采空區(qū)群動力響應的類層間剪切模型法研究
發(fā)布時間：2018-11-06 12:33
【摘要】：為研究采空區(qū)群內(nèi)巖體介質(zhì)動力響應特性,提出采空區(qū)群動力響應的類層間剪切模型法。通過將上覆巖層等效為由"虛擬間柱群"和集中質(zhì)量塊組成的系統(tǒng),將周邊圍巖等效為剪切力Q的作用,構(gòu)建采空區(qū)群類層間剪切模型,建立采空區(qū)群內(nèi)巖體介質(zhì)的動力響應微分方程;考慮到單元空區(qū)的賦存深度和構(gòu)成形狀特征,引入剪切力影響因子δ,修正圍巖的剪切力作用。以某金礦5個中段采空區(qū)組成的采空區(qū)群為例,利用數(shù)值分析法與該分析方法進行對比分析。結(jié)果表明:上述采空區(qū)群賦存環(huán)境的等效方法具有可行性;采空區(qū)群巖體在其內(nèi)部阻尼及外部圍巖剪切力的雙重作用下,作振幅衰減振動;類層間剪切模型法和數(shù)值分析法計算記錄點的位移、速度時程曲線趨勢一致、幅值相近,但前者運算時間更短、效率更高。類層間剪切模型法為研究采空區(qū)群動力響應特性提供了一種新思路。
[Abstract]:In order to study the dynamic response characteristics of rock mass in goaf group, an interlaminar shear model method for dynamic response of goaf group is proposed. By taking the overlying strata as a system composed of "virtual intercolumn group" and concentrated mass block, the surrounding rock is equivalent to the shear force Q, and the interlaminar shear model of the goaf group is constructed. The differential equation of dynamic response of rock mass media in goaf group is established. Taking into account the occurrence depth and shape characteristics of the unit voids, the shear force influence factor 未 is introduced to modify the shear force action of surrounding rock. Taking the goaf group composed of five mined-out areas in a gold mine as an example, the numerical analysis method and the analysis method are compared and analyzed. The results show that the equivalent method for the occurrence environment of the goaf group is feasible, and the amplitude attenuation vibration of the rock mass in the goaf group is made under the dual action of its internal damping and the shear force of the surrounding rock. The displacement of the recording point is calculated by the interlaminar shear model method and the numerical analysis method. The velocity and time history curve trend is the same and the amplitude is similar, but the former has shorter operation time and higher efficiency. The method of interlaminar shear model provides a new way to study the dynamic response of goaf groups.
【作者單位】： 華南理工大學土木與交通學院;華南理工大學安全科學與工程研究所;北京科技大學土木與環(huán)境工程學院;
【基金】：國家自然科學基金資助項目(51174092,51574013) “十二五”國家科技支撐計劃項目(2012BAB08B02)
【分類號】：TD325.3
，
本文編號：2314271
[Abstract]:In order to study the dynamic response characteristics of rock mass in goaf group, an interlaminar shear model method for dynamic response of goaf group is proposed. By taking the overlying strata as a system composed of "virtual intercolumn group" and concentrated mass block, the surrounding rock is equivalent to the shear force Q, and the interlaminar shear model of the goaf group is constructed. The differential equation of dynamic response of rock mass media in goaf group is established. Taking into account the occurrence depth and shape characteristics of the unit voids, the shear force influence factor 未 is introduced to modify the shear force action of surrounding rock. Taking the goaf group composed of five mined-out areas in a gold mine as an example, the numerical analysis method and the analysis method are compared and analyzed. The results show that the equivalent method for the occurrence environment of the goaf group is feasible, and the amplitude attenuation vibration of the rock mass in the goaf group is made under the dual action of its internal damping and the shear force of the surrounding rock. The displacement of the recording point is calculated by the interlaminar shear model method and the numerical analysis method. The velocity and time history curve trend is the same and the amplitude is similar, but the former has shorter operation time and higher efficiency. The method of interlaminar shear model provides a new way to study the dynamic response of goaf groups.
【作者單位】： 華南理工大學土木與交通學院;華南理工大學安全科學與工程研究所;北京科技大學土木與環(huán)境工程學院;
【基金】：國家自然科學基金資助項目(51174092,51574013) “十二五”國家科技支撐計劃項目(2012BAB08B02)
【分類號】：TD325.3
，
本文編號：2314271
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