【摘要】：針對相對均勻的平行結(jié)構(gòu)面,基于結(jié)構(gòu)面的線性接觸假設(shè),提出了一種利用錘擊試驗及數(shù)值反演獲得結(jié)構(gòu)面接觸剛度的方法。該方法實施時,在結(jié)構(gòu)面兩側(cè)分別布設(shè)若干支振動傳感器,在遠處利用激震錘進行激震,通過結(jié)構(gòu)面兩側(cè)垂直于結(jié)構(gòu)面方向和平行于結(jié)構(gòu)面方向振動傳感器的起跳時間,計算出縱波和橫波通過結(jié)構(gòu)面的耗時,而后利用數(shù)值計算進行反分析,通過不斷調(diào)整結(jié)構(gòu)面的法向和切向接觸剛度,實現(xiàn)與現(xiàn)場實測相同的耗時,從而獲得該結(jié)構(gòu)面的法向和切向接觸剛度特性。對該測試方法的可行性進行了理論、數(shù)值方面的論證,結(jié)果表明縱波過縫耗時僅受法向接觸剛度控制,橫波過縫耗時僅受切向接觸剛度控制,并存在一一對應(yīng)的關(guān)系。而后,通過對花崗巖巖塊的試驗及數(shù)值分析,證明了通過錘擊試驗快速測試巖體結(jié)構(gòu)面接觸剛度的方法是可行的,且具有較好的穩(wěn)定性。
[Abstract]:Based on the linear contact hypothesis of the structure plane, a method for obtaining the contact stiffness of the structural plane by hammering test and numerical inversion is proposed. When the method is implemented, a number of vibration sensors are arranged on both sides of the structural plane respectively, and the excitation hammer is used to excite the vibration in the distance. Through the take-off time of the vibration sensors perpendicular to the direction of the structural plane and parallel to the direction of the structural plane on both sides of the structural plane, The time consuming of the longitudinal wave and the shear wave passing through the structure surface is calculated, and then the numerical calculation is used to carry out the inverse analysis. By constantly adjusting the normal and tangential contact stiffness of the structural plane, the time consuming is the same as that of the field measurement. The normal and tangential contact stiffness characteristics of the structure surface are obtained. The feasibility of this testing method is theoretically and numerically demonstrated. The results show that the time consuming of longitudinal wave seams is only controlled by normal contact stiffness, and the time spent by shear wave seams is only controlled by tangential contact stiffness, and there is a one-to-one correspondence relationship. Then, through the test and numerical analysis of granite block, it is proved that the method of quick measuring contact stiffness of rock mass structural plane by hammer test is feasible and has good stability.
【作者單位】： 中國科學(xué)院力學(xué)研究所流固耦合系統(tǒng)力學(xué)重點室驗室;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃項目(2015CB250903) 中國科學(xué)院戰(zhàn)略性先導(dǎo)科技專項B類項目(XDB10030303)
【分類號】：TU45

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