泥质砂岩动弹模阻尼及能量耗散特性试验研究

An experimental study of the dynamic modulus,damping and energy dissipation characteristics of argillaceous mudstones

针对煤矿矿区受爆破地震波影响下泥质砂岩斜坡的稳定性问题,利用MTS 815试验机开展了波形为正弦波、频率1 Hz的岩石动三轴试验,对滞回圈应力—应变数据进行了准确分析,计算了泥质砂岩的动弹性模量及阻尼参数,以及在循环动力作用下单位体积能、单位弹性能、单位耗散能的演化规律。研究中发现耗散能与围压水平、动应力水平两者之间呈幂函数关系。对试验中出现的"突增或突减"现象进行了讨论和分析,初步归因于岩石具有蓄能的特性和动应力的"触发效应"、"累积效应",并指出这与天然或爆破地震波能触发斜坡崩塌的机理是一致的。本试验旨在为受爆破地震波影响的泥质砂岩斜坡稳定性分析指明研究方向和提供基础性的研究指标。

To study the stability of the argillaceous sandstone slope subjected to blasting wave in coal mining areas, the dynamic tri-axial test is carried out using the MTS 815 equipment, in which a sinusoidal wave with a 1 Hz frequency is applied. The stress-strain data of hysteresis loops are precisely analyzed, and dynamic and damping parameters are calculated. The experiment ~veals the evolution laws of volumetric energy, elastic energy and dissipated energy. The relationship between the volumetric dissipated energy and confining pressure or dynamic stress is a power function. The existing mutation is analyzed and discussed, which is attributed to energy storage of rocks, and ＂accumulation effect＂ and ＂triggered effect＂ of stress waves induced by the tri-axial test. Furthermore, it is consistent with the mechanism of seismic wave or blasting stress wave which can trigger slope collapse. The experiment is aimed to obtain direction and basic academic material for stability analysis of argillaceous sandstone slope subjected to blasting wave.