采空区群动力响应的类层间剪切模型法研究
发布时间：2018-11-06 12:33
【摘要】：为研究采空区群内岩体介质动力响应特性,提出采空区群动力响应的类层间剪切模型法。通过将上覆岩层等效为由"虚拟间柱群"和集中质量块组成的系统,将周边围岩等效为剪切力Q的作用,构建采空区群类层间剪切模型,建立采空区群内岩体介质的动力响应微分方程;考虑到单元空区的赋存深度和构成形状特征,引入剪切力影响因子δ,修正围岩的剪切力作用。以某金矿5个中段采空区组成的采空区群为例,利用数值分析法与该分析方法进行对比分析。结果表明:上述采空区群赋存环境的等效方法具有可行性;采空区群岩体在其内部阻尼及外部围岩剪切力的双重作用下,作振幅衰减振动;类层间剪切模型法和数值分析法计算记录点的位移、速度时程曲线趋势一致、幅值相近,但前者运算时间更短、效率更高。类层间剪切模型法为研究采空区群动力响应特性提供了一种新思路。
[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.
【作者单位】： 华南理工大学土木与交通学院;华南理工大学安全科学与工程研究所;北京科技大学土木与环境工程学院;
【基金】：国家自然科学基金资助项目(51174092,51574013) “十二五”国家科技支撑计划项目(2012BAB08B02)
【分类号】：TD325.3
，
本文编号：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.
【作者单位】： 华南理工大学土木与交通学院;华南理工大学安全科学与工程研究所;北京科技大学土木与环境工程学院;
【基金】：国家自然科学基金资助项目(51174092,51574013) “十二五”国家科技支撑计划项目(2012BAB08B02)
【分类号】：TD325.3
，
本文编号：2314271
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