水泥材料静爆拉伸破裂微震显现特征

发布时间：2018-03-11 05:37

本文选题：水泥砂浆　切入点：静爆拉伸　出处：《土木工程学报》2017年11期 　论文类型：期刊论文

【摘要】：微震技术是混凝土工程稳定性监测的重要手段,掌握材料破裂微震信号的特征指标是准确预测的前提。利用静态破碎剂实现试件不同速率的静爆拉伸破坏,通过煤岩动力灾害试验模拟系统(ZDKT-1型)实时监测该破裂过程中的微震信号。分析水泥砂浆静爆拉伸破裂微震信号幅值、能量及频谱等的变化规律,研究发现:(1)水泥砂浆试件属准均质材料,静爆后均出现3条纵向裂纹,无横向裂纹;(2)微震信号的幅值、频谱均与静爆拉伸破裂速率有关,破裂速率越大,信号平均幅值越大,频域越宽;(3)微震信号事件数与最终的破裂总裂纹面积有关,裂纹面积越大,破坏过程中出现的微震事件越多;(4)静爆拉伸破裂中的微震信号并不是均匀出现的,整个过程中信号阵发性明显;信号幅值也不存在某种单调趋势,信号幅值及能量呈现弱强相间的变化分布。
[Abstract]:The microseismic technique is an important means for monitoring the stability of concrete engineering. It is the premise of accurate prediction to master the characteristic index of the microseismic signal of material rupture. The static breakage agent is used to realize the static explosive tensile failure of the specimen at different rates. The microseismic signals in the process of rupture are monitored in real time by the coal-rock dynamic disaster test simulation system (ZDKT-1). The variation rules of the amplitude, energy and frequency spectrum of the microseismic signals of the static explosive tensile rupture of cement mortar are analyzed. It is found that the cement mortar specimen is a quasi-homogeneous material with three longitudinal cracks and no transverse crack. The amplitude of the microseismic signal is related to the tensile rupture rate of the static explosion. The larger the rupture rate, the greater the average amplitude of the signal. The number of microseismic events in frequency domain is related to the final total crack area, and the larger the crack area, the more microseismic events occur in the process of failure. In the whole process, the paroxysmal signal is obvious, and the amplitude of the signal does not have a monotonic trend, and the amplitude and energy of the signal show the variation distribution of the weak strong phase.
【作者单位】：福州大学;中国矿业大学(北京);
【基金】：国家自然科学基金(51604083) 福州大学科研启动基金(510200)
【分类号】：TV32

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