弃土边坡竹筋加固机理及坡体稳定性影响  

Reinforcement mechanism of bamboo on spoil slope and influence on slope stability

作　　者：朱颖 李悦 张舶航 ZHU Ying;LI Yue;ZHANG Bohang(Jiangsu Engineering Survey and Research Institute Co.,Ltd.,Yangzhou 225000,Jiangsu,China)

机构地区：[1]江苏省工程勘测研究院有限责任公司,江苏扬州225000

出　　处：《工程建设》2024年第11期29-33,共5页Engineering Construction

摘　　要：攀西地区昔格达土由于工程性质差,容易引发公路临时弃堆体边坡失稳现象。竹筋加固方法具有就地取材方便、价格低廉等优点,在工程应用增多,但对其系统的研究较为匮乏。为此,本文以四川攀西地区某公路一临时弃土场为例,通过理论分析、加筋弃土三轴试验、有限元分析方法,探讨弃土边坡竹筋加固机理及竹筋加固间距对弃土边坡稳定性影响。结果表明:1)竹筋对土体整体性的提升作用明显,与未加筋土体相比,表现出“强”黏聚力的特性,且加筋土体的抗剪强度显著提高;2)筋带间距与弃土场边坡的安全系数呈反比例非线性变化关系,当间距超过1500 mm时,竹筋对边坡加固效应急剧减弱;3)昔格达土筋带间距宜取350 mm。本文研究结果可为此类弃土工程的临时支挡防护提供参鉴。Due to the poor engineering nature,the Xigeda soil in Panxi area is easy to cause the instability of the slope of the temporary spoil slope of the highway.The bamboo reinforcement method has the advantages of convenient local materials and low price,and the engineering application has been increased,but the research on its system is relatively scarce.Therefore,a temporary spoil of a highway in Panxi area of Sichuan province is taken as an example,and the mechanism of bamboo reinforcement of spoil slope and the influence of bamboo reinforcement spacing on the stability of spoil slope is discussed through theoretical analysis,triaxial test of reinforced spoil and finite element analysis.The results show that:1)Compared with the unreinforced soil,the bamboo reinforcement has a significant effect on the improvement of soil integrity,and the shear strength of the reinforced soil is significantly improved.2)The spacing of the reinforcement belt has an inverse proportional nonlinear relationship with the safety factor of the spoilslope,and when the spacing exceeds 1,500 mm,the effect of bamboo reinforcement on the slope is weakened sharply.3)The spacing of the soil reinforcement belt should be 350 mm.The results can provide references for the temporary support protection of similar spoil projects.

关 键 词：弃土边坡 竹筋加固 有限元分析 坡体稳定性 

分 类 号：TU43[建筑科学—岩土工程]