温湿效应对膨胀岩吸水软化作用的影响

试验通过控制水温,观察膨胀岩在水中崩解、软化的快慢,以及固体颗粒物粒径的大小,得出了温度对膨胀岩吸水崩解软化作用的影响规律。通过对各组温湿度状态下的膨胀岩进行直剪实验,获得了温湿度对膨胀岩抗剪强度的影响规律。结果表明:随着温度的升高,膨胀岩内部矿物颗粒吸水速率变快、吸水量增大、分子运动加速、膨胀作用增强,崩解速率也逐渐加快,吸水软化所需时间更短;温度的升高,加大了膨胀岩内部水分的蒸发,导致岩体失水收缩,内部结构变得紧密,水的润滑作用也减弱,膨胀岩的黏聚力和摩擦角均增大;随着含水率的增加,膨胀岩吸水发生体积膨胀,分子间吸引力减小,内部矿物颗粒胶结变得松散,水的润滑作用加强,黏聚力和摩擦角均降低。

The influence of temperature and humidity effect on water absorption softening of swelling rock

Test through controlling the temperature of water and observing the disintegration and softening speed of swelling rock in water ,also the size of solid particle size after disintegration and softening,the influence law of temperature on water absorption disintegration and softening of swelling rock were gained.By direct shear experiment of swelling rock under the condition of each groups temperature and humidity, the influence law on shear strength of swelling rock were obtained.Results shows:with the increase of temperature, the swelling rock internal mineral particle absorption rate becomes faster, the water absorption increased, molecular motion accelerated, expansion effect enhanced, disintegration rate has gradually accelerated, Water absorption softening time become shorter.The increase of temperature increased the evaporation of swelling rock internal water , resulting in shrinkage of rock mass and the internal structure compacted, lubrication of water also reduced, the cohesion and friction angle of swelling rock increased.With the increase of ambient humidity,the volume of swelling rock will expansion after absorbing water,intermolecular attraction decreased and mineral particles become loose,lubrication of water enhanced,cohesion and friction angle of swelling rock decreased.