高原地区高地应力隧道岩爆预判方法

Prognosis method of rockburst in tunnel with high geostress in plateau areas

盆因拉隧道是新建拉萨至日喀则铁路的关键性控制工程,在盆因拉隧道的施工时岩爆频发。对隧道岩爆地质段的岩性进行了现场测试及室内试验,依据试验结果,分别采用岩石弹性应变指数、最大储存弹性应变指标、强度脆性系数等指标对岩爆倾向进行了预测,可对工程施工予以指导。

T he PenYinLa T unnel is a key project of the new Lhasa-Shigatse Railway. T he Rockburst occurred frequently during the construction. T he lithology analysis w as conducted w ith a field test and a lab test. Based on the test results,three parameters were used to predict the rockburst： the index of rock elastic strain,the index of the maximum storage of elastic strain and the brittleness coefficient. T his prediction can be applied to the engineering construction.