Experimental method for testing the performance evolution of cement-based materials for slab ballastless track structures

Abstract

The invention relates to a test method for testing the performance evolution of cement-based materials in a slab ballastless track structure, belonging to the technical field of concrete performance testing. The test device is composed of a simulated train dynamic load vibration system, a test piece mold box system, and a support platform system. The simulated train dynamic load vibration system includes a vibration platform, and two frequency conversion vibration motors and loading blocks on the vibration platform. The test piece module system consists of a hard plastic cuboid module with the cover removed, a stainless steel bottom plate and a geotextile. The supporting platform system is composed of pillars, springs, supporting platforms and ground bases. The stainless steel bottom plate is set on the supporting platform. The vibration platform and the frequency conversion vibration motor are connected to the bottom through the four-side pillars together with the loading block. the spring. The invention has a simple structure, can more realistically simulate the performance evolution of track structure materials under different vibration and impact frequencies under high-speed railway operating conditions, and is scientific and effective.

Description

technical field [0001] The invention belongs to the technical field of concrete performance testing, and relates to a test method for testing the performance evolution of a slab ballastless track structure cement-based material, in particular to a method for testing and evaluating the performance evolution of a slab ballastless track structure cement-based material under the coupling action of high-speed train dynamic load and water test equipment and methods. Background technique [0002] With the rapid development of my country's high-speed railway construction, the research on the properties of cement-based materials for high-speed railway slab ballastless track structures has become an important topic. see figure 1 The high-speed railway slab ballastless track structure is mainly composed of concrete support layer, filling layer, prefabricated track slab, fasteners and rails and other components. The filling layer is the key structural layer, which is located between t...

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Problems solved by technology

This kind of adverse effect will cause the gap between the layers of the track structure. The gap will not only cause changes in the geometric dimensions of the track and aggravate the dynamic impact between the wheels and rails, but also lead to changes in the dynamic characteristics and service performance of the entire track structure, and will also cause changes in the train load. Under repeated impact, the support layer and the track slab will repeatedly "slap" the filling layer, resulting in damage to the filling layer and affecting the normal operation of the high-speed railway [4] , What's more, it may lead to serious accidents, endangering the safety of life and property

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