公路岩质边坡植被修复及生态防护景观营造研究

为应对四川省自贡市公路建设中面临的地形复杂、地质破碎、生态敏感和气候极端等工程难题,提升城市主干线大型绿化带的生态景观品质,采用植被生态修复防护技术,构建土壤生境、植被群落和物质循环3个系统。通过物理防护、抗蚀防护和植被生态修复防护3种措施,实现边坡的稳定性和生态环境的改善。研究结果表明,该技术能有效恢复植被生产力,保持名贵乔木的养分,并促进其快速生长,提高公路的安全性和美观度。

植被混凝土新型生境构筑基材稳定性分析

利用植被混凝土生态技术修复的边坡,其失稳破坏问题仍然存在,利用不同破坏模式下的剪切应力—位移曲线,在确定滑面上进行受力分析,考虑降雨对基材重度、冲刷作用及剪切应力折减的影响,确定了基材安全系数与位移变化关系,对新型基材构筑方式进行稳定性分析,对口型坑贡献率进行评价。结果表明:新型构筑方式能有效增大各工况下基材破坏位移,天然状态下为喷播基材的1.25~1.46倍,降雨时为喷播基材的1.14~1.25倍。施工后,随着根土复合体逐渐形成,两种构筑方式下的安全系数可增加为原来的1.53~1.6倍。安全系数随着口型坑尺寸增大,基材破坏位移、贡献率逐渐增加。算例表明,口型坑最大贡献率能达到88.52%。

Slope Protection with Vegetation of Baoji(Shaanxi)-Hanzhong(Shaanxi) Expressway

With expressway development and environment protection consciousness improving, slope protection technology with vegetation has drawn much more attention. From the perspective of ecology, Baoji-Hanzhong Expressway maximized slope protection technology with vegetation and formed attracting landscapes on basis of eco-protection. This research introduced the technology of Baoji-Hanzhong Expressway, and explored a low-cost and effective biological slopeprotection way, suitable for Baoji-Hanzhong Expressway, according to slope protection technologies, at home and abroad, with botany, water and soil conservation engineering, and architecture, which fixed and stabilized slopes, prevented rainfall scouring, and advanced slope protection development in China.