高速公路边坡植草护坡的根固效应研究

Research on reinforcement mechanisms of expressway side slope protection with greensward

利用草根土室内直剪试验数据,对植草草种、含水率、植草坡度等主要因素采用正交试验方法,分析植草土体的抗剪强度指标的敏感性,得到土质边坡植草护坡的一些初步规律,结果表明:高速公路植草护坡的根固效应影响因素的敏感性顺序为草种>植草>坡度>含水率,相同条件下,草种抗剪强度序列为百喜草>结缕草>狗牙根>假俭草。试验结果可为国内高速公路边坡防护的植草护坡加固设计和施工提供一定的理论依据。

By using the indoor direct shear test data of turf soil,the orthogonal design and test were conclucted with the main factors such as grass species,water content and slope of artificial grassland,the sensitivity of shear strength of the greensward was analyzed,thus obtaining some primary laws of planting grass on the soil side slope to protect the slope from landslide.The results show that the effect factors of planting grass,protecting slope,affecting the side slope reinforcement ranked by magnitude as follows grass speciesslope of grasslandsoil water content.Under same conditions,the shear strength values of the grasses that were planted on the side slope sequenced in magnitucle order： Paspalum natatu Zoysia japonicaCynodon dactylonEremochloa ophiuroides.The findings provide a theoretical basis for side sloe reinforcement of China expressway.