Method for evaluating longitudinal deformation of proppant sand pile

The invention discloses a method for evaluating the longitudinal deformation of a proppant sand pile. The method mainly comprises the following steps that: a proppant is uniformly laid on a steel sheet, and the proppant is covered with another steel sheet which is same as the steel sheet; pistons are respectively arranged on the outer side surfaces of the two steel sheets, so that a test unit canbe formed; the test unit is arranged on a crack flow conductivity tester, 0.6 MPa pressure is applied to compact the propping agent sand pile, widths between the two steel sheets are measured at fourcorners of each steel sheet, and the average value of the widths is solved; a left displacement meter and a right displacement meter are installed, a pressure control system is used to increase closing pressure from 6.9 MPa to 69 MPa with an increase amplitude of 6.9 MPa through ten times, and the data of the left displacement meter and the right displacement meter are recorded when pressure application in each time stops