原岩应力分布状态在地下巷道设计中的应用

INTACT ROCK STRESS DISTRIBUTIVE IS APPLIED IN DESIGNING OF TUNNEL

地下巷道开挖后，其周围应力产生重新分布，形成二次应力状态，产生应力集中。利用二次应力函数σ＝ｆ（σ０），推导出空间二次应力函数的表达式。通过实例计算，研究了不同原岩应力状态下巷道断面上应力椭圆形状和二次应力的大小，进而得出巷道的走向与最大主应力的关系。

After a tunnel is dug underground rock with stress, some change around the tunnel will occur, and the secondary stress distribution will form ,then the stress concentration will take place.Using the secondary stress function σ=f(σ 0), we deduce formula of space secondary stress function. With examples, there are different shape of stress ellipse on the tunnel from different intact rock stress attitude and numeral data of the secondary stress. By analyzing, the relationship between trend of a tunnel and the biggest main stress of intact rock is attained.