| In western loess area highway construction scale mighty becoming, and because of the development of loess tunnel, the stability of roadbed, bridges and culverts, highway tunnel and sideslope is threaten seriously. Find effective swift prevention and cure measures imperative, this paper combines the scientific research projects, studies the mechanics mechanism of loess tunnel calamity in highway, it is very valuable in theory and practice. The main research contents are as follows:(1) Research on loess tunnel distribution and origin cause of formation: Synthesize forefather research results, summarize loess origin cause of formation, classification and distributing laws of loess tunnel systematically. All kinds of forming mode of loess tunnel are summarized and their forming mechanism and course are discussed profoundly.(2)Study on the mechanics mechanism of the calamity caused by the cave of the highway: Based on the investigation in detail along the line of the highway in Shan-Gan loess plateau, The distribution law, the classification and characteristic of hazard of highway cave are presented; the calamity mechanism of highway cave opposite side slope and road bed is discussed, especially the mechanism of collapsing of the hidden cave in road bed. Propose " the effect of hidden corrosion", etc. 10 kinds send to mechanism of collapsing. Based on the principle of limit balance, the formula of the critical treating thickness of hidden cave is put forward as follows: According to different stratum, different size and depth, the calculation of the critical thickness of the hidden cave of roadbed has been carried on. And sensitiveness factor causing the collapse of dark cave in roadbed is discussed, the reliable basis for studying the effective prevention and cure measure of the cave of the highway has been offered. |
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