黏土压密注浆补偿效率评估方法研究

Research on the estimation method of compensation efficiency of clay compaction grouting

针对新建常德经益阳至长沙铁路站前工程,从注浆补偿效率损失机理出发,基于太沙基一维固结理论,对该工程黏土段压密注浆补偿效率进行研究。首先,以浆泡为界将黏土层分为上下两部分。而后,基于太沙基一维固结理论,对黏土层上下两层分别进行积分计算求得其固结沉降体积量,进而计算黏土压密注浆补偿效率值。利用现有文献的试验数据对本文所提出方法进行验证。最后,分析并讨论基于新建常德经益阳至长沙铁路站前工程注浆参数下注浆压力对注浆补偿效率的影响。研究结果表明:注浆补偿效率随着时间先减小而后在t=1000s后维持稳定,且注浆压力与注浆补偿效率的最终值成反比。所得结果可用于新建常德经益阳至长沙铁路站前工程黏土段溶洞注浆工程的设计和施工。

For the new Changde railway station from Yiyang to Changsha,based on the mechanism of grouting compensation efficiency loss and Terzaghi’s one-dimensional consolidation theory,the grouting compensation efficiency in clay is studied in this paper.Firstly,the clay layer was divided into two parts with the slurry bubble as the boundary,namely the upper part and the lower part.Then,based on Terzaghi’s one-dimensional consolidation theory,the consolidation settlement of the upper and lower layers was calculated by integral calculation respectively,and then the grouting compensation efficiency was calculated.The proposed method was verified by the experimental data of existing work.Finally,the influence of the grouting pressure on the grouting compensation efficiency is analyzed and discussed based on the grouting parameters of the New Changde railway station from Yiyang to Changsha.The results show that the grouting compensation efficiency first decreases with time,and then remains stable after t=1000 s,and the grouting pressure is inversely proportional to the final value of the grouting compensation efficiency.These results can be used for the design and construction of the karst cave grouting in the clay section of the New Changde railway station from Yiyang to Changsha.