Static and Cyclic Triaxial Testing of Ballast and Subballast
Static and Cyclic Triaxial Testing of Ballast and Subballast
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DOI：
10.1061/(asce)1090-0241(2005)131:6(771
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发表时间：
2005-06
影响因子：
3.9
通讯作者：
A. Suiker;E. Selig;R. Frenkel
中科院分区：
文献类型：
--
作者：
A. Suiker;E. Selig;R. Frenkel
本文讨论了道碴材料和道碴材料的三轴试验，这两种材料是通常用于铁路轨道基础结构施工的无粘性粒状材料。进行了静力和循环三轴试验。循环三轴试验模拟了这些铁路下部结构材料在大量列车车轮通过时的行为。静力试验的目的是先验地确定可应用于循环试验的最大应力水平，并评估在循环加载过程中产生的强度和刚度增加。为了准确监测静力和循环试验过程中的周向位移，研制了一种新型的测量装置。对道碴和次道碴材料的试验装置、试验程序和试验结果进行了处理。结果表明，在循环荷载作用下，即使施加的应力水平接近材料的静态破坏强度，散体材料也表现出很强的致密性。这种压实行为通常会导致材料强度和硬度的(显著)增加。
This paper discusses the triaxial testing of a ballast material and a subballast material, which are noncohesive, granular materials typically used for construction of a railway track substructure. Both static and cyclic triaxial tests were conducted. The cyclic triaxial tests simulated the behavior of these railway substructure materials under a large number of passing train wheels. The purpose of the static tests was to a priori identify the maximum stress level that could be applied in the cyclic tests, and to assess the strength and stiffness increase produced during the cyclic loading process. In order to accurately monitor the circumferential displacement during the static and cyclic tests, a new measuring device was developed. The experimental setup, the test procedure, and the test results are treated for the ballast and subballast materials. It is found that under cyclic loading the granular materials reveal a strong tendency to compact, even if the applied stress level is close to the static failure strength of the material. This compaction behavior generally causes a (significant) increase of the material strength and stiffness.