Complex crack simulation test device, test method and crack wall surface preparation method

The invention provides a complex crack simulation test device, a test method and a crack wall surface preparation method.The test device comprises a stirring and conveying unit, a crack unit, a data acquisition unit and a control unit, the stirring and conveying unit comprises a stirring tank and a conveying pump, the conveying pump is communicated with the stirring tank, and the stirring tank is communicated with the crack unit; a proppant can be mixed and stirred by the stirring tank and is pumped into the crack unit by the conveying pump along the pipeline for a settlement migration test; the data acquisition unit is connected with the control unit and can measure flow and pressure parameters in a pipeline and monitor migration and laying conditions of the propping agent in the crack unit; and the control unit can receive data acquired by the data acquisition unit and control the test device. The simulated crack is close to a real crack surface, migration and distribution of the propping agent under differ