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为了研究结构性原状黄土在加载条件下的破坏特性,采用试验的方法对Q2原状黄土进行了非饱和土三轴剪切试验研究。基于试验成果,定义了可以考虑球应力、偏应力和基质吸力等因素的土的结构性变量参数m。利用通过试验提出的m的计算方法,找出抗剪强度参数c、?值与m之间的关系,推导出m与c、?值的曲线方程,分别将曲线方程代入到Drucker-Prager(D-P)准则方程中对其进行修正,建立了结构性Q2原状黄土的修正屈服准则,该准则可以考虑Q2原状黄土的结构性影响,符合黄土的结构性特性,绘制出可反应结构性参数影响的屈服面,并验证了其合理性。
In order to study the failure characteristics of intact intact loess under loading conditions, the triaxial shear tests of unsaturated intact loess for Q2 undisturbed loess were carried out by using the experimental method. Based on the experimental results, we define the structural variable parameter m of soil which can consider the factors of ball stress, deviatoric stress and matrix suction. The relationship between shear strength parameters c,? And m is derived by the calculation method of m proposed by the experiment, and the equation of the equation for m and c,? Is deduced. The curve equations are respectively substituted into Drucker-Prager DP ), The modified yield criterion of structural intact Q2 loess is established, which can consider the structural effect of Q2 undisturbed loess, accord with the structural characteristics of loess and draw the yield of the influence of structural parameters Surface, and verify its rationality.