【摘要】 <正>西藏土门格拉煤矿于1964年11月—1967年5月先后开拓竖井、斜井及平硐进行井下开采。竖、斜井以平硐连通(图1)。为取得多年冻土地区进行井下开采确定合理的通风方法、予测围岩融化层的变化、以及评价井巷工程稳定性的科学依据,我们曾在开拓和运营期间对井巷气温、围岩温度、融化圈的形成以及稳定性作了系统观测研究。本文更多还原

【Abstract】 Observations of thermal state in the tunnel of Tumegela Coal Mine show that the freezing circle and the thawing circle formed near the. entrance of the tunnel change according to the variation of seasonal temperature and strongly affect the stability of it. In addition, it is also obviously influenced by the water content of the frozen soil, the property of the rock, and the degree of cracking and fragmentation. Substatial suggestions for the stability of the tunnel :1) rational ventilation is necessary to keep the rock in frozen or to prevent it from perpetual thawing, 2)heatig facilities must be kept at a definite distance from the entrance of the tunnel, 3)tunnel dug in the frozen soil must be properly framed soon after digging was raised.更多还原