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天然沉积过程中形成的软黏土结构性,在基坑、隧道等施工过程中,将不可避免的受到不同程度的扰动破坏,相应地,土体的力学特性也与结构性软黏土存在明显差异。为研究扰动软黏土的变形、强度特性,对厚壁取样器得到的某地第四层淤泥质软黏土进行等向压缩试验和固结排水剪切试验,确定其压缩曲线和应力比-应变曲线特点。用扩展剑桥模型对应力比-应变-体变曲线进行弹塑性模拟,并与试验数据的对比结果显示:考虑粘聚力pr的扩展剑桥模型很好的描述扰动软黏土的强度、变形特性,且随着pr值的减小,扩展剑桥模型退化为修正剑桥模型。扩展剑桥模型是一个适用于扰动软黏土的简单实用模型。
The structural properties of soft clay formed during natural sedimentation will inevitably be disturbed and disturbed in the process of foundation pit and tunnel construction. Correspondingly, the mechanical properties of soils are obviously different from those of structural soft clay. In order to study the deformation and strength characteristics of the disturbed soft clay, an isostatic compression test and a consolidation drainage test were conducted on the fourth layer of muddy clay obtained from the thick wall sampler. The compression curves and stress-strain curves Features. The elastic-plastic simulation of the stress-strain-volume curve of the extended Cambridge model is performed and compared with the experimental data. The results show that the extended Cambridge model considering cohesion pr is a good description of the strength and deformation characteristics of the disturbed soft clay As pr decreases, the extended Cambridge model degenerates into a modified Cambridge model. The extended Cambridge model is a simple, practical model for disturbing soft clay.