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作 者:姚晓亮 王文丽 王莉平[1] YAO Xiaoliang;WANG Wenli;WANG Liping(State Key Laboratory of Water Engineering Ecology and Environment Arid Area,Xi'an University of Technology,710048 Xi'an,China)
机构地区:[1]西安理工大学旱区水工程生态环境全国重点实验室,西安710048
出 处:《应用力学学报》2025年第2期388-394,共7页Chinese Journal of Applied Mechanics
基 金:国家自然科学基金资助项目(No.42272319,52378368,42172314)。
摘 要:以冻结标准砂为研究对象,基于三轴压缩和蠕变试验结果提出了适用于蠕变条件的强度参数获取方法。使用相同应变速率和不同围压条件下的压缩试验结果,得到了冻土强度包络线的形状参数;结合压缩和蠕变条件下平面应变试验得到的剪切带倾角数据验证了通过压缩试验结果确定蠕变条件下强度包络线形状参数的有效性;使用相同围压不同轴向压力下的蠕变试验结果分析得到了表征强度包络线位置的黏聚力衰减函数。结合本研究获取的强度包络线参数计算分析表明,冻土蠕变发展过程中出现的3个不同蠕变阶段主要取决于强度包络线与应力状态点的相对位置,即:强度包络线位置高于、接近以及低于应力状态点的3种状态对应于蠕变速率发展的衰减、匀速以及急剧增大3个阶段。A kind of strength parameters obtaining method was proposed based on triaxial compression and creep test results of a standard frozen sand.One frozen standard sand was taken as study object.Based on the compression test results,the shape parameters of the frozen sand strength envelope were obtained,and the effectiveness of the shape parameters under creep conditions was verified with test results of shear band inclination angle measured from previous plane strain test;with the creep test results,the cohesion attenuation function representing the position of the strength envelope was determined.With the strength envelope parameter obtained in this paper,the development law of the frozen sand creep strain was analyzed.It is indicated that the three different creep stages are mainly dependent on the relative position between the strength envelope and stress point,i.e.,the three creep stages with strain rate decreasing,essentially constant and sharply increasing are corresponding to the three different relative positions with strength envelope is higher than,close to and lower than the stress point.
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