立井井壁温度变化规律实测研究

Field measurement research on temperature changing law of vertical shaft lining

为掌握生产期间主井、副井和风井井壁温度的变化规律,开展了实测研究。结果表明:进风井内井壁温度随风流温度的变化而变化,主井和副井的全年温度变化量分别为21℃、22℃,可近似表示为以年为周期的正弦函数;出风井井壁全年温度变化量约2℃,可近似忽略。分析认为:因井壁受热伸长受到围岩的约束而产生的竖直附加力是导致井壁破裂的原因之一。因此,进行井壁安全监测时,进风井必须监测温度变化,而出风井可不必监测温度变化。

In order to obtain the temperature variation laws in shaft linings of main shaft, auxiliary shaft and ventilating shaft which are in service, field measurements were carded out. Measurement results are as follows： the temperature in the linings of intake air shafts varies with the temperature of air current, the ranges of the annual temperature variation in main shaft and auxiliary shaft are 21℃ and 22℃ respectively, and the law of the temperature variation can be approximately expressed as a sine function of time with a period of 1 year; the value of the annual temperature variation in the lining of outtake air shaft is about 2℃, therefore it can be approximately ignored. According to the analyses on the basis of the measured data, when the temperature rises, the shaft lining will axially stretch, but it is subject to the constraint of the surrounding soils, so a vertical additional force on the outer surface of the shaft lining acted by soils occurs, the vertical additional force is one of the causes of the shaft lining rupture. On this account, when we monitor the safety of shaft lining, we have to measure the temperature in the lining of intake air shaft, but we do not have to do this in outtake air shaft.