多年冻土区路桥过渡段变形整治措施研究

针对青藏铁路K1297+055路桥过渡段多年冻土区路基沉降变形，通过现场调查、理论分析及室内试验，分析了路桥过渡段病害产生的成因，采用在桥台台背回填片石的技术措施，并对变形和地温进行监测。结果表明：实施整治措施后的最终沉降量为14.7～15.8 mm，达到规范要求，且地层多年冻土上限较措施前减小约1.5 m，有效提高了路基整体稳定性。

Study on Deformation Control Measures at Transition Section of Road & Bridge in Permafrost Regions

Aimming at the settlement deformation of the subgrade in permafrost regions in K1297+055 transition section of road and bridge of Qinghai—Tibet Railway, through field survey, theoretical analysis and laboratory tests, the disease causes of the road and bridge transitional section were analyzed; The technical measures of rubble filling at the back of abutment were used. And the deformation and ground temperature of the subgrade section were monitored. The results show that the final settlement after the treatment is 14.7~15.8 mm and meets the requirements in the specification, and the stratigraphic permafrost table is reduced by about 1.5 m, compared with that before the treatment, all of which effectively improves the overall stability of the subgrade.