Figure 8
Surface fracture, surface displacement curve, and soil strain curve. (a–e) The surface fracture of 1st–5th phase. (a-1, b-1, c-1, d-1, and e-1) The surface displacement curve of 1st–5th phase. (a-2, b-2, c-2, d-2, and e-2) The soil strain curve of 1st–5th phase. The preset fracture position is X-coordinate zero point of surface subsidence curve. The direction toward hanging wall is positive, and the direction of footwall is negative. The fiber is tensile, and the strain is positive. The fiber is compressed, and the strain is negative. There are two optical fibers in buried position at each stage, so there will be two strain regions in the Figure.
