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室温下的应变实验表明 ,低孔隙度的结晶岩如花岗岩、片麻岩、闪长岩和变基性岩 ,水饱和时膨胀 ,干燥时收缩 ,这种效应是可重复的 .用水的吸附和解吸 (在相对湿度下 ) ,也可以观察到膨胀和收缩 .膨胀效应是由于表面力 (VanderWaals吸引、双电层排斥及溶剂化排斥 )引起的 .水饱和体应变约为其孔隙度的 1 /1 0 .用庚烷饱和的体应变比用水饱和的小 .用CaCl2 溶液饱和的应变随着盐克分子浓度的增加而减小 .杨氏模量E、切变模量G、品质因数Q的准静态测量表明 ,随着相对湿度的增加 ,E、G、Q减少 ,吸附水的增加改变了孔隙内表面分子的相互作用力 .大约在岩石孔隙表面吸附达到 3个水分子层时 ,可观察到最强烈的膨胀效应 .
Strain experiments at room temperature have shown that low-porosity crystalline rocks such as granites, gneiss, diorites and metamorphic rocks swell when saturated with water and shrink when dry, and this effect is reproducible. Water adsorption and Desorption (at relative humidity) can also be observed in both expansion and contraction. The swelling effect is due to surface forces (VanderWaals attraction, electric double layer repulsion and solvation repulsion) .The water saturation body strain is about 1 / The volumetric strain saturated with heptane is smaller than that saturated with water.The strain saturated with CaCl2 solution decreases with the increase of the molecular concentration of the salt.The Young’s modulus E, the shear modulus G, the quality factor Q Quasi-static measurements show that as the relative humidity increases, E, G and Q decrease, and the increase of adsorbed water changes the interaction force of the molecules on the inner surface of the pores. When the adsorption on the rock pore surface reaches three water molecules, it can be observed To the strongest expansion effect.