基于FBG技术的饱和膨胀土失水致裂过程试验研究

张丹 徐洪钟 施斌 刘亮亮

张丹, 徐洪钟, 施斌, 刘亮亮. 2012: 基于FBG技术的饱和膨胀土失水致裂过程试验研究. 工程地质学报, 20(1): 103-108.
引用本文: 张丹, 徐洪钟, 施斌, 刘亮亮. 2012: 基于FBG技术的饱和膨胀土失水致裂过程试验研究. 工程地质学报, 20(1): 103-108.
ZHANG Dan, XU Hongzhong, SHI Bin, LIU Liangliang. 2012: FBG TECHNOLOGY BASED EXPERIMENTAL STUDIES ON CRACKING OF EXPANSIVE SOIL DUE TO DEHYDRATION. JOURNAL OF ENGINEERING GEOLOGY, 20(1): 103-108.
Citation: ZHANG Dan, XU Hongzhong, SHI Bin, LIU Liangliang. 2012: FBG TECHNOLOGY BASED EXPERIMENTAL STUDIES ON CRACKING OF EXPANSIVE SOIL DUE TO DEHYDRATION. JOURNAL OF ENGINEERING GEOLOGY, 20(1): 103-108.

基于FBG技术的饱和膨胀土失水致裂过程试验研究

基金项目: 

国家自然科学基金青年科学基金(40702045),国家重点基础研究发展计划(973计划)(2011CB710605),国家自然科学基金重点项目(40730739)

详细信息
    作者简介:

    张丹,从事工程地质和防灾减灾方面的研究.Email:zhangdan@nju.edu.cn

  • 中图分类号: TU443

FBG TECHNOLOGY BASED EXPERIMENTAL STUDIES ON CRACKING OF EXPANSIVE SOIL DUE TO DEHYDRATION

  • 摘要: 为了解饱和膨胀土在失水条件下,干缩裂隙发育过程中土体内的应变状态、分布以及变化规律,设计了一个长40cm、宽5cm、深3cm的一维模型槽,将3条FBG传感光栅串埋入饱和膨胀土试样中,对膨胀土不同位置的应变进行了测量,得到了土体失水干缩致裂过程中,各个FBG传感器的应变状态及其变化规律,并分析了首条干缩裂隙及其附近土体的应变分布特征及其时空演化规律。试验结果表明:随着土体含水率的降低,土体首先呈现出整体收缩,之后应变状态发生分异,呈现出拉张区和收缩区交替出现的分布规律; 位于最大收缩区的边缘,当FBG传感器的应变由压缩状态转变为拉伸状态,并且拉应变及其变化速率相对较大的区域将产生首条裂隙。可见,本文所采用的高空间分辨率FBG传感技术为分析膨胀土裂隙发育全过程、揭示膨胀土失水致裂机理,以及膨胀土裂隙性特征的研究提供了新的思路和技术手段。
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出版历程
  • 收稿日期:  2010-12-01
  • 修回日期:  2011-04-29

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