Effects and global sensitivity analysis of vibrator-ground coupling parameters on ground force under excitation of sweep frequency
Effects and global sensitivity analysis of vibrator-ground coupling parameters on ground force under excitation of sweep frequency
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扫频激励下振子地耦合参数对地力的影响及全局灵敏度分析
DOI：
10.1016/j.istruc.2022.07.087
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发表时间：
2022-10
期刊：
影响因子：
4.1
通讯作者：
Jiajia Yao
中科院分区：
文献类型：
--
作者：
Gang Li;Guangming Xu;Yaping Ding;Zhiqiang Huang;Lei He;Jiajia Yao
地面力是评价可控震源输出性能的关键指标。为了产生期望的地面力，必须研究耦合参数与地面力之间的关系。提出了一种基于半空间理论的地面力计算方法，并通过现场试验验证了该方法的有效性。通过对耦合参数的分析，确定了底板质量、反力质量、底板面积、土体弹性模数和土体密度进行分析。研究了耦合参数变化对地面力的影响。结果表明，在不同的频率下，各参数对地面力的影响程度不同。较大的反应质量有利于20赫兹以下的较大振动输出。较小的底板质量、较大的底板面积和较高的土体密度有利于增加20-50 Hz频段的地面力。此外，土的弹性模数越大，超过50赫兹的地力越大。在此基础上，利用Sobol方法对地面力进行了全局灵敏度分析。结果表明，在低频段，地面力主要由反力质量决定。在相互作用显著的情况下，土的弹性模数对高频地力的影响很大，其次是底板质量、底板面积和土的密度。
Ground force is the key index to evaluate the output of the seismic vibrator. To generate desired ground force, the relationship between coupling parameters and ground force should be investigated. In this paper, a method for calculating ground force is proposed based on half-space theory, and its validity is carried out by field test. According to the analysis of coupling parameters, the baseplate’s mass, the mass of reaction-mass, the baseplate area, the soil elastic modulus, and the soil density are determined to be analyzed. The ground forces under the changes of coupling parameters are studied. Results show that each parameter has a different contribution to affecting the ground force at different frequencies. The heavier reaction mass is beneficial for greater vibration output below 20 Hz. Smaller baseplate mass, bigger baseplate area, and higher soil density are helpful to increase ground force in the band of 20–50 Hz. In addition, higher soil elastic modulus brings greater ground force beyond 50 Hz. Then global sensitivity analysis for ground force is investigated with Sobol’s method. It indicates that the ground force is dominated by the reaction mass at low frequencies. With significant interactions, the soil elastic modulus has a great effect on the ground force at high frequencies, followed by the baseplate’s mass, baseplate area, and soil density.
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