不同地层盾构泥砂对制备同步注浆材料性能影响研究

A Study on Producing Synchronous Grouting Materials Using Muck Collected in Shield Tunneling in Different Strata

为找到工程废弃泥砂有效再利用的方法,通过对不同性质盾构泥砂制备同步注浆材料性能的分析,研究了不同颗粒组成、不同塑性指数的盾构泥砂对制备的同步注浆材料工作性能、力学性能及抗水分散性能的影响。结果表明:黏粒含量为10%～30%、含砂量为40%～70%的盾构泥砂制备的同步注浆材料的流动性、稳定性、力学性能与抗水分散性能均能达到设计要求,对不处于上述范围的盾构泥砂提出了矫正方法。所制备的同步注浆材料应用于武汉地铁工程,应用结果表明:盾构掘进轴线精度控制在5 cm以内,管片上浮和地表沉降都小于3 cm,注浆效果良好。

A study on producing synchronous grouting materials using mucks collected in shield tunneling in different strata is carried out, so as to find new ways for the effective recycling of mucks produced in shield tunneling. The influ- ence of the clay content and plasticity index of the mucks on the performance, mechanical properties and water disper- sion resistance of the synchronous grouting materials produced is studied. The result shows that the fluidity, stability, mechanical properties and water dispersion resistance of the synchronous grouting materials produced using mucks with 10% -30% clay content and 40% -70% sand content meet the design requirements. For mucks with their clay and sand content outside the above-mentioned range, correction methods are proposed. Synchronous grouting materials pro- duced using mucks collected in shield tunneling are trialed in the construction of Wuhan Metro and good results are a- chieved, with the accuracy of the axial line of shield driving controlled within 5 cm, and the uplifting of segment lining and the ground settlement being less than 3 cm.