纤维风沙土静力特性三轴试验研究

Research on static behavior of fiber reinforced eolian sand soil under traxial compression tests

纤维土加筋技术是改善工程性质不良风沙土的一种有效途径,因此,研究纤维风沙土力学性质具有重要的现实意义。对纤维风沙土进行大量的三轴压缩试验,通过分析其应力—应变关系,探讨其归一化特性。结果表明:选取试样剪切破坏时应力、应变作为应力—应变归一化参考点进行归一化,具有很好的归一化特性。应变软化型纤维风沙土的归一化ε0/q0-ε0曲线为抛物线关系,应变硬化型纤维风沙土的归一化ε0/q0-ε0曲线为线性关系,提出归一化剪应力—剪应变关系式。对比结果表明:计算值与试验值拟合较好,说明纤维风沙土归一化剪应力—剪应变关系式是合理的。

Fiber reinforcement measure has been proposed as one effective technique to deal with eolian sand soil with bad engineering properties. Therefore, it is of practical importance to study the mechanical property of fiber reinforced eolian sand soil. Triaxial compression tests have been carried out on fiber reinforced eolian sand soil and the stress-strain relationships are analyzed in order to investigate the normalization characteristics of the mechanism property. The results show that, for specimen of shear failure, when the stress-strain point of failure is selected as reference point for normalization, the stress- strain data points have excellent normalization properties. For specimen of strain softening fiber reinforced eolian sand soil, the normalization curve is analogous to a parabola; for specimen of strain hardening FRS, the normalization curve is analogous to a straight line and the normalization math expression is developed. Comparison results show that the overall fitting results of test data are satisfactory. Therefore, the normalization math expression proposed is reasonable.