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Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method

A direct shear test instrument, portable technology, applied in the field of direct shear test instruments, can solve the problems that the original sample is easily disturbed and cannot fully reflect the actual state of the soil on site, and achieve the effect of small disturbance, simple structure and convenient operation

Inactive Publication Date: 2008-01-16
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The undisturbed samples obtained in this way are easily disturbed and cannot fully reflect the actual state of the soil on site

Method used

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  • Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method
  • Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method
  • Portable on-spot and indoor dual-purpose direct-cutting experiment instrument and its sampling method

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Experimental program
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Embodiment Construction

[0030] The present invention will be further described in conjunction with the accompanying drawings.

[0031] As shown in Fig. 1 to Fig. 5, the portable on-site and indoor dual-purpose direct shear tester of the present invention mainly comprises sampling equipment (shearing frame (2) and rigid frame (3)), horizontal tensile shearing system (chain (12) ), hand wheel (16), tension sensor (13), etc.), mobile vertical loading system (roller system (30), beam pillar (18), beam (23), pillar (29), force transmission plate (9 ), force transmission column (10), lever (24), etc.) and box frame (7), rigid frame base (4) and displacement measuring equipment (vertical displacement meter (5), horizontal displacement meter (6)). Put the sample taken or the sample prepared in the room into the rigid frame base (4) on site, apply a certain vertical load through the mobile vertical loading system installed on the box frame (7), shake the hand The wheel (16) stretches the shearing frame (2) b...

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Abstract

A direct shear tester for both portable field test and indoor test and a sampling and testing method are provided. The tester comprises a sampling device, a portable vertical load system and a horizontal shear system. The testing method comprises burying a rigid frame together with a cruciform shear frame in the soil of a place to be test, digging out the whole soil containing the rigid frame and the cruciform shear frame to obtain an integrated sample with less interference, placing and fixing the integrated sample in a rigid frame base on a box-shaped frame, applying a vertical force by using the portable vertical load system on the box-shaped frame, and measuring the strength of the sample by using the shear frame. During the test process, the volume change of the sample in the vertical direction is not limited. The tester has simple structure, easy operation and good portability. The testing method employs flexible tension shear mode instead of the rigid top-bunt shear mode, overcomes the friction and sampling problems, and avoids the vertical pressure offset during the test process by using the portable vertical loading system, thereby increasing the test accuracy.

Description

1. Technical field [0001] The invention relates to a direct shear test instrument for soil strength testing and a sampling test method for the direct shear test. In particular, the instrument can conveniently and quickly test the strength parameters of natural soil slopes, fill soil slopes, and various foundation surfaces on the spot. 2. Background technology [0002] Direct shear test instruments are divided into indoor test direct shear instruments and field test direct shear instruments. The conventional indoor direct shear tester has two shear boxes, upper and lower. After the sample is placed in the shear box, a certain vertical pressure is applied on the top of the sample to push the shear box, so that the sample is sheared until it is destroyed, thereby Get the strength parameters of the soil. Since the sample is sheared by pushing the shear box, there must be a rigid connection between the shear box and the measuring ring. During the shearing process, if the volum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N1/04E02D1/00E02D1/04
Inventor 刘斯宏臧德记
Owner HOHAI UNIV
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