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青藏铁路的平均海拔在4000 m以上,自然条件恶劣,沿途穿越较多的高山、深谷和陡坡等地形复杂的区域,除修建较多的桥涵之外,挡土墙在路基工程中也占了较大比例,因此,挡土墙的质量问题直接关系着铁路运输的安全。对挡土墙进行快速、准确的无损检测,找出存在的安全隐患和病害并对其进行早期预防和及时治理,是确保铁路工程质量至关重要的问题。鉴于挡土墙厚度变化范围较大,采用地质雷达双频检测的方法,对青藏铁路格尔木至拉萨段的浆砌片石挡土墙进行了质量抽测和评价,并验证了该方法的有效性。
Qinghai-Tibet Railway has an average altitude of more than 4,000 m, with poor natural conditions and complicated terrain such as high mountains, deep valleys and steep slopes. Along with the construction of more bridges and culverts, the retaining walls also account for more in subgrade construction A large proportion, therefore, the quality of retaining wall is directly related to the safety of railway transport. The fast and accurate non-destructive testing of retaining walls, the identification of potential safety hazards and diseases, and the early prevention and timely treatment of retaining walls are issues of crucial importance in ensuring the quality of railway construction. In view of the wide variation range of the retaining wall, the method of dual-frequency detection with GPR was used to conduct quality sampling and evaluation on the mortar-masonry retaining wall from Golmud to Lhasa in the Qinghai-Tibet Railway. The validity of this method was also verified.