中文摘要：

为了研究冻结温度对砂质泥岩峰值强度、粘聚力、内摩擦角及残余强度的影响规律,分析围压与峰值强度、残余强度的关系,从甘肃新庄煤矿采集砂质泥岩,对加工后的岩样进行干燥和饱水处理,开展常温（＋20℃）和不同冻结温度（0℃、-5℃、-10℃、-20℃和-30℃）条件下单轴、三轴力学试验。研究结果表明：冻结温度对饱和状态下试件力学特性影响较大,温度由-5℃降到-30℃时,峰值强度提高了138.13%~161.60%,粘聚力提高了97.52%,残余强度提高了174.94%~324.30%,内摩擦角提高了15.09%,相对而言,冻结温度对内摩擦角影响小;冻结温度对干燥状态下岩石试件力学特性影响相对较小;同一温度条件下,试件峰值强度、残余强度均随围压增大而增大,经拟合呈线性关系,饱和状态下试件峰值强度、残余强度增加幅度大于干燥状态下的相应值。

英文摘要：

Sandy mudstone collected from Xinzhuang coal mine were processed into dry and saturated rock samples, then uniaxial and triaxial tests were carried out at the room temperature（ ＋ 20 ℃ ） and different freezing temperatures（0 ℃, -5 ℃, -10 ℃, -20 ℃and -30 ℃）. Effect of freezing tem- perature on the peak strength, cohesion, internal friction angle and residual strength were researched, the relationships between confining pressure and peak strength, residual strength were analyzed. The re- suits show that the impact of freezing temperature on the mechanical properties of the specimen under saturation is relatively great, and when the temperature decreases from - 5 ℃ to - 30 ℃, the peak strength increases by 138. 13%-161.60%, the cohesion increases by 97.52%, the residual strength in- creases by 174.94%-324. 30%, and the angle of internal friction increases by 15.09%. The impact of freezing temperature on the internal friction angle is relatively small. The peak strength and the residual strength of specimen increase with the confining pressure under the same temperature, and they fit a lin- ear relationship. The increases of peak strength and the residual strength of saturated specimen are greater than the corresponding increases in the dry state. 4 tabs, 10 figs, 12 refs.