岩质隧道机械胀裂数值模拟分析

发布时间：2018-02-14 03:01

本文关键词： 岩质隧道机械胀裂数值模拟施工技术参数　出处：《施工技术》2017年S1期 　论文类型：期刊论文

【摘要】：复杂环境下岩质隧道钻爆法施工将产生安全隐患。机械胀裂法利用岩石抗拉强度低的特点,以其有效的可控性和安全性,近年来在复杂环境下隧道开挖中得到越来越广泛应用。本文通过数值计算方法,模拟分析了岩质隧道机械胀裂全过程,得到如下结论:(1)针对III级围岩隧道开挖,采用钻孔间距0.7~0.75m、抵抗线0.5~0.6m,胀裂力150~160MPa等施工技术参数,可以有效保证胀裂效果;(2)通过比较相邻孔间切向应力值与岩石抗拉强度的大小来判断胀裂是合理的;(3)机械胀裂均会在保留岩体中产生一定程度的损伤,后续作业调整施工参数,即增大钻孔间距和抵抗线,减小胀裂力,可有效完成岩质隧道胀裂开挖作业。
[Abstract]:The construction of rock tunnel by drilling and blasting in complex environment will bring about hidden danger of safety. The mechanical dilatation and fracture method can make use of the characteristics of low tensile strength of rock to make use of its effective controllability and safety. In recent years, it has been more and more widely used in tunnel excavation in complex environment. In this paper, the whole process of mechanical dilatation of rock tunnel is simulated and analyzed by numerical calculation method. The conclusion is as follows: 1) excavation of III class surrounding rock tunnel. The construction technical parameters are adopted, such as the spacing of the borehole is 0.7 ~ 0.75 m, the resistance line is 0.5 ~ 0.6 m, the expanding force is 150 ~ 160 MPA, and so on. By comparing the tangential stress between adjacent holes and the tensile strength of rock, it is reasonable to judge that the expansion crack is reasonable. The mechanical expansion crack will cause damage to a certain extent in the reserved rock mass, and the construction parameters will be adjusted by subsequent operation. By increasing the distance between boreholes and resistance lines and reducing the expansion and crack force, the expansion and cracking of rock tunnel can be effectively completed.
【作者单位】：北京市政路桥股份有限公司;北京工业大学建筑工程学院;
【分类号】：U455.4

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