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不同配比深、浅根系植物对边坡抗冲、抗剪性能影响试验

, PP. 39-44

Keywords: 道路工程,公路边坡,现场试验,抗冲刷性能,抗剪特性,护坡植物配比

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Abstract:

为进一步完善高速公路植被护坡方案,开展不同配比深、浅根系植物对公路边坡抗冲刷、抗剪性能影响的试验研究。以我国南方某高速公路边坡为研究对象,采用百喜草和狗牙根进行现场试验研究和理论分析。研究结果表明深、浅根系的不同配比对边坡抗冲刷和抗剪性能影响显著。降雨初期,百喜草粗壮的深根系增加了雨水的下渗速度,降低了坡面径流量、产沙量和坡面流速;随着坡内水分饱和,各种护坡方案下边坡径流量差异逐渐减小,但由于百喜草对地表泥沙包裹能力不如狗牙根强,因此含百喜草较多的方案下产沙量反而增加;坡面水流流速与径流量,根系含量与黏聚力均呈正相关;只含百喜草根系的边坡土壤黏聚力随深度的变化最小,只含狗牙根根系的边坡土壤黏聚力随深度变化最大。考虑到强降雨条件下含根土壤的抗滑移能力,结合坡面土壤产沙试验结果,建议边坡护坡植物草种配比为0.6g/m2的狗牙根和8.7g/m2的百喜草。

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