可视大模型加筋土直剪数采仪的研发与应用

发布时间：2018-01-14 12:47

本文关键词：可视大模型加筋土直剪数采仪的研发与应用　出处：《岩土力学》2017年05期 　论文类型：期刊论文

【摘要】：研制了一台适用于多种工况下的大尺寸可视直剪试验仪器,可开展不同土工合成材料与土体作用的直剪试验。该仪器改进了加载方式与反力系统,实现了直剪试验正面可视及自动化采集试验数据,并可测量土工物在土中的应变,为探索筋土界面特性与筋土受力机制以及筋土位移分析提供了新的可能。使用新研制的试验装置开展了以砾类粗粒土为填料的土工格栅直剪试验,试验结果表明:加筋土较素土的界面内聚力增加,内摩擦角降低;格栅应变总体随着剪切位移的增加而增大,格栅横肋与土体的嵌阻力快速增大造成格栅应变增长较快,但直剪作用使格栅产生的最大应变值远小于格栅的屈服应变值。素粗粒土直剪界面厚度小于格栅加筋土的界面厚度,在筋土直剪界面处粗粒土主要以平移运动为主,同时部分中小颗粒存在平转位移模式。
[Abstract]:Developed a suitable for various working conditions of large size direct shear test of visual instrument, direct shear test can be carried out in different geosynthetics and soil. This instrument is improved and the counter force loading system, realize the direct shear test positive visual and automation test data collected, and strain measurement of soil. In the soil, in order to explore the reinforced soil interface characteristics and stress mechanism of reinforced soil and reinforced soil displacement analysis may provide new. Using this test device was carried out with gravel and coarse grained soil filler for Geogrid direct shear test, test results show that the reinforced soil is soil interface increase the cohesion, internal friction angle decreased; the overall grid strain increases with the increase of shear displacement, block resistance grille transverse ribs and a rapid increase in the soil caused by grid strain grew rapidly, but the maximum shear strain effect of the grid generated value is far less than The yield strain value of grille, the interface thickness of plain coarse grained soil direct shear interface is smaller than that of grid reinforced soil. At the interface between reinforcement and soil, the coarse grained soil mainly takes translational motion, while some small and medium-sized particles have lateral displacement mode.

【作者单位】：广西科技大学土木建筑工程学院;哈尔滨工业大学深圳研究生院;
【基金】：国家自然科学基金项目(No.51469005,No.51009030) 广西自然科学基金项目(No.2015GXNSFAA139257,No.2015GXNSFAA139270)~~
【分类号】：TU415
【正文快照】： 岩土工程中对于边坡(滑坡)等地质灾害的发生及其防治问题研究,除了进行理论分析和现场测试外,更多地要借助岩土体地质力学模型试验来解决[1]。失稳破坏都伴随着剪切位移的发展,因此,通过施加剪切力(或剪切位移)对岩土体进行试验的方法一直受到重视,其中,直剪试验由于其操作简

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