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随着甘肃省高速公路运营时间的增加,黄土地区隧道出现地表变形、衬砌变形破坏、隧道路面开裂等病害,洞顶的大面积灌溉和降雨是诱发隧道病害的主要原因之一。以往学者探讨了水在非饱和黄土中的渗透规律,并对黄土饱和或非饱和状态变形和强度规律进行了研究,但并未考虑在灌溉或降雨条件下水土的共同作用,无法描述黄土湿陷和增湿过程变形特性。本文在黄土结构性参数的基础上,总结了黄土结构性参数随含水率的增加而减小的规律,解释了渗透作用对黄土结构性破坏的机理。同时,结合黄土的二元地质结构,对长期灌溉和降雨过程隧道渗流场进行模拟,探讨了地表灌溉引发黄土隧道病害的渗流分布,探讨了灌溉引发黄土隧道病害的机理。
With the increase of highway operating time in Gansu Province, tunnels in the loess area have been subjected to surface deformation, lining deformation and cracking, and pavement cracking of tunnels. Large-area irrigation and rainfall at the top of the tunnel are one of the main causes of tunnel disease. In the past, scholars studied the law of water infiltration in unsaturated loess and studied the law of deformation and strength of saturated or unsaturated loess, but did not consider the synergistic effect of soil and water under irrigation or rainfall, And humidification process deformation characteristics. Based on the structural parameters of loess, this paper summarizes the law that the structural parameters of loess decrease with the increase of water cut, and explains the mechanism of the structural damage of loess through infiltration. At the same time, combined with the binary geological structure of loess, the seepage field of the tunnel in long-term irrigation and rainfall process was simulated. The seepage distribution of the disease caused by surface irrigation was discussed, and the mechanism of irrigation induced loess tunnel disease was also discussed.