钻前工程竹筋加筋土工程特性试验研究

发布时间：2018-12-07 15:08

【摘要】：钻前工程井场公路使用周期短,车辆荷载大,路基病害严重。在盛产竹材地区,可利用防腐处理后的竹筋代替土工合成材料,应用于加筋土结构处治路基病害。通过筋材工程特性试验验证竹筋的适用性,与双向塑料土工格栅进行对比,结果表明:(1)竹筋抗拉强度约为土工格栅的20倍,弹性模量约为土工格栅的30倍,伸长率约为土工格栅的1/6,其作为加筋材料,满足抗拉要求;(2)竹筋的表面粗糙度、竹片侧面以及竹节(竹竿节隔)与土体的咬合与嵌固作用高于土工格栅,且竹筋的高抗拉性和低伸长率,对加筋土体有更好的稳定性和侧向约束性。除此之外,竹筋与铁丝(或U型钉)形成复合结构体系共同受力和变形,加强了筋土之间的连接。在加筋土体一定的条件下,竹筋加筋土体的界面摩擦性能优于土工格栅加筋土体;(3)竹筋加筋土体的峰值抗剪强度和残余强度较土工格栅加筋土体有所提高,且峰值应变区域增大,受力相同情况下,竹筋加筋土的位移值小于土工格栅加筋土。
[Abstract]:Before drilling, well site highway has short service cycle, heavy vehicle load and serious roadbed disease. In the bamboo-rich area, embalming bamboo bars can be used instead of geo-synthetic materials to treat roadbed diseases with reinforced soil structure. The applicability of bamboo bars is verified by the engineering characteristic test of steel bars. The results show that: (1) the tensile strength of bamboo bars is about 20 times of that of geogrid, and the elastic modulus of bamboo bars is about 30 times of that of geogrid, the results show that: (1) the tensile strength of bamboo bars is about 20 times of that of geogrid. The elongation of geogrid is about 1 / 6 of that of geogrid, which is used as reinforced material to meet the tensile requirements. (2) the surface roughness of bamboo bars, the bite and entrapment between bamboo segments and soil are higher than that of geogrid, and the high tensile resistance and low elongation of bamboo bars have better stability and lateral binding to reinforced soil. In addition, bamboo bars and wire (or U-shaped nails) form a composite structure system of stress and deformation, strengthening the connection between reinforcement and soil. Under certain conditions, the interface friction performance of bamboo reinforced soil is better than that of geogrid reinforced soil. (3) the peak shear strength and residual strength of bamboo-reinforced soil are higher than that of geogrid reinforced soil, and the peak strain region increases. Under the same stress, the displacement of bamboo-reinforced soil is smaller than that of geogrid reinforced soil.
【作者单位】：西南科技大学土木工程与建筑学院;西南交通大学土木工程学院;
【基金】：四川省教育厅项目(14zd1127) 国家自然科学基金资助项目(51108393)
【分类号】：U416.1;U414

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