Shearing test device and test method of railway rockfill embankment

A test method and technology of a test device, which are applied in the direction of using a stable shear force to test the strength of materials, etc., can solve the problems of inaccurate methods for confirming the slip surface, lack of railway rock filling and embankment, and low measurement accuracy. The results are reliable, the safety factor is increased, and the effect of improving the measurement accuracy

Pending Publication Date: 2019-11-15
SHANGHAI INST OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] In order to solve the lack of shear test methods for railway rockfill embankments in the prior art, as well as existing shear test methods in other fields, the equipment is poor and the measurement accuracy is not high; Inaccurate method, the present invention provides a shear test device and test method for railway embankment filled with rocks

Method used

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  • Shearing test device and test method of railway rockfill embankment
  • Shearing test device and test method of railway rockfill embankment
  • Shearing test device and test method of railway rockfill embankment

Examples

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Effect test

Embodiment 1

[0073] A new type of railway rockfill embankment shear test device, including fixed steel box 1, hydraulic jack 5, ABS adjustable support 13, PTFE plate 11, inclination sensor 15, laser displacement sensor 6, electromagnetic pressure sensor 10, OTDR test Instrument 19, signal reading device 12.

[0074] Such as figure 1 , figure 2As shown, the fixed steel box 1 is a U-shaped steel frame, and the U-shaped steel frame includes one side plate and two ribs. The U-shaped steel frame is sequentially arranged from the inside to the outside: rear sleepers 2, rear steel plates 3, hydraulic jacks 5, Front steel plate 4 and front sleeper 7, ABS adjustable leveling support 13 is set below the hydraulic jack. The ABS adjustable leveling support 13 is made up of three parts of ABS fixed base 18, ABS thread lifting tube 17, nylon cable tie 16, and ABS thread lifting tube 17 is used for adjusting height. PTFE plates 11 are respectively arranged on the inner sides of the two long sides of ...

Embodiment 2

[0078] A kind of novel railway rockfill embankment shear test method of the present embodiment, uses the device of embodiment one, comprises the following steps:

[0079] The first step is to excavate a three-sided vertical cuboid soil to be tested at the predetermined depth of the railway embankment. The specific size of the cuboid is determined by the particle size of the test soil, and the height H is about 5 times the maximum test. Soil particle size, width B is about 1.8H, length L is the same as width W;

[0080] In the second step, a PTFE board is placed on the two sides of the excavated soil to be tested, and the soil material is backfilled and compacted. The contact surface between the PTFE board and the soil material is coated with a layer of lubricating oil;

[0081] The third step is to install and fix the U-shaped steel box, which is perpendicular to the embankment and the U-shaped opening is arranged towards the embankment; the U-shaped steel box includes a side ...

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Abstract

The invention discloses a shearing test device and test method of railway rockfill embankment. The shearing test device comprises a thrust device, a physical information detection system and a fixed steel box, wherein the thrust device comprises a pressure device, a sleeper plate, a steel plate and an adjustable horizontal rack, the sleeper plate is used for fixing the pressure device, the pressure device is arranged in the fixed steel box, PTFE plates are arranged at inner sides of two rib plates of the fixed steel box, the steel plate and the sleeper plate are arranged at one end of the pressure device, two ends of the sleeper plate are connected with the PTFE plates, and the shearing test device also comprises a pre-buried fiber. During working, experiment soil is sheared by gradual pressurization on the pressure device; and an information parameter of the pre-buried fiber is detected by an OTDR tester, a shearing surface shape is determined, the pattern of a shearing damage surfaceof the experiment soil is drawn, and the shearing strength index is calculated and obtained. The test device is simple to operate and can be used for detection of a construction site; and by the testmethod, the shearing damage surface pattern of the experiment soil can be rapidly and accurately acquired, and a rockfill material with more excellent stability is rapidly screened.

Description

technical field [0001] The invention relates to the technical field of railway engineering, in particular to a shear test device and a test method for railway rock-filled embankments. Background technique [0002] Embankment refers to a line building with a certain degree of density filled with soil or stone on the natural ground. Among them, the stone-filled embankment is an embankment filled with stone materials with a particle size greater than 40mm and not greater than 500mm. [0003] In recent years, with the increasing development of my country's economy, railway construction has developed rapidly. There are more and more cases of filling embankments with crushed stone materials, especially in the mountainous and hilly areas of our country, because most of the railway subgrade fillings come from stone excavation and tunnel abandonment, so stone filling embankments are widely used. And because the stone-filled embankment on the railway contains relatively high coarse-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24
CPCG01N3/24
Inventor 董文澎杨光房晓丰秦茂轩潘志群万衡刘振勇谭冬莲苏鹏
Owner SHANGHAI INST OF TECH
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