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TBT2487-2016

Chinese Standard: 'TBT2487-2016'
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TB/T 2487-2016
TB
NATIONAL RAILWAY INDUSTRY
STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 45.020
S 04
Replacing TB/T 2487-1994
Test Method for Dynamic Stress of Subgrade
路基动应力测试方法
ISSUED ON. AUGUST 16, 2016
IMPLEMENTED ON. FEBRUARY 16, 2017
Issued by. National Railway Administration of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Test Objectives ... 4
3 Test Principle and Test Points Arrangement ... 4
4 Test Equipment Requirements ... 5
5 Sensor Calibration and Burying ... 6
6 Arrangement of Test Results ... 7
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced TB/T 2487-1994 Test Method for Dynamic Stress of Subgrade
Bed; compared with TB/T 2487-1994, this Standard has the major technical changes
as follows.
--- Add the arranging principle of measurement points of non-ballasted-track
subgrade bed (see 3.2);
--- Add the basic requirements for collecting device (see 4.3).
This Standard was proposed by and under the jurisdiction of China Academy of
Railway Science – Standard and Metrology Research Institution.
Drafting organization of this Standard. Railway Engineering Research Institute of
China Academy of Railway Sciences.
Chief drafting staffs of this Standard. Wang Lijun, Zhang Qianli, Cai Degou, Ye
Yangsheng.
The historical edition replaced by this Standard is as follows.
--- TB/T 2487-1994.
Test Method for Dynamic Stress of Subgrade
1 Scope
This Standard specifies the subgrade dynamic stress test objectives, test principle and
test points burying, test equipment requirements, sensor calibration and burying,
arrangement of test results.
This Standard is applicable to the dynamic stress test of subgrade for newly-built and
existing railways.
2 Test Objectives
2.1 Learn the dynamic load level of subgrade, so that provide basic data for the
analysis and evaluation of the subgrade structure.
2.2 Analyze the change regularity of train load on different track types, states, and
subgrade bed stress filed with new subgrade bed structure.
2.3 Analyze the dynamic stress change regularity between subgrade and bridge,
tunnel, culvert, and the like transitional section with different structures.
2.4 Analyze the influence degree of subgrade bed disease on the subgrade bed
stress.
2.5 Verify that the subgrade bed structure is reasonable, so that provide basic data
for the optimized design parameters.
3 Test Principle and Test Points Arrangement
3.1 Convert the pressure into electrical signals through the pressure sensor
(hereinafter referred to as sensor); use data acquisition system to record and convert
the electrical signals into the pressure values.
3.2 According to the structures of track, subgrade and transitional section, select the
representative positions to arrange the test points.
a) For ballasted track, the cross-section shall select the following positions to
arrange test points as per requirements like under track, track center, sleeper
end, ballast curb, and the representative positions of subgrade bed; it is shown
in Figure 1; while the longitudinal-section shall be arranged the test points under
sleeper, between sleeper, and the representative positions of subgrade bed.
b) For non-ballasted track, the cross-section shall select the following positions to
arrange test points as per requirements like under track, track center, edge of
track plate (track bed), edge of base seat (supporting layer), and the
representative positions of the subgrade bed; it is shown in Figure 2; while the
longitudinal-section shall be arranged test points on the rail support, end of track
plate, middle of track plate, and the representative positions of subgrade bed.
c) Test points shall be arranged along the depth direction on the structural layer or
the middle of structural layer with different natures and different state of filler.
d) Select the representative positions of transitional section between subgrade and
bridge, tunnel, culvert.
e) When studying the stress state under the new track, the test points can be
confirmed briefly.
3.3 Bury the qualified sensor into the to-be-tested position; connect the sensor with
the acquisition system; use the acquisition system to directly record and display the
stress changes on such point when the train is passing by.
3.4 The record method of stress test shall be performed as per the releva......
Related standard:   TB/T 1122-2019  TB/T 1433.1-2019
   
 
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