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为研究青藏铁路高温高含冰量斜坡润湿地段路基稳定性,在青藏铁路K1139+940处开展地温、变形监测,分析路基地温、变形特征,建立温度、水分与变形耦合方程,预测斜坡水分运移对路基温度和变形的影响。结果表明:(1)斜坡路基阴阳坡效应明显,阳坡年平均温度比阴坡高2.5℃以上;(2)路基运营初期,左路肩下冻土上限下降、地表升温,而右路肩下上限抬升、温度降低,温度场的横向非对称分布导致明显的路基横向变形差异;(3)活动层水分渗流对路基阳坡下部温度和变形影响最明显,路基中心次之,阴坡最小,水分渗流加速了路基的升温和变形过程、加剧了路基温度场和变形的非对称分布;(4)斜坡路基运行50 a后,斜坡路基下部含土冰层全部融化、路面最大横向变形差异达到18 cm。对于含水量较高的斜坡地段,水分渗流对温度场和变形的影响不可忽略。
In order to study the stability of the roadbed in the high temperature and ice-rich slopes wetting section of Qinghai-Tibet Railway, ground temperature and deformation monitoring are carried out at Qinghai-Tibet Railway K1139 + 940, and the ground temperature and deformation characteristics are analyzed. Coupling equations of temperature, water and deformation are established to predict the water transport Impact on subgrade temperature and deformation. The results show that: (1) The effect of shady slopes is obvious, the average annual temperature of sunny slopes is 2.5 ℃ higher than that of shady slopes; (2) In the early period of subgrade operation, the upper limit of permafrost on the left shoulder drops and the surface temperature rises while the upper limit on the right shoulder rises (3) The water seepage flow in the active layer has the most obvious influence on the temperature and deformation of the subgrade sunny slope, followed by the subgrade center, the smallest shady slope, the accelerated water seepage (4) After 50 years of slope subgrade operation, the earth-ice layer in the lower part of slope subgrade melts completely, and the maximum lateral deformation difference of pavement reaches 18 cm. For slopes with high water content, the influence of water seepage on temperature field and deformation can not be neglected.