Deep horizontal load testing instrument

A technology of horizontal load and tester, which can be used in instruments, using stable tension/pressure to test the strength of materials, geophysical measurements, etc. It can solve problems such as large soil disturbance deformation, large data distortion, and many operation links

Inactive Publication Date: 2009-12-02
SHANGHAI TUNNEL ENGINEERING RAILWAY TRANSPORTATION DESIGN INSTITUTE
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AI Technical Summary

Problems solved by technology

[0002] The horizontal load test method in the prior art can only be applied to the shallow soil layer, and only above the groundwater level, but for the foundation buried deep, and the groundwater level is buried shallower, pre-drilling or self-drilling can generally be used The disadvantage of the side pressure test method is that the side pressure deformation measurement method and principle cannot truly reflect the deformation characteristics of the structure
The flat shovel test method can also be used. The disadvantage is that the disturbance deformation of the soil layer is greater than the measurement deformation, and the data is difficult to truly reflect the characteristics of the soil layer, and the reliability is poor.
There is also the method of drilling sampling and indoor test measurement. The reliability of the data depends on the soil quality, operating level, pressure setting, etc., and many operating links are involved. The final data is distorted and the use value is not high. After drilling and sampling, the soil sample stress has been released, the original stress environment has changed, and the measured test data deviates greatly from the actual situation.

Method used

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Embodiment

[0020] This embodiment includes a load plate 6, a loading device, a test part, and a closed casing 14, a sealing ring 10 is arranged between the casing 14 and the load plate 6, and the loading device and the test part are located in the inner cavity of the closed casing 14 , the loading device and the load plate 6 are fixedly connected by bolts. The loading device adopts a compound oil cylinder 32 composed of two oil cylinders, each of which includes a piston 11, a primary piston shaft 12, and a secondary piston shaft 7, and the end of the secondary piston shaft 7 and the load plate 6 adopt Bolted connection. The primary piston shafts 12 of the two oil cylinders are located in the middle cylinder body 13 .

[0021] The bottom of the closed casing 14 is fixedly provided with a soil cutting device. The soil cutting device comprises a soil cutting frame housing 1, a soil cutting blade 2, and a pressing-in cutting barrel 16, wherein the soil-cutting frame housing 1 and the close...

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Abstract

The invention relates to measuring instruments, in particular to a deep horizontal load tester. The tester adopts hydraulic drive to pressurize in stages, the load plate moves horizontally, and the data acquisition system collects the deformation values ​​under various pressures in real time. The lateral deformation value of the soil layer under different pressure states is taken, and when the soil layer is basically in the original stress state, it truly reflects the stress characteristics of the soil layer under field conditions.

Description

technical field [0001] The invention relates to measuring instruments, in particular to a deep horizontal load tester. Background technique [0002] The horizontal load test method in the prior art can only be applied to the shallow soil layer, and only above the groundwater level, and for the foundation buried deep, and the groundwater level is buried shallow, generally the pre-drilling or self-drilling method can be used The disadvantage of the side pressure test method is that the side pressure deformation measurement method and principle cannot truly reflect the deformation characteristics of the structure. The flat shovel test method can also be used. The disadvantage is that the disturbance deformation of the soil layer is greater than the measurement deformation, and the data is difficult to truly reflect the characteristics of the soil layer, and the reliability is poor. There is also the method of using borehole sampling and laboratory test measurement. The reliabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01V9/00
Inventor 石长礼张家峰和再锋
Owner SHANGHAI TUNNEL ENGINEERING RAILWAY TRANSPORTATION DESIGN INSTITUTE
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