气温变化对隔河岩水电站岩体边坡位移场的影响

现场监测发现,边坡位移随时间起伏变化,怀疑其影响因素之一可能是气温变化.为此,通过对隔河岩水电站厂房岩体边坡温度位移场的计算分析,发现气温对边坡位移有影响,但影响较小,影响的位移量为毫米级,而实测位移的起伏变化为厘米级;计算位移的起伏变化周期为年,实测位移起伏变化的周期不明显.因此,气温变化不是边坡位移起伏的主要因素.但计算发现了一些气温变化影响位移的有趣规律,如位移变化滞后气温变化35～75d;气温影响边坡岩体的深度约10m;岩体深部的稳定温度约为17℃等.

Effect of air temperature variation on displacement field of rock slope at Geheyan Hydropower Station

According to in-situ monitoring data, the displacement of rock slope varies with time, and the variation of air temperature is doubted to be one of the influencing factors. Through the calculation of the temperature and displacement fields for the rock slope of the powerhouse of the Geheyan Hydropower Station, it is found that the influence of air temperature on the displacement of the slope is only in the range of several millimeters, while the fluctuation of measured displacement is in the range of several centimeters; besides, the fluctuation of calculated displacement is annually changed, while the variation of measured displacement shows no obvious periodicity. Therefore, the variation of air temperature is not the main factor affecting the displacement of the slope. Moreover, some regularities about the displacement varying with air temperature are also found through calculation: the variation of displacement lags behind that of air temperature for 35-75 days; the influence of air temperature on rock mass can reach a depth of 10 m; the steady temperature of rock mass is about 17?℃, etc.