分级循环荷载下岩石动力学行为试验研究

发布时间：2018-12-06 20:35

【摘要】：利用WDT-1500多功能材料试验机,对砂岩、砾岩和砂砾岩进行了分级循环荷载试验,研究了岩石的动弹性模量对应力幅值和应力水平的响应特性,得到了动弹性模量和耗散能随应力幅值、应力水平及含水率的变化规律。试验结果表明,分级循环荷载下岩石的能量耗散越多,动弹性模量越小;应力水平越高,动弹性模量和耗散能越大;含水率和应力幅值越大,动弹性模量越小,耗散能越大。讨论了邓肯-张模型能够描述分级循环荷载作用下岩石的应力-应变关系,构建了动弹性模量随应力水平、应力幅值及含水率变化的演化模型,探讨了模型参数的确定方法。根据能量耗散的经验法则,建立了耗散能演化模型,结果表明,该模型能够描述分级循环荷载过程中能量耗散行为。
[Abstract]:The cyclic loading tests of sandstone, conglomerate and sandy gravel were carried out by using WDT-1500 multifunctional material testing machine. The response of dynamic elastic modulus of rock to stress amplitude and stress level was studied. The variation of dynamic elastic modulus and dissipation energy with stress amplitude, stress level and moisture content are obtained. The experimental results show that the larger the energy dissipation, the smaller the dynamic elastic modulus; the higher the stress level, the greater the dynamic elastic modulus and dissipation energy, and the larger the moisture content and stress amplitude, the smaller the dynamic elastic modulus and dissipation energy. The Duncan-Chang model can describe the stress-strain relationship of rock under graded cyclic loading. The evolution model of dynamic elastic modulus with stress level, stress amplitude and moisture content is constructed, and the method of determining the parameters of the model is discussed. According to the rule of experience of energy dissipation, a dissipative energy evolution model is established. The results show that the model can describe the energy dissipation behavior in the process of graded cyclic loading.
【作者单位】：西安理工大学岩土工程研究所;
【基金】：国家自然科学基金资助项目(No.51179153);国家自然科学基金资助青年科学基金资助项目(No.51308456)
【分类号】：TU45

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