为探究循环荷载下土体内动应力响应特征及pH值变化对动应力累积效应的影响,对不同pH值花岗岩残积土进行了室内循环荷载试验。通过试样内埋设应力盒的方法,实时测得不同pH值试样内动应力响应值。试验结果表明:循环荷载下土中动应力和累积变形都随着循环次数的增加而增大;加载时,酸碱处理过的试样峰值应力显著增大;卸载后,碱处理过的试样残余应力也增大,且碱性越强,峰值应力和残余应力增长的幅度越大;碱性试样的动应力和变形均大于酸性试样和未经酸碱处理试样;动荷载下土体内部的附加应力滞后于应变,应变又滞后于外荷载。酸碱度的差异对花岗岩残积土的动应力响应有较大影响,实际工程中应对此问题予以重视。
Abstract
Indoor cyclic loading test was performed on residual soil of granite with varied pH value to obtain the dynamic stress response and the influence of pH value on it under cyclic loading. The dynamic stress response was measured by stress meters embedded in the specimens. Results illustrated that the dynamic stress response and cumulative deformation both increased with the proceeding of cyclic loading. The peak stress of dynamic stress response within acid or alkali treated specimens increased significantly during loading. After unloading, the residual stress of alkali treated samples also increased; with the increase of alkalinity, the increment of peak stress and residual stress augmented. The dynamic stress response and deformation response of alkaline samples were greater than those of acidic and non-treated samples. The additional stress within soil lagged behind strain, and the strain lagged behind the external load. The pH value had great influence on the dynamic stress response of granite residual soil, and therefore should be paid attention to in practical engineering.
关键词
花岗岩残积土 /
动应力 /
累积变形 /
循环荷载 /
pH值
Key words
granite residual soil /
dynamic stress /
cumulative deformation /
cyclic loading /
pH value
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基金
国家自然科学基金项目(41572277);广东省自然科学基金重点项目(C18140500000079)
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