Method for acquiring wall back concentrated soil pressure and force arm of retaining structure wall

The invention relates to the technical field of rock-soil mass parameter testing, and discloses a method for acquiring concentrated soil pressure and force arm at the back of a retaining structure wall, which comprises the following steps: arranging a calibrated tactile pressure sensing cloth liner at the back of the retaining structure wall; acquiring the soil pressure measured by the tactile pressure sensing pad by using the pressure acquisition system, establishing a relationship between the soil pressure and a space coordinate, and performing curved surface fitting so as to obtain the soil pressure; acquiring concentrated soil pressure by utilizing an integral principle; and constructing a soil pressure action point of the concentrated soil pressure according to the centroid projection, establishing a corresponding relation between the soil pressure action point and the space coordinates, and obtaining a concentrated soil pressure force arm according to the corresponding relation. By means of the method,