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常规的应力路径表示方法,难以刻画粘性土三轴试验中原状土试样和重塑土试样在初始各向异性方面存在的差别,也无法给出原状土试样的压缩强度较大而拉伸强度较小现象产生的原因。对此,从等压固结和K0固结的初始应力状态特征入手,研究了不同后续加载条件对三轴试样前期应力状态的影响。结果表明,决定试样屈服和破坏的应力是考虑了试样初始应力各向异性基础之后的实质应力。原状试样等压固结三轴试验和原状试样K0固结三轴试验在实质应力p′、q′空间中的应力路径和破坏曲线,合理解释了不同前期固结条件对试样强度有显著影响。
Conventional stress path representation is difficult to characterize the differences in the initial anisotropy of undisturbed soil specimens and remolded soil specimens in the triaxial tests of cohesive soil. It is also not possible to give a large compressive strength of undisturbed specimens Tensile strength of the smaller reasons. In this regard, starting from the characteristics of the initial stress state of isobaric consolidation and K0 consolidation, the influence of different subsequent loading conditions on the pre-stress state of triaxial specimens was studied. The results show that the stress that determines the yield and failure of the specimen is the real stress after considering the initial stress anisotropy of the specimen. The stress path and failure curves in the stress-free p ’, q’ space of the uncoated three-axis test and the K0 consolidation three-axis test of the uncoated specimen can reasonably explain the influence of different pre-consolidation conditions on the strength of the specimen Significantly affected.