麦冬草根系对边坡稳定性的影响分析

Effect of Ophiopogon Japonicus Root System on Slope Stability

麦冬草作为一种优良的护坡植物,前人对此研究较少,研究麦冬草在不同龄期的根系固土能力及在坡率不同时对边坡稳定性的影响可为工程护坡及绿化提供参考。选取不同龄期的麦冬草根系进行直剪实验探究对土体抗剪强度的影响,及用有限元软件建立边坡模型模拟麦冬草根系在不同坡率情况下对边坡稳定性影响。得出麦冬草根系随龄期的增长,含根土体抗剪强度会逐步提高,土体粘聚力提高较明显,对摩擦角影响不大;在不同坡率情况下,当坡率陡于1∶1.75时,加入麦冬草根系后边坡的安全系数均大于裸土边坡,坡率为1∶0.5时安全系数提高了0.006,相比其他坡率提高最为明显,但随着坡率由陡变缓,坡率达到1∶1.75或更缓时,加入麦冬草根系后安全系数基本无提高。

Ophiopogon japonicus is an excellent slope protection plant,which has been rarely studied by predecessors.Studying the soil fixation ability of Ophiopogon japonicus roots at different ages and its impact on slope stability at different slope rates can provide reference for slope protection and greening.The root system of Ophiopogon japonicus of different ages was selected for direct shear test to explore the impact on soil shear strength,and the slope model was established with finite element software to simulate the impact of Ophiopogon japonicus root system on slope stability under different slope rates.The results showed that the shear strength of the soil containing roots increased gradually with the increase of the age of Ophiopogon japonicus root system,and the cohesion of the soil increased significantly,with little effect on the friction angle;Under different slope rates,when the slope rate is steeper than 1∶1.75,the safety factor of the slope after adding Ophiopogon japonicus root system is greater than that of the bare soil slope.When the slope rate is 1∶0.5,the safety factor is increased by 0.006,which is the most obvious improvement compared with other slope rates.However,as the slope rate changes from steep to gentle,when the slope rate reaches 1∶1.75 or slower,the safety factor after adding Ophiopogon japonicus root system is basically not improved.