岩体非饱和带水分汽液相态转化规律研究

目前关于非饱和带裂隙岩体水分汽液转化规律的研究较少,但在实际工作中,常需要考虑岩体内部水分汽液相态相互转化对岩体造成的影响。以河南宜阳锦屏山为试验场,利用Apresys179-DTH温湿度记录仪对试验场岩壁水汽进行长期监测,从热力学角度研究非饱和带裂隙岩体内部水分汽液转化规律。结果表明:温度是决定水汽运移和液态水产生的关键因素,绝对湿度的变化规律与温度的变化有极强的相关性;春夏两季外界水汽向裂隙岩体移动,绝对湿度上升;秋冬两季裂隙岩体中的水汽向外界移动,绝对湿度下降;裂隙岩体绝对湿度含量较高的时段为22:00点至次日6:00,该时段内易产生液态水,14:00~16:00时,虽然监测孔内水汽含量较高,但难以达到或超过对应温度下的饱和蒸气压,液态水不易产生。

Study on water vapor-liquid transformation in unsaturated zone of fractured rock mass

At present, there are few studies on the law of water phase-change between vapor and liquid in unsaturated zone of fractured rock, but in practical work, we need to consider the influence of the vapor-liquid transformation on rock mass. Taking Jinping Mountain in Yiyang, Henan Province as an example, we studied the law of water vapor-liquid transformation in unsaturated zone of fractured rock mass from the view of thermodynamics by long-term observation of the vapor on rock wall in the test site using the Apresys 179-DTH temperature and humidity recorder. The results show that temperature is the key factor to determine the movement of water vapor and the yield of liquid water. And the variation law of absolute humidity has a strong correlation with temperature. During the spring and summer, the external water vapor moves into the fractured rock mass so that the absolute humidity rises, while in autumn and winter, the water vapor in the fractured rock mass moves to the outside, and the absolute humidity decreases. There exists a relatively high content of moisture in fractured rock mass in the period from 22:00 to 6:00 in a day, and during that time liquid water yields easily. On the contrary, although the absolute humidity of water vapor is high in the monitoring hole from 14:00 to 16:00 in a day, it is difficult to reach or exceed the saturated vapor pressure under the corresponding condition of temperature, so liquid water is not easy to yield.