Advances in Transportation Geotechnics IV - Proceedings of the 4th International Conference on Transportation Geotechnics Volume 2
Advances in Transportation Geotechnics IV - Proceedings of the 4th International Conference on Transportation Geotechnics Volume 2
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交通岩土工程进展 IV - 第四届交通岩土工程国际会议论文集第 2 卷
DOI：
10.1007/978-3-030-77234-5_78
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Woodward P
中科院分区：
文献类型：
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作者：
Woodward P
高速铁路的发展在世界范围内以非常快的速度发展。例如，在英国，HS 2线第一阶段（225公里）的建设现已开始，最高运营速度为360公里/小时。在本文中，性能的土工合成材料加筋土挡土墙（GRS-RW）的有碴轨道和混凝土板轨道使用全尺寸的实验室测试和土工离心模型。在全尺寸测试中，使用了赫瑞瓦特大学的地质路面和铁路加速疲劳测试（GRAFT II）设施。它使用六个独立的液压致动器在三个全尺寸的枕木上运行，以模拟移动列车的通过。测试的GRS-RW结构由压实良好的路基和根据HS 2标准设计的防冻层组成。结果记录在挠度，加速度，总沉降和瞬态应力在不同位置的结构模型。虽然全尺寸GRAFT II试验阐明了轨道和墙的行为，但为了研究地基土如何与结构相互作用，邓迪大学在土工离心机中进行了一系列小规模试验。通过建立GRS-RW和地基的小比例物理模型，并通过增加重力，离心机被用来模拟大的诱导应力。还监测了墙和地基的短期和长期变形。全尺寸和离心模型之间的比较。
The development of high-speed railways is progressing at a very rapid pace worldwide. For example, in the UK, the construction of Phase 1 (225 km) of the HS2 line has now begun, and it will have a maximum operational speed of 360 km/h. In this paper, the performance of a geosynthetic-reinforced soil retaining wall (GRS-RW) is presented for both ballasted track and concrete slab track using full-scale laboratory testing and geotechnical centrifuge modelling. In the full-scale testing, the geo-pavement and railways accelerated fatigue testing (GRAFT II) facility at Heriot-Watt University is used. It operates using six independent hydraulic actuators over three full-size sleepers to simulate the passage of a moving train. The tested GRS-RW structures consist of well-compacted subgrade and a frost protection layer designed to HS2 standards. Results are recorded in terms of deflections, accelerations, total settlement and transient stresses at various locations of the structure model. Whilst the full-scale GRAFT II testing elucidates behaviour of the track and wall, in order to study how the foundation subsoil may interact with the structure, a series of small-scale experiments were carried out in the geotechnical centrifuge by the University of Dundee. By creating small-scale physical models of the GRS-RW and foundation and by increasing gravity, the centrifuge was used to simulate the large induced stresses. Short- and long-term deformations of the wall and foundation were also monitored. Comparisons between the full-scale and centrifuge modelling are presented.