山岭隧道开挖应力释放率研究

发布时间：2019-03-02 14:20

【摘要】：在隧道开挖与支护过程的数值分析中,确定隧道开挖应力释放率是比较困难的一个问题。本文通过数值模拟方法,分析了围岩等级、开挖形状、开挖尺寸、隧道埋深以及侧压力系数等5个因素对隧道开挖应力释放率的影响程度。结果表明:影响开挖应力释放率的主要因素为围岩等级,并得到不同等级围岩隧道开挖应力释放率取值范围;其余4个因素对开挖应力释放率影响相对较小,为次要因素。因此,在数值模拟隧道开挖时,可以主要依据围岩等级来确定隧道开挖应力释放率。
[Abstract]:In the numerical analysis of tunnel excavation and support process, it is difficult to determine the stress release rate of tunnel excavation. In this paper, the influence degree of surrounding rock grade, excavation shape, excavation size, tunnel buried depth and lateral pressure coefficient on the stress release rate of tunnel excavation is analyzed by numerical simulation method. The results show that the main factor influencing the excavation stress release rate is the surrounding rock grade, and the range of the excavation stress release rate of different grade surrounding rock tunnel is obtained, and the other four factors have relatively little influence on the excavation stress release rate, which is the secondary factor. Therefore, in the numerical simulation of tunnel excavation, the stress release rate of tunnel excavation can be determined mainly according to the grade of surrounding rock.
【作者单位】：上海交通大学船舶海洋与建筑工程学院;
【分类号】：U455

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