南京地区冻结粉质黏土邓肯–张模型参数试验研究

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摘要通过冻结状态下三轴剪切试验，主要研究南京地铁冻结粉质黏土的抗剪强度和变形特性。结果表明：温度越低，土体抗剪强度越大。据此建立了以温度、围压为影响因素的冻结粉质黏土邓肯–张本构模型，并得出模型参数a，b；破坏强度与极限强度的比值为，其值为0.77～0.91，均值为0.86。将模型计算的应力–应变曲线与试验所得应力–应变曲线相比较，发现两者吻合较好。对比结果说明模型能够较好反映不同围压、温度条件下冻结粉质黏土的强度和变形特性。研究成果为人工冻结法在南京地铁中的应用提供一定参考。

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关键词 ：土力学；冻土抗剪强度；温度；围压；三轴剪切试验；邓肯&ndash, 张模型

Abstract：Through triaxial shear tests，the shear strength and deformation characteristics of frozen silty clay of Nanjing Metro were mainly focused on. Then，Duncan-Chang model for frozen silty clay was established，considering the coupling of confining pressure and temperature. The results show that the shear strength increases with decrease of temperature. Accordingly，the parameters a and b can be obtained. In addition，the ratio of breaking strength to ultimate strength is acquired with value between 0.77 and 0.91，averaging 0.86. Comparing with the ( )- curve calculated by Duncan-Chang model and that obtained by experiments，it is observed that the two match well，suggesting that the model can reflect strength and deformation characteristics of frozen silty clay under different confining pressures and temperature conditions. The results will provide reference to the artificial freezing method employed in Nanjing Metro.

Key words： soil mechanics shear strength of frozen soil temperature confining pressure triaxial shear test Duncan-Chang model

收稿日期: 2013-08-13

引用本文:

孙谷雨，杨平，刘贯荣. 南京地区冻结粉质黏土邓肯–张模型参数试验研究[J]. 岩石力学与工程学报, 2014, 33(sl): 2989-2995.
SUN Guyu，YANG Ping，LIU Guanrong . EXPERIMENTAL TEST ON CONSTITUTIVE RELATIONSHIP OF NANJING FROZEN SILTY CLAY CONSIDERING DUNCAN-CHANG MODEL. , 2014, 33(sl): 2989-2995.

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http://www.rockmech.org/CN/Y2014/V33/Isl/2989

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