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本文用光弹分析方法对巷道自支撑岩石环的模型进行了全场的应力分析。对几种形式的自支撑岩石环进行了比较,有圆孔、六槽和二次卸载槽等。并直接由光弹信息用边界元法计算应力场内部应力,代替传统的切力差法,使误差大为减少。实验结果表明,原来集中在孔壁的应力峰值向岩体内转移,达到了卸去孔壁集中载荷的目的,从而证实了用巷道自支撑岩石环代替传统的巷道支撑方法的可行性。
In this paper, the full-field stress analysis of the model of the rock mass supporting roadway with photoelastic analysis was carried out. Several forms of self-supporting rock rings were compared with round holes, six slots and secondary unloading slots. The internal stress of stress field is calculated directly by the photoelastic information by using the boundary element method, which can greatly reduce the error instead of the traditional shear force difference method. The experimental results show that the stress peak concentrated in the hole wall is transferred to the rock mass, which achieves the purpose of concentrating the load on the hole wall. Thus, the feasibility of using the self-supporting rock ring instead of the traditional tunnel support method is proved.