基于统一强度理论的巷道围岩松动圈计算方法

针对不同强度准则计算松动圈的适用性问题,基于围岩弹塑性理论,采用统一强度理论推导了巷道围岩松动圈理论计算公式。依托实际工程,采用Mohr-Coulomb准则、Hoek-Brown准则和统一强度理论对巷道围岩松动圈厚度进行理论计算。将理论计算结果和现场测试结果进行对比,发现基于Mohr-Coulomb准则计算松动圈厚度大于现场测试结果,基于Hoek-Brown准则计算松动圈厚度小于现场测试结果,同时二者的理论计算厚度与现场测试结果相差较大。而统一强度理论计算松动圈厚度和现场测试结果比较接近。因此,统一强度理论适用于巷道围岩松动圈理论计算。

Calculation Method of Roadway Surrounding Rock Loose Circle Based on Unified Strength Theory

According to the applicability of different strength criteria for calculating the loose circle, the theoretical formulas for calculating the loose circle of roadway surrounding rock are derived based on the elastic-plastic theory of surrounding rock by using the unified strength theory. Relying on the practical engineering, the thickness of surrounding rock loose circle of roadway is calculated theoretically by Mohr-Coulomb criterion, Hoek-Brown criterion and unified strength theory. And the theoretical calculation results are compared with the field test results. It is found that the thickness of loose circle calculated based on Mohr-Coulomb criterion is larger than the field test results, and the thickness of loose circle calculated based on Hoek-Brown criterion is smaller than the field test results. At the same time, the difference between the theoretical calculation thickness of the two methods and the field test result is large. However, the calculation of the thickness of the loose circle by the unified strength theory is close to the field test results. Therefore, the unified strength theory is applicable to the theoretical calculation of surrounding rock loose circle of roadway.