为了测得下峪口煤矿3#下煤层巷道松动圈厚度，以23305下回采巷道为例，利用UDEC数值模拟软件建立了巷道模型。对该模型进行煤岩力学特性参数赋值和确定边界条件，模拟得出巷道松动圈厚度。为了检验模拟结果，利用超声波围岩裂隙探测仪对巷道进行了现场测试，得出的松动圈厚度与数值模拟结果基本一致，说明数值模拟结果可为巷道松动圈测试提供参考。%In order to obtain the thickness of the loose circle of the roadway in No. 3 coal seam in Xiayukou Mine, a roadway model was established by taking the actual mining roadway of 23305 working face as the example and using UDEC numerical simulation software. The assignment of coal-rock mechanical parameters of the model was carried out, its boundary condition was determined and the thickness of the loose circle of the roadway was obtained by simulation. For verifying the simulated result, an ultrasonic rock crack detector was used for the site measurement of the roadway, the measured thickness of the loose circle of the roadway was basically consistent with that obtained by numerical simulation, this indicated that the results of numerical simulation can be used as a reference for the measurement of the loose circle of a roadway.
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