土工格室加固边坡稳定性参数分析

Analysis of Stability Parameters of Geocell Reinforced Slope

土工格室边坡防护是一种绿色、经济、高效的防护方式。针对土工格室加固边坡的稳定性问题,结合浅层稳定性和深层稳定性两方面综合评价土工格室加固效果。首先考虑土工格室、铆钉及植物根系的作用,重点围绕裸坡、仅铺设格室和格室植草三种工况开展研究,建立了降雨条件下土工格室加固边坡浅层失稳模型和深层数值模拟模型。进一步进行参数敏感性分析,全面研究了边坡坡度和坡长、土工格室尺寸和强度、植物根系密度等参数对浅层抗滑安全系数和深层稳定安全系数的影响。研究结果表明,仅铺设格室和格室植草分别能提高浅层抗滑安全系数1.07和1.33,效果十分显著,对深层稳定性提高效果相对不明显;各参数中,坡角、格室高度、格室焊距和植草密度对土工格室加固边坡稳定性有着重要影响,研究可为土工格室加固边坡优化设计提供参考。

The use of geocell on slope protection is a green,economic and efficient protection method.Aiming at the stability problem of geocell reinforced slope,the effect of geocell reinforcement was evaluated by combining the shallow layer stability and the deep layer stability.Three cases of the bare slope,laying only geocell and planting grass in geocell,were studied by considering the effects of geocell,rivets,and plant roots.The shallow instability model and deep numerical simulation model of geocell reinforced slope under rainfall conditions were established.The influence of slope gradient and slope length,geocell size and strength,plant root density,and other parameters on the safety factor of shallow and deep stability was studied by parameter sensitivity analysis.The results show that laying only the geocell and planting grass in the geocell can increase the slip resistance safety factor of the shallow layer by 1.07 and 1.33,respectively,which are very significant.But the effect of improving the stability of the deep layer is relatively insignificant.Among the parameters,slope gradient,geocell height,geocell welding distance,and planting density have essential effects on the stability of geocell reinforced slope.The study can provide a reference for the optimization design of geocell reinforced slope.