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A Gravel Grading Design Method for High-speed Railway Foundation
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A technology of crushed stone grading and high-speed railway foundation, which is applied in the field of crushed stone grading design for high-speed railway foundation, and can solve problems such as poor skeleton and construction requirements.
Active Publication Date: 2016-03-16
SOUTHEAST UNIV
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Problems solved by technology
Some experiments have proved that the skeleton of the denser gradation may not be very good, such as the suspended dense gradation, this kind of gradation does not meet the construction requirements
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Embodiment 1
[0029] The gradation of coarse aggregate and fine aggregate is: coarse aggregate 74.1%, fine aggregate 25.9%.
[0030] Among them, the amount of crushed stones of each particle size in the coarse aggregate is: 20.0% of crushed stones with a particle size of 4.75; 16.0% of crushed stones with a particle size of 9.5; 12.4% of crushed stones with a particle size of 13.2; 15.4%; 21.4% of 19-grain crushed stone; 14.8% of 26.5-grain crushed stone.
[0031]Among them, the crushed stone content of each particle size in the fine aggregate is: 0.075 particle size is 4.4%, 0.15 particle size is 10.8%, 0.3 particle size is 24.0%, 0.6 particle size is 14.5%, 1.18 particle size is 19.7% %, 2.36 particle size is 26.6%.
[0032] The graded crushed stone has a CBR value of 75 and a maximum dry density of 2.16g / cm 3 .
Embodiment 2
[0034] The gradation of coarse aggregate and fine aggregate is: coarse aggregate 74.1%, fine aggregate 25.9%.
[0035] Among them, the amount of crushed stones of each particle size in the coarse aggregate is: 15.0% of crushed stones with a particle size of 4.75; 18.0% of crushed stones with a particle size of 9.5; 14.4% of crushed stones with a particle size of 13.2; 16.4%; 19-grain crushed stone 21.4%; 26.5-grain crushed stone 14.8%.
[0036] Among them, the crushed stone content of each particle size in the fine aggregate is: 0.075 particle size is 4.4%, 0.15 particle size is 10.8%, 0.3 particle size is 24.0%, 0.6 particle size is 14.5%, 1.18 particle size is 19.7% %, 2.36 particle size is 26.6%.
[0037] The graded crushed stone has a CBR value of 73 and a maximum dry density of 2.13g / cm 3 .
Embodiment 3
[0039] The gradation of coarse aggregate and fine aggregate is: coarse aggregate 71%, fine aggregate 29%.
[0040] Among them, the amount of crushed stones of each particle size in the coarse aggregate is: 15.0% of crushed stones with a particle size of 4.75; 18.0% of crushed stones with a particle size of 9.5; 14.4% of crushed stones with a particle size of 13.2; 16.4%; 19-grain crushed stone 21.4%; 26.5-grain crushed stone 14.8%.
[0041] Among them, the crushed stone content of each particle size in the fine aggregate is: 0.075 particle size is 4.4%, 0.15 particle size is 10.8%, 0.3 particle size is 24.0%, 0.6 particle size is 14.5%, 1.18 particle size is 19.7% %, 2.36 particle size is 26.6%.
[0042] The graded crushed stone has a CBR value of 76 and a maximum dry density of 2.08g / cm 3 .
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Abstract
The invention provides a method of a gravel grading design for a high-speed rail subgrade. The method comprises the following steps: respectively screening gravels in different particle diameters by virtue of sieve pores; determining the mixing amount of second-grade aggregates according to the change rule of a CBR value by taking the gravels with the particle diameter of 16 as first-grade aggregates and the gravels with the particle diameter of 19 as the second-grade aggregates; adding third-grade aggregates into the optimally-proportioned mixed aggregates of the first-grade aggregates and the second-grade aggregates by taking the gravels with the particle diameter of 26.5 as the third-grade aggregates, and determining the mixing amount of the third-grade aggregates by measuring the change rule of the CBR value; respectively determining the optimal mixing amount of fourth-grade gravel aggregates with the particle diameter of 13.2, fifth-grade gravel aggregates with the particle diameter of 9.5 and sixth-grade gravel aggregates with the particle diameter of 4.75 by adopting the same method; finally determining the mixing amount of the gravels with the different particle diameters in the coarse aggregates; determining the grading of fine aggregates according to a theoretical calculation method based on a K value; mixing the theoretically-calculated fine aggregates with the coarse aggregates, and carrying out a CBR test on the mixed aggregates so as to determine the grading of the coarse aggregates and the fine aggregates. The method can be used for efficiently, visually and accurately reflecting the basic performance of the graded gravels taken as the subgrade so as to provide a necessary guarantee for construction quality and engineering safety.
Description
technical field [0001] The invention relates to the field of gravel gradation design and construction of high-speed railway roadbed, and provides a method for gravel gradation design for high-speed railway foundation. Background technique [0002] With the continuous acceleration of my country's reform and development and the leapfrogging of economy and technology, my country's railway technology, especially high-speed rail technology, continues to develop rapidly, which embodies the progress of my country's railway transportation to achieve leapfrog development, and makes China's overall railway infrastructure level. History spans. High-speed railway subgrade is the basis for bearing track structure and train load, and is an important part of railway engineering. In addition to basic functions, it should also meet the requirements of impact load when trains run at high speed: have sufficient strength, stiffness and stability And durability, able to withstand various conditi...
Claims
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Application Information
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