干湿循环下花岗岩残积土强度衰减试验研究

发布时间：2018-10-08 09:52

【摘要】：季节性的干湿交替循环作用可使边坡岩土体强度劣化,影响边坡安全性及耐久性。通过室内干湿循环模拟试验,探讨了干湿循环作用下花岗岩残积土抗剪强度随含水率、干湿循环次数的变化规律。试验结果表明:干湿循环下花岗岩残积土黏聚力前期衰减趋势明显,后期衰减趋势减缓,并逐渐趋于稳定;而花岗岩残积土内摩擦角在干湿循环下未呈现明显的变化规律,大小变化不定。在此基础上,采用S型曲线函数对花岗岩残积土强度衰减曲线进行拟合,拟合结果说明S型曲线函数能够较好地体现花岗岩残积土黏聚力随循环次数的衰减规律。研究成果对进一步揭示干湿循环下闽东南地区花岗岩残积土强度劣化机理具有重要的参考价值。
[Abstract]:Seasonal dry and wet alternating circulation can make the slope rock and soil strength deteriorate, and affect the slope safety and durability. The shear strength of granite residual soil under dry and wet cycle was studied by laboratory dry and wet cycle simulation tests. The variation of shear strength with moisture content and times of dry and wet cycles was discussed. The experimental results show that under dry and wet cycles, the cohesive strength of granite residual soils attenuates obviously at the early stage, slows down at the later stage, and tends to be stable gradually, while the internal friction angle of the granite residual soils does not show obvious variation under the dry and wet cycles. The size varies. On this basis, the strength attenuation curve of granite residual soil is fitted by using S-shaped curve function. The fitting results show that the S-type curve function can better reflect the attenuation law of the cohesive force of granite residual soil with the number of cycles. The research results have important reference value for further revealing the mechanism of strength deterioration of granite residual soil in southeast Fujian under dry and wet cycle.
【作者单位】：福州大学环境与资源学院;福州大学岩土工程与工程地质研究所;福建省交通规划设计院;
【基金】：福建省自然科学基金(2015J01164) 国土资源部丘陵山地地质灾害防治重点实验室开放基金(FJKLGP2012K001)资助
【分类号】：TU411;TU458

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