论文同时对挖防挤土槽、预钻孔等措施作了具体分析和评价。
Meanwhile, it's presented in the paper that measures such as digging the groovy and pre-bording are analyzed and evaluated.
依据试验资料，通过对挖槽水流影响因素的因次分析，提出挖槽后轴线处的流速计算式。
Based on experimental data, through dimensional analysis of the influence factors of channelling flow, put forward the computative formula for velocities along axis after channelling.
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