【摘要】：危巖塊體的失穩(wěn)多表現(xiàn)為突發(fā)崩塌破壞,無明顯位移特征,因此常規(guī)位移監(jiān)測難以達到監(jiān)測預(yù)警的目的,此外影響危巖塊體穩(wěn)定性重要參數(shù)之一的危巖塊體與母巖粘結(jié)面積難以獲得,導(dǎo)致危巖塊體穩(wěn)定性評價困難。本文以危巖塊體為研究對象,假設(shè)危巖塊體均質(zhì)各向同性,主控結(jié)構(gòu)面為單個平面,系統(tǒng)阻尼比小于1,在振幅范圍內(nèi)的變形為線彈性變形,則可將危巖塊體振動模型簡化為彈簧振子模型。通過理論推導(dǎo)建立了危巖塊體固有振動頻率、危巖塊體與母巖粘結(jié)面積、彈性模量和危巖塊體質(zhì)量之間的關(guān)系,再結(jié)合極限平衡模型,建立了基于固有振動頻率的危巖塊體穩(wěn)定性評價模型。以白河堡水庫右岸的危巖塊體為試驗對象,利用無線振動傳感器(微芯方),將采集到的數(shù)據(jù)采用傅里葉變換等數(shù)學(xué)方法得到危巖塊體固有振動頻率,再結(jié)合固有振動頻率與危巖塊體粘結(jié)面積、彈性模量、危巖塊體質(zhì)量之間的關(guān)系,計算出塊體粘結(jié)面積,最后基于該模型完成危巖塊體穩(wěn)定性評價。試驗驗證了基于固有振動頻率的危巖塊體穩(wěn)定性評價可行性,相比傳統(tǒng)方法更加快捷、準(zhǔn)確。
[Abstract]:The instability of dangerous rock block is mostly caused by sudden collapse and failure without obvious displacement characteristics, so it is difficult to achieve the purpose of monitoring and early warning by conventional displacement monitoring. In addition, it is difficult to obtain the bond area between the dangerous rock block and the parent rock which affects one of the important parameters of the stability of dangerous rock block, which leads to the difficulty of evaluating the stability of dangerous rock block. In this paper, the dangerous rock block is taken as the research object, assuming that the dangerous rock block is homogeneous and isotropic, the main structure plane is a single plane, the damping ratio of the system is less than 1, and the deformation in the amplitude range is linear elastic deformation. Then the vibration model of dangerous rock block can be simplified to spring oscillator model. The relationship between the natural vibration frequency, the bond area between the dangerous rock block and the parent rock, the elastic modulus and the mass of the dangerous rock block is derived theoretically, and then combined with the limit equilibrium model. The stability evaluation model of dangerous rock block based on natural vibration frequency is established. Taking the dangerous rock block on the right bank of Baihebao Reservoir as the test object, using the wireless vibration sensor (micro-core square), the natural vibration frequency of the dangerous rock mass is obtained by Fourier transform and other mathematical methods. Combined with the relationship between the natural vibration frequency and the bond area, elastic modulus and mass of the dangerous rock block, the block bond area is calculated. Finally, the stability evaluation of the dangerous rock block is completed based on the model. The experimental results show that the stability evaluation of dangerous rock block based on natural vibration frequency is feasible, which is faster and more accurate than the traditional method.
【作者單位】： 北京科技大學(xué)土木與環(huán)境工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項目:基于動力特征參數(shù)的邊坡危巖塊體穩(wěn)定性監(jiān)測評價模型研究(No.41572274)~~
【分類號】：TU457

【相似文獻】

相關(guān)期刊論文 前6條

1 孫強;張忠平;李春旺;喬艷江;趙文軫;;某型航空發(fā)動機銷釘式葉片固有振動頻率的有限元計算[J];應(yīng)用力學(xué)學(xué)報;2006年03期

2 王震鳴,戴涪陵;正交各向異性的多層、夾層和加筋扁殼的彎曲、穩(wěn)定和振動[J];力學(xué)學(xué)報;1983年05期

3 李鵬;聲波共振治癌設(shè)想[J];發(fā)明與創(chuàng)新;2003年04期

4 呂毅寧;呂振華;;焊點連接模型對結(jié)構(gòu)剛度的有限元模擬精度的影響分析[J];工程力學(xué);2009年10期

5 錢星博;;次聲波——世界恐怖地區(qū)的魔鬼殺手[J];小學(xué)科技;2003年05期

6 ;[J];;年期

相關(guān)博士學(xué)位論文 前1條

1 杜巖;基于固有振動頻率的危巖塊體穩(wěn)定評價模型研究[D];北京科技大學(xué);2016年

相關(guān)碩士學(xué)位論文 前1條

1 顧曉龍;脫掛索道線路結(jié)構(gòu)布置優(yōu)化設(shè)計[D];重慶大學(xué);2014年

，

本文編號：2447574