导出了线元切向量的变形方程以及拉伸轴在极射赤面投影图上位置变化计算公式。
The purely kinematical equation for the tangent vector of a line element is derived.
经过经济性分析，赤泥混合基层的工程造价比传统基层材料单位压实方低10~20元。
According to economic analysis, engineering cost of red mud road base per compressive m3 is CNY 10~20 Yuan lower than traditional road base materials.
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