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微差爆破可以创造出与天然地震相类似的振动环境。为了更好地对爆破模拟天然地震进行研究和评价,在LS-DYNA软件框架内,建立了适合于爆炸荷载作用下土体动力分析的实用模型,对原位土体场地爆破地震动试验进行了全尺寸数值模拟,并将模拟结果与现场实测数据进行比较分析,验证数值计算的准确性。计算结果表明,模拟得到的场地质点加速度-时程与实测数据比较吻合,因此,可以预先利用数值手段为试验方案设计提供指导;同时,数值模拟还总结了现场试验中未得到的场地压力变化规律和振动规律,分析了爆破地震动与天然地震的异同,丰富了爆破地震动的研究,表明利用爆破手段能够近似地模拟天然地震,为微差爆破模拟天然地震的研究工作提供了经济、简便而实用的方法。
Millisecond blasting creates a vibrational environment similar to natural earthquakes. In order to better study and evaluate the natural earthquake with blasting simulation, a practical model suitable for dynamical analysis of soil under explosive load is established in the framework of LS-DYNA software. The ground motion test of in-situ soil is carried out Full-scale numerical simulation, and the simulation results and field measurements to compare the data to verify the accuracy of numerical calculations. The calculated results show that the simulated acceleration-time series of the site agrees well with the measured data, so numerical methods can be used to guide the design of the experimental scheme in advance. Meanwhile, the numerical simulation also summarizes the field pressure changes un-obtained in the field test Regularity and law of vibration, the similarities and differences of blasting earthquakes and natural earthquakes are analyzed, and the research of blasting earthquakes is enriched. It is shown that the natural earthquakes can be approximated by means of blasting, which provides an economical and simple method for the research of natural earthquakes The practical method.