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The Qinghai–Tibet Railway (QTR) has been operating since 2006. It crosses continuous permafrost regions in the Qinghai–Tibet Plateau. Half of these regions are characterized by high ground temperature and ice content, and slight changes in the permafrost may cause embankment damage. In this study, the deformed embankment data of the QTR collected f...
A key issue in ensuring the stability of transportation infrastructure in permafrost regions of the Qinghai–Tibet Plateau (QTP) is to prevent the degradation of the underlying permafrost. Therefore, several cooling methods (such as sun sheds, duct-ventilated embankment, thermosyphon, crushed-rock embankment, and dry bridge) have been developed to s...
The embankment–bridge transition section (EBTS) is one of the zones where railway diseases occur frequently in permafrost regions. Disease risk assessment of EBTSs can provide guidance for maintenance. In this study, considering the engineering geological conditions, climate characteristics, and embankment structure types along the Qinghai–Tibet Ra...
在高温、高含冰量多年冻土区，普通路基受多年冻土退化的影响而产生显著的沉降变形，需要对它们增设块石护坡、热棒等冷却措施进行补强以提升路基的热、力学稳定性。为评价不同类型措施的补强效果以及路基补强后的力学稳定性，本文基于青藏铁路多年冻土区沿线6个经过补强的监测断面，通过分析历史变形数据评价了块石护坡–热棒复合措施及单一块石护坡措施的补强效果，然后利用Verhulst模型和指数曲线法演化分析其中3个变形较大的断面的沉降过程，以评价其长期力学稳定性。结果显示：普通路基在增设块石护坡-热棒复合措施或单一块石护坡措施之后，变形速率会有效减缓，而复合措施补强效率更快，效果更显著。在存在含土冰层的多年冻土区，采用复合措施进行补强可以显著提升路基的力学稳定性，而单一块石护坡措施可以一定程度上减缓路基变形速率，...
The Qinghai-Tibet Railway has been operating safely for 16 years in the permafrost zone and the railroad subgrade is generally stable by adopting the cooling roadbed techniques. However, settlement caused by the degradation of subgrade permafrost in the embankment-bridge transition sections (EBTS) is one of the most representative and severe distre...
Direct shear test is one of the common method to study the parameters of shear strength and shear strength of soil. However, the current standard of geotechnical test method does not consider the calculation error caused by the change of shear area during shear process. In this paper, the direct shear test corrected calculation model considering ef...
