基于能量平衡的多年冻土区公路设计理论研究

青藏公路长期研究表明，青藏高原多年冻土公路工程空间效应敏感，主要表现为公路空间效应直接改变下伏冻土地基的天然能量平衡状态，继而引发一系列工程病害. 针对这一工程问题，提出多年冻土地区公路能量平衡设计理论，研究公路工程建设引发的多年冻土地基能量变化状态，平衡自然环境变化和工程建设等导致的外界“有害”能量导入与工程处置措施对冻土地基中“有害”能量导出之间相互关系，从空间和时间两个维度分析多年冻土地区公路工程的能量平衡过程. 据此，作为多年冻土公路工程的设计依据，将为青藏高原高速公路的科学设计提供理论支持.

Design theory of highway in permafrost regions based on energy balance

Disease investigation along the Qinghai-Tibet Highway shows that permafrost is sensitive to geometric effect of the roadbed (such as width, height, slope ratio and etc.). Change of geometric effect could directly modify the natural energy balance in underlying permafrost foundation and thus cause a series of engineering diseases. Based on this idea, an "energy-balance design theory" is proposed. In this theory, the energy change in permafrost foundation due to engineering construction is taken as research foundation. The guideline of this theory is to seek a balance between the "harmful" energy input caused by natural environment change and artificial engineering construction and the "harmful" energy output caused by cooling measures in highway. The energy balance process of highway engineering in permafrost regions is analyzed in dimensions of space and time, which will be taken as design basis for the highway engineering in permafrost regions. The energy-balance design theory would provide theoretical support for the scientific design of the Qinghai-Tibet Expressway.