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岩体破坏前不可恢复的变形称为损伤,在不同的应力状态下损伤演化不同。实际工程中很多岩体都会经受循环加卸载的力学损伤行为。对白鹤滩玄武岩岩样开展了不同加载速率条件下的三轴逐级加卸载应力—应变试验,通过加卸载曲线滞回环的面积计算得到每次循环的能量耗散值;测得每次循环中加载曲线和卸载曲线的弹性模量,利用岩样在每次循环中弹性模量的衰退程度定义损伤变量。分别定量分析累积损伤变量(前N(N≤10)次的损伤系数之和)和累积单位体积耗散能随加卸载次数及偏应力的变化关系,最终建立了累积损伤变量与累积单位体积耗散能的本构模型。
Unrecoverable deformation before rock mass destruction is called damage, and the damage evolution is different under different stress states. In practice, many rock masses are subject to the mechanical damage behavior of cyclic loading and unloading. Three-axis progressive loading-unloading stress-strain test under different loading rates was carried out on whitehorse basaltic rock samples. The energy dissipation value of each cycle was calculated by the area of the hysteresis loop of the loading-unloading curve. In each cycle The elastic modulus of the loading curve and the unloading curve is defined by the degree of decay of elastic modulus in each cycle of the rock specimen. The quantitative analysis of cumulative damage variables (sum of damage index before N (N≤10)) and the relationship between cumulative unit volume dissipation energy and loading-unloading frequency and deviatoric stress were carried out. Finally, the cumulative damage variables and cumulative unit volume consumption Constitutive model of scattered energy.