西部极松软围岩条件下大断面巷道合理间距研究

Research on Reasonable Interval of Large Sectional Roadways in Western Extremely Loose and Soft Surrounding Rock

为了研究松软围岩条件下大断面巷道的合理间距,采用弹塑性力学分析和数值模拟方法,对巷道掘进后不同间距下的位移场、应力场、破坏场进行综合分析。研究表明:随着巷道间距变大,两帮和顶底板位移减小,并且变化速度也减小,两巷道之间的相互影响变小。巷道周围应力分布逐渐规则,位移矢量场变小,而变化速度明显减小;两条巷道塑性区交汇程度变少,且间距40 m往后,巷道互相干扰程度逐渐减小。

In order to find the reasonable distance of large section tunnel under loose and soft surrounding rock condition, we use elas- tic- plastic mechanical analysis and numerical simulation to comprehensively analyze tunneling displacement field, stress field and fracture field in different spacing. Studies show that with the increase of tunnel distance, the displacement of roadway sides and roof and floor is decreased, then the rate of the displacement is reduced, and the interaction between the two tunnels becomes less. The stress distribution around the tunnel is gradually regular. The displacement vector field is smaller, and the changed rate is significantly reduced ; the plastic inter - zone of two tunnels becomes less, the interference of the tunnels reduced after spacing of 40 m.