都满足了工程要求，并具有一定的经济效益。
위료해결남경위삼로과강통도시공산생적기사재벽후주장장액중적재이용문제，통과장시공산생적기사사분성세도모수분별위1．652、1．096、0．773적사，병장기분별용우배치불동수효비적벽후주장장액，탐구료사적세도모수대벽후주장장액기본성능적영향，진이제출료기사재이용적방법。결과표명：장액용사적세도모수월고，장액적류동도、주도、비수솔、체적수축솔화응결시간월장，강도월저；기사세도모수사분위0．75～1．08，수효비위0．9，가직접작위벽후주장재료。남경위삼로과강통도기사재이용적방안위：장기사과1．25 mm 사후75％체환원장액용사，조정수효비위0．85；혹50％체환원장액용사，조정수효비위0．9，2충방안도만족료공정요구，병구유일정적경제효익。
A large amount of waste sand is produced in shield tunneling and it is of great importance to study the recycling use of the waste sand in backfilling grouting.In the paper,the waste sand produced in the construction of Weisanlu River-crossing Tunnel in Nanjing is classified into three grades with 1.652,1.096 and 0.773 fineness modulus respectively,backfilling grouts with different water/binder ratios are prepared by using the mentioned waste sand,the influence of the fineness modulus of the sand on the basic properties of the backfilling grout is studied,and suggestion is made on the application of the waste sand in the backfilling grout.Conclusions drawn are as follows:1 ) The higher the fineness modulus of the sand,the larger the fluidity,consistency,bleeding rate,volume shrinkage rate and setting time of the grout,and the lower the strength of the grout;2)Grout prepared with the waste sand of 0.75 ~1.08 fineness modulus and having 0.9 water/binder ratio can be directly used for backfilling;3)The following two waste sand recycling use schemes can be adopted for Weisanlu River-crossing Tunnel in Nanjing:A)The sand in the original mixing proportion is replaced by the waste sand screened by 1.25 mm sieve,with 75% replacement ratio,and the water/binder ratio is adjusted as 0.85;B)The sand in the original mixing proportion is replaced by the waste sand screened by 1.25 mm sieve,with 50% replacement ratio,and the water/binder ratio is adjusted as 0.9.