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为研究饱水对砂岩力学参数和能量特征的影响,利用RMT-150B岩石力学系统对煤层顶板砂岩自然和饱水试样进行单轴压缩试验。试验结果表明:饱水对砂岩试样的强度和变形参数均有不同程度的影响,软化系数为0.79,弹性模量降幅为5.25%,变形模量降幅为5.92%;饱水后砂岩试样峰值前吸收能量、可释放弹性能和耗散能均有不同程度降低,吸收能量降幅36.8%,可释放弹性能降幅为34.4%,耗散能降幅为57.7%;饱水后砂岩储蓄能量的能力有较大减弱,脆性减弱,塑性明显增强;饱水砂岩试样压缩过程中积蓄可释放能难以使试样滑移破坏,仍需要吸收部分能量使试样逐步失稳破坏;饱水对砂岩试样压缩过程吸收能量、可释放能量比例关系的影响较小,而对耗散能比例关系的影响较大;自然状态下砂岩试样峰值前相同应变条件下吸收能量、可释放能均明显高于饱水试样对应能量值;深部巷道位置确定和支护设计时应充分考虑水对巷道围岩弱化的影响,对于完整坚硬围岩采用高压注水软化可有效防止冲击地压发生和减缓灾害程度。
In order to study the influence of saturated water on the mechanical parameters and energy characteristics of sandstone, the natural and saturated samples of sandstone on the roof of coal seam were tested by using the RMT-150B rock mechanics system. The experimental results show that the saturated water has different degrees of influence on the strength and deformation parameters of the sandstone samples, the softening coefficient is 0.79, the elastic modulus is decreased by 5.25% and the deformation modulus is decreased by 5.92% The absorbed energy, released elastic energy and dissipated energy both decreased to some extent, the energy absorption decreased by 36.8%, the releasable energy decreased by 34.4% and the dissipation energy decreased by 57.7% Larger weakened, brittleness decreased, the plasticity was significantly enhanced; saturated sandstone samples can be released during storage can be difficult to make the sample slip damage, still need to absorb some of the energy to gradually destabilize the sample damage; saturated sandstone sample In the process of compressing, the absorbed energy and the releasable energy have a smaller influence on the proportional relationship, but have a greater influence on the energy dissipation ratio. Under natural conditions, the absorbed energy and releasable energy of sandstone sample under the same strain before peak- Water sample corresponding energy value; deep laneway location determination and support design should take full account of the impact of water on the weakening of the surrounding rock roadway, for the complete hard surrounding rock using high pressure water softening can effectively prevent the occurrence of rockburst Slow down the extent of the disaster.