The invention discloses a foundation base model test device capable of bidirectional loading. A force-bearing framework is a rectangular steel frame, a model slot is of a rectangular steel structure, is provided with an upper opening and is formed by welding of a box template, the force-bearing framework is sleeved at the periphery of the model slot, a horizontal actuator counterforce column is vertically erected on the left end part of the model slot, the left end of the horizontal actuator is connected with the horizontal actuator counterforce column, the right end of the horizontal actuator is connected with the top of a pile, the upper end of a vertical actuator is connected with a cross beam at the upper part of the force-bearing framework, the lower end of the vertical actuator is connected with the top of the pile through a vertical dowel steel, a row of drain valves are arranged at the lower part of the left side wall of the model slot, an inlet valve is arranged at the lower part of the right side wall of the model slot, and a water supply pipe of the inlet valve is connected with a constant-pressure water tank. Monitoring is systematic and comprehensive, embedding of monitoring instruments is relatively easy, and automatic and real-time monitoring on multiple physical quantities can be realized. The foundation base model test device disclosed by the invention can be used in conducting model tests like slope foundation, composite foundation and pile foundation.

Foundation base model test device capable of bidirectional loading

The invention discloses an indoor frozen soil model pile static force loading experimental device and method. The device comprises a workbench, a loading framework, a self-balance lever static force loading device, a refrigerating system, a pile soil model, a displacement measurement system and a strain testing system, wherein the workbench is arranged on a horizontal plane; the loading framework is vertically welded on the workbench; the self-balance lever static force loading device, the refrigerating system and the pile soil model are installed from the top of the outer side to the bottom of the inner side of the overloading framework in a matched mode from top to bottom sequentially; the displacement measurement system and the strain testing system are arranged on the external side wall of the loading framework; the displacement measurement system extends into the loading framework and is connected to the part between the refrigerating system and the pile soil model; the strain testing system extends into the pile soil model. The indoor frozen soil model pile static force loading experimental device and method can overcome defects of high cost, high maintenance expense, long time and the like in the prior art so as to achieve the advantages of low cost, low maintenance expense and short time.

Indoor frozen soil model pile static force loading experimental device and method

The invention relates to a test apparatus used for simulating the influence of three-axis loading and unloading on an engineering pile, which comprises a pressure chamber upper cover, a pressure chamber, a multistage model pile, a pressure chamber pedestal, a pressure chamber carriage, a pressure chamber pull bar, a pile end constraint spring, a soil sample, a confining pressure loading component, a vertical pressure loading component and a displacement measuring component; the confining pressure loading component comprises a latex film, a sealing ring and a confining pressure loading and unloading valve, the latex film is placed inside the pressure chamber, the upper end and the lower end of the latex film are tightly connected with the pressure chamber through the sealing ring, the confining pressure loading and unloading valve is arranged on the sidewall of the pressure chamber; the vertical pressure loading component comprises an enclosed vertical loading pressure capsule and a pressure capsule valve. Compared with the prior art, the invention has the advantages that three-axis loading and unloading is carried out on the soil sample for determining the influence of compressiondeformation and rebound deformation of the soil sample on the forced deformability performance of the model pile.

Test apparatus used for simulating influence of three-axis loading and unloading on engineering pile

The invention discloses a multifunctional combined testing device and testing method for soil mechanics. The device comprises a model groove, a retaining wall system, a slope fixing mechanism, a loading system and a visualization system, wherein the retaining wall system is used for simulating a mode that a rigid retaining wall deviates from or pushes a soil body to achieve change of soil pressure; the slope fixing mechanism is used for achieving change of a gradient of a soil slope; the loading system is used for applying a vertical load to a foundation; and the visualization system is used for recording the characteristics such as damage of the soil body in the testing process through cameras at four vertexes of an opening of the model groove and synchronously showing the characteristics. The relevant tests of the soil pressure of a retaining structure, the slope stability and the bearing capacity of the foundation can be carried out, so that teaching test courses in the soil mechanics are relatively well supplemented, and a basis is provided for technical personnel in the field for analyzing project cases with complicated working conditions.

Multifunctional combined testing device and testing method for soil mechanics

The invention discloses a pressing and pulling integrated experimental indoor pile model test device. The pressing and pulling integrated experimental indoor pile model test device comprises a model pile, an experimental box body, a loading device, a monitoring device and an auxiliary experimental device, wherein the model pile is positioned in the center of the experimental box body; the loading device comprises a lever and heavy weights, one end of the lever is connected to the box wall on one side of the experimental box body in a swinging manner, the application point of the lever is positioned above the model pile, the other end of the lever penetrates the box wall on the opposite side, and a suspender used for suspending the heavy weights is arranged at the tail end of the other end of the lever; the motoring device comprises a measuring system, a sensing system, a signal acquisition system and a signal processing system; and the acting force of the heavy weights acts on the model pile by the lever and/or a steel wire rope on the lever. The pressing and pulling integrated experimental indoor pile model test device has obvious beneficial effects, can be used for conveniently conducting experiments on various compressive piles and uplift piles, saves both manpower and material resources and improves the experimental efficiency.

Pressing and pulling integrated experimental indoor pile model test device

The utility model relates to a novel tester in a pile-soil function chamber to test mutual function of pile-soil in different working condition in the chamber by the mode of sleeve line balanced afterburning. The tester contains a cladding earth pressure loading device, a barrel body, a balanced loading system etc. A plurality of sleeve lines go through the side wall of the barrel body, the barrel bottom and the loading cover to form paired afterburning on pre-buried models; mutual function of pile-soil while suffering from vertical force and lateral force or the bending moment respectively or simultaneously under the cladding earth pressure can be tested in the chamber and pile-soil function under alternating loads can be also tested. The utility model is applicable to researching foundation bearing mechanism and testing various foundation bearing abilities.

Indoor experimental arrangement for pile-soil action

This invention relates to a new type of experiment apparatus in pile-soil operation chamber, which is to mock up and test the interaction of pile-soil under multiple conditions in the chamber It comprises upper cap-mud pressure load apparatus, barrel and balance load system, wherein, several set wires go through the side wall, bottom of barrel and pressure load cap to exert double pressure on the imbedded model peg, meanwhile to measure the pile-soil interaction under the alternating load This invention can be applied to study the foundation bearing principle and to test various bearing abilities ii

Shen Chen

Papers

Indoor experimental arrangement for pile-soil action

Pile-soil action indoor testing apparatus