Rapid Plate Load Test Method

A rapid test and plate load technology, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of low test efficiency and long test time, and achieve the goal of reducing test time, fast test speed and improving test efficiency. Effect

Active Publication Date: 2015-08-12
CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] K 30 and E v2 Long test time, low detection efficiency and construction waiting for detection

Method used

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Examples

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specific Embodiment

[0067] 1. Foundation coefficient K s Quick test method test operation steps, such as figure 1 Shown:

[0068] (1) The field test surface should be leveled, and the loose soil should be swept away with a brush. When on a slope, the test surface should be made level;

[0069] (2) Install the tester;

[0070] (3) Loading test:

[0071] ① Pre-loading, for bearing plates with diameters of 300mm, 400mm and 600mm, pre-load 0.04MPa, 0.03MPa and 0.02MPa respectively, maintain the load for 30s and unload it, and then wait for 30s before setting the reading of the settlement gauge to zero.

[0072] ②Loading: Apply loads of 0.30MPa, 0.23MPa and 0.15MPa to bearing plates with diameters of 300mm, 400mm and 600mm respectively. When it is 1% of the load, it can be considered that the sinking amount of the bearing plate under this load has reached stability), and the readings of the load intensity and sinking amount are read, such as figure 1 shown; then the load is removed.

[0073] (4...

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Abstract

The invention discloses a quick flat-plate load test method which comprises a foundation coefficient Ks quick test method and a secondary deformation modulus Ev2 quick test method, wherein the foundation coefficient Ks quick test method comprises the steps of employing primary loading to the maximum load and calculating the Ks value according to the load and the settling volume; the secondary deformation modulus Ev2 quick test method comprises the steps of employing primary loading to the maximum load, removing total loads after the settling volume is relatively stable, performing secondary loading to the required load, and calculating the Ev2 value according to the load and the settling volume. Only several minutes are required during the test, the test time is greatly shortened, and the detection efficiency is improved, so that the flat-plate load test is high in detection speed and accurate in detection result.

Description

technical field [0001] The invention relates to a technology for detecting the compaction quality of roadbeds, in particular to a fast plate load test method. Background technique [0002] "Code for Design of High-speed Railway" (TB10621-2009) stipulates that the standard mechanical index of high-speed railway ballasted track subgrade compaction adopts the foundation coefficient K 30 , Dynamic deformation modulus E vd , the subgrade compaction standard of ballastless track can adopt foundation coefficient K 30 or modulus of deformation E v2 (including E v2 / E v1 ), dynamic deformation modulus E vd index. [0003] In the prior art, the foundation coefficient K 30 and modulus of deformation E v2 The tests are all static plate load tests, in which static loads are applied step by step on a bearing plate with a diameter of 30cm, the settlement of the foundation under the loads of each level is observed, and the foundation coefficient K of the foundation is calculated acc...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01N3/08
Inventor肖金凤邢亮孙嘉良杨岳勤杨永强李树峰
OwnerCHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP