Experimental and Numerical Investigation on Hydraulic Fracture Propagation Law of Composite Rock Materials considering the Disturbing Stress Effect

Figure 3

The preparation process of the test block containing bedding planes. (I) Putting down for casting. (II) Adding cement mortar and vibrating. (III) Start air drying. (IV) After air drying. (V) Start air drying the second bedding plane. (VI) The air drying of the second bedding plane is finished. (VII) Install the hole sealer. (VIII) The third layer is finished, and air drying was started. (IX) The test block is finished [49].