论文部分内容阅读
为了确定青藏高原多年冻土地区新建道路设计时工程热影响的范围,以青藏公路为例,应用有限元与无限元耦合的数值计算方法,以土体温差ΔT为评价指标,分析了公路路基热影响的范围及变化规律。研究结果表明:温差ΔT在横向上表现出随横向距离增加而呈抛物线衰减的规律;在垂向深度上以冻土天然上限深度和人为上限深度为界,划分为天然冻土活动层、公路路基影响层以及下伏多年冻土层等3个主要区域;在天然冻土上限深度以上,温差ΔT随深度增加呈对数减小趋势,在天然冻土上限深度与人为上限深度之间,ΔT随深度增加而呈三次方增加,在冻土人为上限趋势深度以下,ΔT随深度增加而呈对数减小趋势。
In order to determine the thermal influence of the design of the new road in the permafrost region of the Qinghai-Tibet Plateau, taking the Qinghai-Tibet Highway as an example, the numerical calculation method of finite element coupled with the finite element method is adopted. Taking the soil temperature difference ΔT as the evaluation index, Impact of the scope and changing rules. The results show that: the temperature difference ΔT shows the law of parabola attenuation along with the horizontal distance increasing in the horizontal direction; the natural depth of the frozen soil and the artificial upper limit depth in the vertical depth are divided into the natural frozen soil active layer, the roadbed Affected layer and underlying permafrost. Above the upper limit of natural frozen soil, the temperature difference ΔT tends to decrease logarithmically with increasing depth. Between the upper limit of natural frozen soil and the upper limit of artificial depth, ΔT Depth increases and the third power increases. Under the human-induced upper limit trend depth, ΔT decreases logarithmically with increasing depth.