Waterproof viscoelastic boundary constrained underwater multipoint earthquake input shear box

Abstract

The invention discloses a waterproof viscoelastic boundary constrained underwater multipoint earthquake input shear box, which adopts an inner-outer double-layer combined and multi-section connecting structure, a damper is arranged between the inner-layer structure and the outer-layer structure, a spring I is sleeved outside the damper, and the outer end of the damper is connected with a sliding block; the horizontal sliding groove of the outer side plate and the limiting sliding groove of the outer end plate is matched with the sliding block of the corresponding damper; a flexible waterproof film I is adopted to seal the space between the inner layer and the outer layer of each box section to form a waterproof interlayer, a water inlet device is arranged at the bottom of the waterproof interlayer and provided with a fixed cylinder body, a piston is assembled in the cylinder body, a water outlet pipe is arranged at the joint of a water inlet cavity and a water return cavity, a water return pipe is arranged on the water return cavity, a check valve is arranged on the water return pipe, and a return spring is connected between the piston and the end cover of the water return cavity. According to the invention, seismic waves input at each point can be ensured to be mutually propagated through a soil medium, errors caused by reflected waves are reduced, and interference of dynamic water damping in a test process is eliminated.

Description

technical field [0001] The invention belongs to the technical field of civil engineering and water conservancy engineering, in particular to a shear box for underwater multi-point seismic input with waterproof viscoelastic boundary constraints. Background technique [0002] Shaking table test is an important method to study the dynamic interaction between soil and structure under seismic load. Its test cost is low, the cycle is short, and it can reproduce the seismic process and various artificial seismic waves well, so it has been widely used. In the test, a soil box filled with soil is used to replace the actual semi-infinite foundation soil, so the soil box will produce boundary effects, which are mainly manifested in the soil box hindering the shear deformation of the soil and the reflection of the seismic wave by the box wall. These problems are often tested by layered shear soil boxes made of several steel frames, but how to set up artificial boundaries more reasonably...

AI Technical Summary

Problems solved by technology

At this time, if two or more independent shear boxes are simply used, the ground motion will not be able to propagate between each point, and it does not conform to the real situation.

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