深部巷道围岩分区破裂带理论及试验对比研究

Comparison Research on Experiments and Theory of Zonal Disintegration Belt in Deep Tunnel Surrounding Rock

深部岩体巷道围岩分区破裂化现象形成机制一直存在较大争议。本文从应力波传播的角度对此问题进行了理论探索。以半圆型巷道围岩为对象,建立了巷道围岩应力波传播物理模型。对围岩区域波动方程进行了求解,得到巷道围岩区域应力波幅值分布呈波动衰减变化特征,创新性地提出了巷道围岩分区破裂带宽度及理论深度。以丁集矿井为对象,对其围岩分区中心半径进行理论计算并与实测结果进行对比研究,大部分分区半径吻合度较好。本文的研究成果对巷道围岩分区破裂化理论有一定的推进作用。

The formation mechanism of rock disintegration phenomenon of surrounding rock in deep rock mass tunnels has always been highly controversial.The article explores this issue theoretically from the perspective of stress wave propagation.A physical model of stress wave propagation in the surrounding rock of a semi-circular tunnel was established.The wave equation of the surrounding rock area was solved,and the amplitude distribution of stress waves in the surrounding rock area of the tunnel showed a characteristic of wave attenuation.The innovative proposal was made for the width and theoretical depth of the fracture zone in the surrounding rock area of the tunnel.Taking Dingji Mine as the object,the theoretical calculation of the central radius of the surrounding rock partition was carried out and compared with the measured results.Most of the partition radii were in good agreement.The research results of this article have a certain promoting effect on the theory of zoning and fracturing of surrounding rock in tunnels.