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研究目的:针对多年冻土区路堑病害的类型划分、形成原因和主控因素进行分析研究,提出现有路堑边坡典型病害的整治原则,为多年冻土区路堑边坡病害整治提供借鉴。研究结论:热融型边坡失稳是高含冰量多年冻土路堑边坡的一种典型病害,产生的原因是冻结层上水和坡面吸热导致下卧高含冰量冻土融化。治理的原则是在注重热学防护和地表挡排水的同时,加强对上侧坡体冻结层上水的疏导,排泄堑内道路基床积水。岩质边坡喷射混凝土防护层破损是低含冰量多年冻土路堑边坡较为典型的病害形式,也与冻结层上水向坡面的聚集有关。整治原则是加强边坡混凝土层下水分的排泄,拆除可能影响行车的破损混凝土层,换做锚杆框架等不阻挡坡面水分排泄的结构。原则上说,在多年冻土区,封闭坡面的工程措施是不可取的。
Research purposes: Based on the analysis of the types, forming causes and main controlling factors of the cutting diseases in the permafrost region, the principle of remediation of the typical cut of the existing cutting slope is put forward, which can provide references for the treatment of cutting slope in permafrost regions. Research conclusions: Thermal-melt-type slope instability is a typical disease of the frozen soil cut slope with high ice content. The reason is that thawed water on the frozen layer and endotherm on the slope lead to thawing of the frozen soil with high ice content. The principle of governance is to pay attention to thermal protection and surface drainage while at the same time, to strengthen the upper slope of the frozen layer of water on the drainage, draining the roadbed water within the reservoir. The damage of shotcrete protective layer on rock slope is a typical disease form of low cut ice containing permafrost. It is also related to the accumulation of water on the frozen layer. The principle of remediation is to strengthen the drainage of water under the concrete slope of the slope, remove the damaged concrete layer which may affect traffic, and replace the structure such as the anchor framework that does not block the drainage of water on the slope. In principle, in permafrost, engineering measures to close slopes are not advisable.