本文選題：巖石力學(xué) + 巖體阻尼測試��； 參考：《巖石力學(xué)與工程學(xué)報》2014年S1期

【摘要】：巖體阻尼是巖體的重要動力學(xué)參數(shù)。塊體激振試驗法是目前現(xiàn)場巖體阻尼測試最主要的方法,但這種測試方法耗費較大。通過爆破激振來測求巖體的阻尼比是一種相對簡便、高效的方法,該方法需要扣除因能量的幾何擴散而產(chǎn)生的幾何阻尼的影響。為此按黏彈性阻尼模型推導(dǎo)出通過面波衰減計算巖體阻尼比的公式,并在海陽核電廠分別采用單孔和多孔爆破激振進行巖體阻尼試驗,對得到的試驗數(shù)據(jù)采用小波包進行分析。為檢驗該測試方法的測試效果,在同一場地按照規(guī)范進行激振試驗測試,測試結(jié)果表明:通過爆破激振法測得的巖體阻尼比略大于通過塊體激振法測得的巖體阻尼比,爆破激振法測得的巖體阻尼比隨著爆源距的增加而減小,爆破激振的振動頻率對測得的巖體阻尼比有一定影響。測試的對比結(jié)果表明利用爆破激振產(chǎn)生的巖體振動信號中的信息來計算巖體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.
【作者單位】： 中國科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國家重點實驗室;貴州省貴安新區(qū)規(guī)劃建設(shè)管理局;
【基金】：國家杰出青年基金資助項目(51025935) 國家重點基礎(chǔ)研究發(fā)展計劃(973)項目(2010CB732001) 國家科技重大專項資助項目(2011ZX06002010 15)
【分類號】：TU45

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