干湿循环下压实红黏土三轴试验

发布时间：2018-11-07 19:53

【摘要】：以余庆-凯里高速公路12标土样为研究对象,采用三轴试验研究了两种干湿循环方式(先干后湿和先湿后干)对压实红黏土抗剪强度指标的变化规律,并对干湿循环下边坡稳定性计算参数进行了探讨。研究结果表明,干湿循环作用显著降低了压实红黏土的抗剪强度指标,其中第一次衰减幅度很大,但经过一定次数的干湿循环作用后,强度指标趋于稳定状态。干湿循环对压实红黏土黏聚力的影响比内摩擦角影响要大。不同的干湿循环路径对压实红黏土抗剪强度指标影响的规律基本一致,但是先湿后干条件下压实红黏土抗剪强度指标比先干后湿要大。干湿循环下边坡稳定性计算参数取值建议采用长期强度指标值,黏聚力稳定值未经循环值的45%~55%,内摩擦角稳定值为未经循环值的45%~65%。研究结果更好地为红黏土地区工程建设提供技术依据。
[Abstract]:Taking 12 standard soil samples of Yuqing-Kaili Expressway as the research object, the variation of shear strength index of compacted red clay by two kinds of dry and wet circulation methods (first dry and wet first and wet later) was studied by triaxial test. The calculation parameters of slope stability under dry and wet circulation are also discussed. The results show that the shear strength of compacted red clay is significantly reduced by dry and wet cycling, and the first attenuation range is very large, but after a certain number of dry and wet cycles, the strength index tends to be stable. The effect of dry and wet cycle on the cohesion of compacted red clay is greater than that of internal friction angle. The effect of different dry and wet circulation paths on the shear strength of compacted red clay is basically the same, but the shear strength index of compacted red clay is larger than that of dry and dry compacted red clay. The calculation parameters of slope stability under dry and wet cycles should adopt the long-term strength index value, the cohesion stability value is not 45 / 55 of the cyclic value, and the stability value of the internal friction angle is 45 / 65 of the non-cyclic value. The results provide better technical basis for engineering construction in red clay area.
【作者单位】：贵州大学土木工程学院;
【基金】：国家自然科学基金项目,项目编号51368010,51668011 贵州省科技支撑计划项目,项目编号黔科合支撑[2016]2005 贵州科技厅-贵州大学联合资金项目,项目编号黔科合LH字[2014]7663
【分类号】：U412.22

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