Liu Jun, Lu Peng, Zhang Luwei
School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China.
State key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo, Henan 454000, China.
ACS Omega. 2022 Sep 14;7(38):34296-34308. doi: 10.1021/acsomega.2c03811. eCollection 2022 Sep 27.
Owing to differences in deformation characteristics of roadways with different section shapes and depths, it is difficult to determine the support form and grouting depth of a roadway, which can cause serious deformation to the roadway. To address the challenges in determining the shape and grouting depth of a roadway section when the mine depth is known, the loose zone range of the roadway was tested using the acoustic method, and the loose zone evolution law under different conditions was performed by numerical simulations. The research results revealed that when the ratio of the maximum principal stress to the minimum principal stress is η > 3, the distribution of the rock loosening zone under different cross-sectional shapes was roughly "butterfly-shaped", and the "smoother" the cross section in the design of the roadway, the smaller the range of the rock loosening zone. With the increase of burial depth, the rock loosening zone and sealing depth also increase; the rock loosening zone and burial depth have a power function relationship the rock loosening zone range = ·burial depth ; the sealing depth and burial depth have a linear relationship = + .
由于不同断面形状和深度的巷道变形特性存在差异，巷道支护形式和注浆深度难以确定，可能导致巷道严重变形。为解决已知矿井深度时巷道断面形状和注浆深度确定的难题，采用声波法测试了巷道松动圈范围，并通过数值模拟研究了不同条件下的松动圈演化规律。研究结果表明，当最大主应力与最小主应力之比η>3时，不同断面形状下岩石松动圈分布大致呈“蝶形”，巷道设计断面越“光滑”，岩石松动圈范围越小。随着埋深增加，岩石松动圈和封孔深度也增大；岩石松动圈与埋深呈幂函数关系（岩石松动圈范围=·埋深）；封孔深度与埋深呈线性关系（=+）。
