水泥-水玻璃浆液（C-S浆液）作为常用的注浆浆液，浆液性能受温度变化而改变，常温灌浆方案不适合高温灌浆。添加膨润土改善C-S浆液的高温性能，探究高温作用下膨润土对C-S浆液性能的影响，对比20 ℃和80 ℃温度下钠基膨润土和钙基膨润土对C-S浆液流变性能和结石体性能的影响规律，并通过XRD和SEM-EDS分析探讨其工作机制。结果表明： 1）80 ℃高温会降低C-S浆液黏度、屈服应力，增加浆液流动度，掺入膨润土能增加C-S浆液黏度、屈服应力，降低流动度，这对高温突涌水灾害注浆治理过程中防止浆液流失有积极效果； 2）80 ℃高温能够促进C-S浆液结石体早期强度的提升，但是对结石体长期强度、抗渗性能有负面影响，而膨润土的掺入可以改变结石体孔隙结构，降低孔隙率，从而提升抗渗性能； 3）80 ℃高温可以促进膨润土参与后期化学反应，优化C-S浆液结石体矿物相组成，改变微观结构性能，对注浆加固后期的稳定性有积极影响。

Cement-sodium silicate (C-S) grout is commonly used as a quick-setting grout, with its performance varying based on temperature. Conventional grouting methods designed for normal temperatures are unsuitable for high-temperature conditions; however, the addition of bentonite can enhance the workability of C-S grout at high temperature. The authors investigate the effects of sodium and calcium bentonite on the rheological and mechanical properties of C-S grout at 20 ℃ and 80 ℃. The mechanisms underlying these effects are analyzed using X-ray diffraction and scanning electron microscopy-energy dispersive spectrometry. The findings are as follows: (1) At 80 ℃, the viscosity and yield stress of C-S grout decrease, while flowability increases. Bentonite enhances viscosity and yield stress while reducing flowability, which helps prevent grout loss during high-temperature water outburst mitigation. (2) Elevated temperature accelerates early strength development in the solidified grout but negatively impacts long-term strength and impermeability. Bentonite modifies the pore structure and decreases porosity, thereby improving impermeability. (3) High temperature promotes the participation of bentonite in late-stage chemical reactions, altering the microstructural properties by optimizing the mineral phase composition of the solidified grout, thereby enhancing the stability of grouting reinforcement over time.