Active and passive soil pressure damage simulation analyzer for soil body behind retaining structure

Abstract

The invention discloses an active and passive soil pressure damage simulation analyzer for a soil body behind a retaining structure. The analyzer adopts a square box body in appearance, a threaded rod penetrates through a fixed casing pipe for mounting a hand wheel, and a top bracing is rotated to transfer the axial displacement; an angle control ring is in bolted connection with a movable baffle, and is easy to replace; as the angles of holes of inner and outer rings are different, inserted pins are used for fixing, and the tilt angle of the baffle can be adjusted as per the pace of 6 degrees; to-be-tested soil body ad colored sand are spread layer by layer in the box body during the testing; the hand wheel is rotated clockwise or anticlockwise to enable filling behind the baffle to deform, and after the filling reaches a limit state, the soil layer slips or swells to generate active or passive damage; the assumption of the Coulomb soil pressure theory and the Rankine soil pressure theory can be met through changing the tilt angle of the baffle and the friction degree; the displacement of the baffle can be obtained through conversion of rotating turns of the hand wheel, and the earth pressure and distribution of the earth pressure can be collected through a stress sensor embedded on the baffle. Therefore, the device can be used for validating the two soil pressure theories and analyzing the theoretical reasonability and engineering suitability of the theories.

Description

technical field [0001] The invention relates to a test device, in particular to a soil active and passive earth pressure damage simulation analyzer behind a retaining structure. Background technique [0002] Earth pressure is an important load for section calculation and stability checking of retaining structures. Many scholars have studied the calculation theory and method of earth pressure. The calculation theory of Coulomb's earth pressure is established on the assumption that the sliding surface is a plane and the sliding body is a rigid body. The theory is that when the retaining wall is suddenly removed, the fill will slide along a plane. If the retaining wall moves slightly away from the fill or squeezes towards the fill, failure surfaces with different inclination angles will be generated between the back of the wall and the horizontal plane. When the shape and position of the failure surface are determined, the active or passive failure earth pressure is determine...

AI Technical Summary

Problems solved by technology

Therefore, the model cannot demonstrate the failure mode of the backfill of the retaining structure with a certain inclination angle.

[0007] (2) The movable baffle and the dynamic thread of the soil active and passive failure demonstration instrument are fixedly connected, and it is difficult to change the roughness of the side where the retaining wall contacts the soil during the test, so the influence of the friction of the retaining wall on the failure form cannot be studied

[0008] (3) The soil active and passive damage demonstration instrument cannot measure the earth pressure at different positions of the movable baffle, and does not consider the measurement of the displacement required for the movable baffle when the damage occurs, so it can only measure the active and passive damage. Do some simulation demonstrations in the form, can not conduct an in-depth analysis of the earth pressure failure theory

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