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为考察大断面切眼掘进过程中不同施工顺序所引起的工程响应的差异,对两种常用方式进行了数值计算.通过对所得数据结果的分析处理得到:在巷道开挖中,围岩应力分布呈“蝴蝶”形分布,在左右两边向左上角、右上角两个方向演化扩展,为可能冲击中心区;分别选取切眼左右两侧和顶板37个点,得到其随不同掘进方式的应力变化规律,并以此分析了两帮冲击和顶板冲击的危险性,发现“先导硐再刷大”方案中右侧最易冲击;定义了广义应变能密度概念,并依据开掘过程中广义应变能密度的变化和冲击的相关性,初步提出针对特定工程的简易冲击准则.
In order to investigate the difference of engineering response caused by different construction sequences in the process of tunnel cutting with large section, two commonly used methods are calculated.The results of the analysis and processing of the obtained data show that in the tunnel excavation, the stress distribution of the surrounding rock Was “butterfly” shape distribution, in the left and right sides of the upper left corner of the upper right corner of the evolution of the two directions for the possible expansion of the impact of the central area; were selected on both sides of the left and right sides of the roof and 37 points, with its different driving methods The results show that the right side is the most vulnerable in the scheme of “pilot hole brushing big”, the concept of generalized strain energy density is defined, and the concept of generalized strain energy density Generalized strain energy density and impact of the impact of changes in the preliminary proposed for the specific project of the simple impact criteria.