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A sample preparation method and pressing device for raw soil-based materials

A technology of base material and raw soil, applied in the field of building structure and civil engineering, can solve the problems of large test impact, low efficiency, cumbersome and other problems, and achieve the effect of good density, simple production process and good overall deformation.

Active Publication Date: 2019-08-27
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional compaction test uses a cylindrical compaction barrel and a cylindrical gravity compaction hammer for layered compaction, but it is cumbersome to use, human factors have a greater impact on the test, and the efficiency is low

Method used

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  • A sample preparation method and pressing device for raw soil-based materials
  • A sample preparation method and pressing device for raw soil-based materials
  • A sample preparation method and pressing device for raw soil-based materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] See figure 1 , taking a 150mm×150mm×150mm steel mold as an example, the pressing device for raw soil-based materials includes a test bench 1. The test bench 1 is provided with four columns perpendicular to the plane in four directions, and the test bench 1 is sequentially along the The first platform 11 and the second platform 12 are arranged side by side in the horizontal direction, and the four columns pass through the first platform 11 and the second platform 12 and are respectively fixed by anchor members 13. The anchor members 13 are screwed and fixed by bolt members. On the platform 12, a jack 2, a mold 3 and a pressure column 5 are coaxially arranged vertically from bottom to top in sequence, and the top of the pressure column 5 is tightly pressed against the first platform 11. A retaining hoop 4 is coaxially arranged between the mold 3 and the pressure column 5, the top end of the retaining hoop 4 is sleeved outside the pressure column 5, the bottom end of the r...

Embodiment 2

[0039] Embodiment 2: the contrast of sample preparation method

[0040] Taking a cubic steel mold of 150mm×150mm×150mm as an example, the compressive strength of cubic raw soil-based material specimens prepared by three different manufacturing methods: traditional hammering method, press compaction method and jack compaction method Experimental analysis, study the size and appearance of the test piece after forming, the density of the test piece after forming, and the compressive strength of the test piece after 28 days. Observe the test failure form, the location of cracks, study the stress distribution state, and carry out statistical analysis and stability analysis on the data. Study the commonality and difference of the three production methods, and find out the more suitable production method of the cube specimen of raw soil material.

[0041] Traditional hammering method:

[0042] Put the cubic steel mold flat on a solid ground, install the casing, apply a thin layer o...

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Abstract

The invention discloses a sample preparation method and a compaction device for immature soil base materials. The method comprises the steps that the interior of a mold is coated with a lubricating oil layer, the immature soil base materials are put into the mold layer by layer, the immature soil base material layers in the mold are compacted through a jack every time one layer of immature soil base material is laid, and therefore a sample to be detected is obtained; the compaction speed of the jack is 0.5 mm / s, the compaction pressure of the jack is 18-19 K / N, and the compaction time of the jack is 3-5 min; the compaction device comprises a test bed, the test bed is sequentially provided with a first platform and a second platform in parallel in the horizontal direction from top to bottom, the second platform is coaxially provided with the jack, a gasket, the mold and a pressing column in sequence from bottom to top in the vertical direction, and the top end of the pressing column abuts against the first platform. Compared with a traditional hammer test, a press compaction test and a jack compaction test, the compressive strength of a test piece compacted by the jack is more stable than the compressive strength of a test piece compacted by the other two test methods, test piece overall deformation is good, and the test piece has good ductility when compacted.

Description

technical field [0001] The invention belongs to the field of building structures in the field of civil engineering, and specifically relates to a sample preparation method and a pressing device for raw soil-based materials. Background technique [0002] The compaction test is a method of hammering a soil sample to understand the compaction characteristics of the soil. This method is to use different compaction work (hammer weight × drop distance × hammering times) to hammer soil samples with different water contents, and measure the corresponding dry bulk density, so as to obtain the maximum dry bulk density and optimal water content, as Provide basis for design and construction of filling works. The traditional compaction test uses a cylindrical compaction bucket and a cylindrical gravity compaction hammer for layered compaction, but it is cumbersome to use, and human factors have a great influence on the test, and the efficiency is low. Contents of the invention [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/36G01N1/28
Inventor 王毅红仲继清万虹宇张坤刘奇佶刘芳丁思远孙艺嘉侍雪雷石丹刘瑞元徐荀吴琴容
Owner CHANGAN UNIV
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