Surface Subsidence Prediction Method for Coal Mines with Ultrathick and Hard Stratum

<div>Subsidence monitoring of surface and UTHS after recovery of the 207 working face. (a) Schematic diagram of UTHS subsidence monitoring drill hole. (b) UTHS subsidence monitoring equipment. (c) UTHS and surface subsidence curves.</div>

Advances in Civil Engineering

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Figure 4

Figure 4: Surface Subsidence Prediction Method for Coal Mines with Ultrathick and Hard Stratum 