爆破激振条件下的岩体阻尼测试方法研究

发布时间：2018-05-11 08:55

本文选题：岩石力学 + 岩体阻尼测试　；参考：《岩石力学与工程学报》2014年S1期

【摘要】：岩体阻尼是岩体的重要动力学参数。块体激振试验法是目前现场岩体阻尼测试最主要的方法,但这种测试方法耗费较大。通过爆破激振来测求岩体的阻尼比是一种相对简便、高效的方法,该方法需要扣除因能量的几何扩散而产生的几何阻尼的影响。为此按黏弹性阻尼模型推导出通过面波衰减计算岩体阻尼比的公式,并在海阳核电厂分别采用单孔和多孔爆破激振进行岩体阻尼试验,对得到的试验数据采用小波包进行分析。为检验该测试方法的测试效果,在同一场地按照规范进行激振试验测试,测试结果表明:通过爆破激振法测得的岩体阻尼比略大于通过块体激振法测得的岩体阻尼比,爆破激振法测得的岩体阻尼比随着爆源距的增加而减小,爆破激振的振动频率对测得的岩体阻尼比有一定影响。测试的对比结果表明利用爆破激振产生的岩体振动信号中的信息来计算岩体阻尼比具有一定的可行性。
[Abstract]:Rock mass damping is an important dynamic parameter of rock mass. The block vibration test method is the most important method to measure the rock mass damping at present, but this method is more expensive. It is a relatively simple and efficient method to measure the damping ratio of rock mass by blasting excitation. This method needs to deduct the influence of geometric damping caused by the geometric diffusion of energy. Based on the viscoelastic damping model, a formula for calculating the damping ratio of rock mass by surface wave attenuation is derived, and the rock mass damping test is carried out by single hole blasting and porous blasting at Haiyang Nuclear Power Plant. The obtained test data are analyzed with wavelet packet. In order to test the effect of the test method, the test results show that the damping ratio of rock mass measured by blasting vibration method is slightly larger than that by block vibration method, and the test results show that the damping ratio of rock mass measured by blasting induced vibration method is slightly larger than that of rock mass damping ratio measured by block excitation method. The damping ratio of rock mass measured by blasting induced vibration method decreases with the increase of blasting source distance, and the vibration frequency of blasting induced vibration has a certain effect on the measured rock mass damping ratio. The results show that it is feasible to calculate the damping ratio of rock mass by using the information in the vibration signal of rock mass induced by blasting.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;贵州省贵安新区规划建设管理局;
【基金】：国家杰出青年基金资助项目(51025935) 国家重点基础研究发展计划(973)项目(2010CB732001) 国家科技重大专项资助项目(2011ZX06002010 15)
【分类号】：TU45

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