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为了科学评价注浆浆液的抗分散性质与凝胶性能,设计速凝浆液抗分散性质试验装置,能够模拟浆液在未凝胶之前即受到动水冲刷的关键过程。利用该装置开展水泥水玻璃浆液与改性聚氨酯浆液的抗分散性质试验,并定义浆液留存率指标,对速凝浆液在动水条件下的抗分散性质进行定量评价。试验表明:水泥水玻璃浆液在较小动水流速条件下抗分散性能较好,随着动水流速的增大,浆液留存率迅速减小,其抗分散性质还受到水灰比、水泥浆与水玻璃体积比等因素的影响;改性聚氨酯浆液在较大动水流速条件下仍具有较高的浆液留存率,较水泥水玻璃浆液具有更为优良的抗分散性质和凝胶性能。根据速凝浆液抗分散性质与凝胶性能的试验分析结果,提出突水灾害治理注浆浆液的选择原则与综合治理措施。
In order to scientifically evaluate the anti-dispersion property and gel property of grouting slurry, the anti-dispersion property test device for quick-setting grout is designed to simulate the key process of slurry being washed by moving water before being gelled. The device was used to test the anti-dispersion properties of cement-based and modified polyurethane slurries. The index of the retention of the slurries was defined to evaluate the anti-dispersion properties of the quick setting slurry under the condition of moving water. The experimental results show that the anti-dispersion performance of cement-sodium silicate slurry is better under the condition of smaller water flow velocity. With the increase of water flow velocity, the retention rate of slurry decreases rapidly. The anti-dispersion property is also affected by the water-cement ratio, Water glass volume ratio and other factors; modified polyurethane slurry in the larger water flow rate conditions still have a higher slurry retention rate, compared with the cement water glass slurry has more excellent anti-dispersion properties and gel properties. According to the experimental results of the anti-dispersion properties and gel properties of quick-setting slurry, the selection principle and comprehensive control measures for grouting slurry under water inrush disaster were put forward.