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土体含水状态对黄土边坡剥落病害产生的影响

, PP. 18-24

Keywords: 道路工程,路堑边坡,直剪试验,黄土,剥落病害,含水状态

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Abstract:

?对不同含水状态下的土试样开展宏观裂缝分析及室内直剪试验,研究黄土试样在不同含水状态下裂隙发育扩展过程,分析在不同干湿循环次数、不同增湿、减湿变化幅度条件下剪切强度的变化规律,探讨黄土体含水状态对边坡剥落病害的影响。结果表明:洛川黄土粘粒含量大,土体吸水性强,崩解性强;在增湿、减湿过程土体内部均会产生裂隙,土体结构发生不同程度的破坏;随着干湿循环次数及循环幅度的增加,土试样表面裂隙不断扩展、延伸,内部结构破坏程度增加;当土体内部某个优势面贯通时,沿着优势面发生剥落病害。

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