| 罗正东*,谌灿,董辉,屈畅姿,谭荣晒,黄河.竹筋格栅加筋山区挖填路基承载变形机理研究[J].实验力学,2019,34(5):824~832 |
| 竹筋格栅加筋山区挖填路基承载变形机理研究 |
| Study of the bearing deformation mechanism of bamboo bamboo tendon grating strengthened subgrade excavation and filling in mountain area |
| 投稿时间：2018-04-23 修订日期：2018-05-23 |
| DOI：10.7520/1001-4888-18-083 |
| 中文关键词: 挖填路基 竹筋格栅 力学性能 路基加固 变形机理 |
| 英文关键词:subgrade excavation and filling bamboo tendon grating mechanical properties subgrade strengthening deformation mechanism |
| 基金项目:国家自然科学基金资助项目(51508489)；湖南省教育厅项目(16C1548)；岩土力学与工程安全湖南省重点实验室开放基金资助项目(16GES08);湖南省建设科技计划项目(KY201918) |
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| 中文摘要: |
| 为了在我国西部山区因地制宜、就地取材地利用加筋土技术，本文研究了竹筋格栅代替土工格栅在山区挖填路基结构加固应用中的可行性。首先，采用室内试验，对湘西楠竹竹筋的抗拉、抗压及抗剪力学性能进行了测试，将其与传统土工格栅的力学性能对比表明，竹筋格栅能够满足规范对加筋材料力学参数的要求；然后，通过现场拉拔试验，对不同法向应力下的竹筋格栅与填筑体界面特性进行研究，并对承载变形机理展开了分析；最后，利用Flac3D有限差分软件建立竹筋格栅加筋挖填路基的三维模型，就挖填交界处不加筋、加土工格栅及加竹筋格栅三种不同工况进行了对比分析，结果表明加筋能有效控制挖填路基的变形，提高路基承载力，且竹筋格栅的加筋效果优于土工格栅。上述结果可为竹筋格栅加筋土提供试验依据，为类似工程的设计、施工提供参考。 |
| 英文摘要: |
| In order to adapt measures to local conditions and take local raw material in reinforced earth technology in mountain areas of western China, in this paper, the feasibility of using bamboo tendon grating instead of geogrid to reinforce the subgrade excavation and filling in mountain areas. Firstly, through indoor experiment, the tensile, compression and shear mechanical properties of phyllostachys pubescens tendon taken from western Hunan were measured. Comparison of mechanical properties of phyllostachys pubescens tendon with that of the traditional geogrid shows that local bamboo tendon grating can meet the specification requirements for strengthening materials mechanical parameters. Then, through the field drawing experiment, the interface characteristics of the bamboo tendon grating and filling body subjected to different normal stresses were studied, and the mechanism of bearing deformation was analyzed. Finally, using Flac 3D finite difference software, 3D model of bamboo tendon grating strengthened subgrade was established, and the three different working conditions of unreinforced, traditional geogrid and Bamboo tendon grating at the junction of excavation and filling were compared and analyzed. Results show that the strengthened bamboo tendon grating can effectively control subgrade deformation and improve its bearing capacity, and the strengthening effect of bamboo tendon grating is better than that of traditional geogrid. Above results can provide experimental evidence for bamboo tendon grating strengthening, and provide an important reference for the design and construction of similar projects. |
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