In order to address the problem of the influence of multi-field coupling in high-ground stress areas on the rupture range of deep-seated surrounding rocks,a mechanical analysis model of the plastic zone of surrounding rocks under multi-field coupling is established based on the double-shear unified strength theory,and a formula for calculating the radius of the plastic zone of surrounding rocks in deeply buried tunnels under the action of heat-force coupling is proposed.On this basis,the rupture zone radius calculation formula for the rupture of surrounding rocks in deeply buried tunnels under the action of heat-force coupling is further proposed.Combined with the analysis of engineering examples,it can be seen that,under the action of heat-force coupling,the error of the fracture radius of the surrounding rock zoning calculated based on the double-shear unified strength theory is less than 8.9％,which proves the reasonableness and feasibility of the calculation method proposed in this paper.The research results provide a theoretical basis for the analysis of the stability of the surrounding rock under the influence of high ground stress and high ground temperature and also provide a new method and means to quantitatively describe the phenomenon of zonal rupture.
关键词
热-力耦合/分区破裂/深埋隧道/双剪统一强度理论
Key words
thermal-force coupling/zoning fracture/deep buried tunnel/unified strength theory of double shear
维普
万方数据