The upper boundary of the model is phreatic surface, the bottom boundary is the base of the Quaternary.
模型的上边界为潜水自由表面，下边界为第四系底界
Dynamic Monitoring and Analysis of Phreatic Water Surface in Phase Two Underground Drainage Project of Washan Pit
凹山采场井下二期排水潜水位动态监测与分析
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