几种典型渠道断面的实用经济性对比分析

A Review of Several Typical Channels in Practical Economy Sections

为了方便工程中对不同渠道断面的选用,解决水力最佳断面不便于施工、经济性较差的问题,对典型渠道断面的相关研究进行总结和分析,结合实例对比了几种渠道断面的优缺点和适用范围。结果表明曲线形渠道断面在水力性能和抗冻胀性能上总体优于折线形渠道断面,其中抛物线形渠道实用经济断面在同等条件下断面面积最小为12.46 m^(2),最大设计流速为2.09 m/s,设计流速U形和抛物线形接近,二者性能较好,但施工难度相对较高。实际工程中,要做好技术投入和经济投入的平衡,需根据具体的工程规模、水文地质情况及施工条件选择合适的断面型式。

To solve the problem that the optimal hydraulic section is not convenient for construction and the economy is poor, and facilitate the selection of different channel sections in the project. The related research of typical channel section was summarized and analyzed. The advantages and disadvantages and application scope of several channel sections were compared with examples. The conclusions are as follows. Curved channels are generally superior to linear channels in hydraulic performance and frost heave resistance. Case checking results show that, the minimum area of practical economic section of parabolic channel under the same conditions is 12.46 m^(2), the maximum design flow velocity among the three is 2.09 m/s, which is very Good in terms of its performance, but the construction is more difficult. Therefore, in practical engineering, it is necessary to select the appropriate section type according to the specific project scale, hydro geological conditions and construction conditions in order to balance the technical investment and economic investment.