The Nottingham railway test facility, UK
The Nottingham railway test facility, UK
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DOI：
10.1680/tran.2007.160.2.59
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发表时间：
2007-05-01
影响因子：
0.8
通讯作者：
McDowell, G. R.
中科院分区：
文献类型：
--
作者：
Brown, S. F.;Brodrick, B. V.;McDowell, G. R.
介绍了一种新型的大型铁路道床试验设备。该设备由诺丁汉大学的研究小组设计和开发，最初用于两个与铁路道碴性能有关的项目。一个涉及应用土工格栅加固，以减少在反复车辆荷载下的沉降率，另一个是关于在加载和卸载下的道碴降解。该设施允许使用在实验室测试坑中构建的加载系统直接向轨枕施加高达94 kN的循环载荷。涉及三个轨枕，并通过伺服控制的液压致动器施加载荷，其输入相位模拟移动的车轮。可以将一个排料台连接到装载架上，以执行正常的维护操作。使用仪器测量永久轨道沉降和中央轨枕的瞬时挠度。土压力传感器可以安装在路基中，以监测瞬态应力。采用设施确定颗粒降解程度并控制路基地下水位。描述了设备的设计和性能，以及早期实验的一些典型结果。
A major new full-scale laboratory test facility for railway trackbeds is described. The equipment was designed and developed by the research team at the University of Nottingham, and has been used initially for two projects concerned with the performance of railway ballast. One dealt with the application of geogrid reinforcement to reduce the rate of settlement under repeated vehicle loading, and the other was concerned with ballast degradation both under loading and tamping. The facility allows application of cyclic loads of up to 94 kN directly to the sleepers using a loading system constructed in a laboratory test pit. Three sleepers are involved, and loads are applied by servo-controlled hydraulic actuators with their inputs phased to simulate a moving wheel. A tamping bank can be attached to the loading frame to perform the normal maintenance operation. Instrumentation is used to measure the permanent track settlement and the transient deflection of the central sleeper. Earth pressure cells can be installed in the subgrade to monitor transient stresses. Facilities are incorporated to determine the degree of particle degradation and to control the subgrade water table level. The design and performance of the equipment are described, together with some typical results from early experiments.