Jinpeng Zhang, Limin Liu, Futao Zhang, Junzhi Cao
College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, 266590, China.
Shandong ark New Material Co., Ltd, Tai'an, Shandong, Taian, 271026, China.
Sci Rep. 2018 Apr 4;8(1):5642. doi: 10.1038/s41598-018-23995-y.
With cement, bentonite, water glass, J85 accelerator, retarder and water as raw materials, a new composite grouting material used to seal groundwater inflow and reinforce wall rock in deep fractured rock mass was developed in this paper. Based on the reaction mechanism of raw material, the pumpable time, stone rate, initial setting time, plastic strength and unconfined compressive strength of multi-group proportion grouts were tested by orthogonal experiment. Then, the optimum proportion of composite grouting material was selected and applied to the grouting engineering for sealing groundwater inflow and reinforcing wall rock in mine shaft lining. The results show the mixing proportion of the maximum pumpable time, maximum stone rate and minimum initial setting time of grout are ABCD, ABCD and ABCD, respectively. The mixing proportion of the maximum plastic strength and unconfined compressive strength of grouts concretion bodies are ABCD and ABCD, respectively. Balanced the above 5 indicators overall and determined the optimum proportion of grouts: bentonite-cement ratio of 1.0, water-solid ratio of 3.5, accelerator content of 2.9% and retarder content of 1.45%. This new composite grouting material had good effect on the grouting engineering for sealing groundwater inflow and reinforcing wall rock in deep fractured rock mass.
以水泥、膨润土、水玻璃、J85速凝剂、缓凝剂和水为原料，研制了一种用于封堵深部裂隙岩体地下水涌水和加固围岩的新型复合注浆材料。基于原料的反应机理，通过正交试验对多组配比浆液的可泵时间、结石率、初凝时间、塑性强度和无侧限抗压强度进行了测试。然后，选取复合注浆材料的最优配比，并应用于井筒衬砌封堵地下水涌水和加固围岩的注浆工程。结果表明，浆液最大可泵时间、最大结石率和最小初凝时间的配合比分别为ABCD、ABCD和ABCD。浆液结石体最大塑性强度和无侧限抗压强度的配合比分别为ABCD和ABCD。综合平衡上述5项指标，确定了浆液的最优配比：膨润土与水泥质量比为1.0，水固比为3.5，速凝剂含量为2.9%，缓凝剂含量为1.45%。这种新型复合注浆材料在深部裂隙岩体封堵地下水涌水和加固围岩的注浆工程中效果良好。
