加筋格宾新型组合支挡结构设计研究

依托湖南省湘潭至衡阳西线高速公路K 124+300~K 124+895段国内首座加筋格宾组合式挡土墙工程,介绍了以双绞合六边形金属网为筋材的2种新型加筋支挡结构:加筋格宾结构与绿色加筋格宾结构;以极限平衡理论为基础,吸收国外先进加筋土技术,提出了该组合结构的稳定性验算方法与公式;编制相关程序,深入研究了填料粘聚力、内摩擦角、网面拉力、地震力、填土重度、车辆荷载以及加筋间距等重要参数对安全系数的影响。研究表明,各设计参数对安全系数的影响程度不同。同时,也验证了该加筋格宾组合式挡土墙设计的科学性和合理性。研究成果可应用于具体支挡结构设计。

Study on Design of New Compound Supporting and Retaining Structure with Reinforced Gabion

Based on the first expressway reinforced gabion retaining wall in China(reinforced earth engineering of Xiangtan to Hengyang express highway section of K124+300～K124+895 in Hunan province),two new retaining structure types(the reinforced gabion retaining wall and the green reinforced gabion retaining wall)are presented.Utilizing limit equilibrium theory and widely absorbing foreign advanced reinforced earth technology,the checking method for external and internal stability of these compound structures is put forward and corresponding computer programs are developed to research the influences of cohesion c,internal friction angle φ,tension,earthquake force,gravity density and vehicle load on safety factor.Results show that the influence degrees of design parameters on safety factor are different from each other.Meanwhile,it also proves that the design of this reinforced gabion retaining wall is scientific and reasonable.Thus it can be effectively used as guideline for engineering-oriented design.