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Shear Resistance of Rubber-ballast Composites in Simulated Water and Acid Soaked Conditions

机译：模拟水和酸浸泡条件下橡胶镇流复合材料的抗剪强度

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Ballast is one of the main structures for the railway tracks. It can resist the lateral movement under dynamic loading transferred by the passing trains with repeatedly. Under some circumstances, ballast can suffer degradation or breakdown due to the repeated loading and maintenance. Ballast is easily exposed to the weather because it is laid on the track. Acid rain affects the performance of the railway track near the industrial and urban area. As a result, it starts to foul and the small chips from ballast filled the void, as well as reduce the shear strength of ballast particles. This situation can contribute into the increasing of maintenance frequency and costing. This paper examines the potential of rubber inclusions in increasing the shear resistance of rubber-ballast composites in simulated water and acid soaked conditions with several configuration. This lab-based exploratory work is only static load simulation in conventional shear box setup measuring 60 mm × 60 mm. The aggregates size is 10 times smaller than actual size of ballast. In order to identify the shear resistance deterioration of rubber-aggregates mixture under poor drainage conditions by soaked a batch of aggregates in water and acid solution for 2 weeks to simulate accelerated weathering effects. The shear resistance did not rise dramatically with the rubber reinforcement. This susceptible shear strain plots indicate ductile behaviour on the aggregates-rubber composites. This is evident by the linear rise of shear stress with strain up to approximately 10% for the control samples (CS) until it reaches a constant value. Note that all the specimens including CS are in a loose state during the testing because there were no tamping been applied on the samples. Overall the circular patch (CP) specimen was the most favourable than the other configurations. Both mechanisms contributed to the reduced overall subsistence, accompanied by an increase in the shear resistance. The inclusion of rubber elements apparently prevented the dilation of the granular material when approaching the shear failure and the reducing the settlement.
机译：镇流器是铁路的主要结构之一。它可以抵抗经过的列车反复传递的动态载荷下的横向运动。在某些情况下，由于反复加载和维护，镇流器可能会退化或击穿。镇流器铺设在轨道上，因此很容易受到天气的影响。酸雨会影响工业和市区附近铁路的性能。结果，它开始结垢，并且来自压载物的小碎片填充了空隙，并降低了压载物颗粒的剪切强度。这种情况会导致维护频率和成本增加。本文研究了在几种配置的模拟水和酸浸泡条件下，橡胶夹杂物在增加橡胶-压载物复合材料的抗剪强度方面的潜力。这项基于实验室的探索性工作仅是在60 mm×60 mm的常规剪切箱设置中模拟静载荷。骨料的尺寸比镇流器的实际尺寸小10倍。为了确定橡胶-骨料混合物在排水不良的情况下的抗剪切力劣化，将一批骨料在水和酸溶液中浸泡2周以模拟加速的风化作用。橡胶增强材料的抗剪切强度没有显着提高。该敏感的剪切应变图表明了骨料-橡胶复合材料的延性行为。对于控制样品（CS），直到达到恒定值之前，剪切应力线性上升，应变高达大约10％，可以证明这一点。注意，在测试过程中，包括CS在内的所有样品都处于松弛状态，因为没有在样品上施加夯实。总体而言，圆形贴片（CP）标本比其他配置最为有利。两种机制都导致总体生存减少，同时剪切强度增加。当接近剪切破坏时，橡胶元素的加入显然防止了粒状材料的膨胀并减少了沉降。

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