软弱夹层岩质边坡长期稳定性研究

发布时间：2018-05-05 23:56

本文选题：Cvisc蠕变模型 + 边坡　；参考：《中外公路》2017年04期

【摘要】：为了研究软弱夹层对岩质边坡长期稳定性的影响,以炭质泥岩软弱夹层为例,基于Cvisc蠕变本构模型,采用强度折减法对所研究的岩质边坡的长期稳定性进行了FLAC3D分析,并与相同条件下弹塑性模型FLAC3D计算结果进行了对比。结果表明:考虑软弱夹层的蠕变特性与否,对边坡的长期稳定性影响很大,当考虑其蠕变特性时,软弱夹层中监测点最终位移量是不考虑蠕变特性时的2~2.5倍;考虑蠕变特性时的边坡安全系数为1.26,不考虑蠕变特性时的边坡安全系数则为1.43,相比之下,前者比后者的边坡安全系数降低了15%,充分表明了炭质泥岩软弱夹层的蠕变特性对边坡稳定性的影响。
[Abstract]:In order to study the influence of weak intercalation on the long-term stability of rock slope, taking carbonaceous mudstone weak intercalation as an example, based on Cvisc creep constitutive model, the long-term stability of the studied rock slope is analyzed by using strength reduction method. The results are compared with the FLAC3D results of the elastoplastic model under the same conditions. The results show that the long-term stability of the slope is greatly affected by considering the creep characteristics of the weak intercalation. When the creep characteristics are considered, the final displacement of the monitoring point in the weak intercalation is 22.5 times greater than that without the creep characteristic. The slope safety factor is 1.26 when the creep characteristic is considered, and 1.43 when the creep characteristic is not taken into account. The safety factor of the former is 15% lower than that of the latter, which fully shows the influence of creep characteristics of the weak intercalation of carbonaceous mudstone on the slope stability.
【作者单位】：长沙理工大学土木与建筑学院;
【基金】：国家自然科学基金资助项目(编号:51378082,51674041)
【分类号】：U416.14

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