| 岩体离层对锚固体荷载影响的弹塑性分析 |
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| 引用本文： | 谷拴成,丁潇.岩体离层对锚固体荷载影响的弹塑性分析[J].岩土力学,2013,34(9):2649-2654. |
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| 作者姓名： | 谷拴成 丁潇 |
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| 作者单位： | 西安科技大学 建筑与土木工程学院，西安 710054 |
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| 摘 要： | 巷道围岩由于变形不协调而产生离层，离层对锚杆产生附加应力。在已有弹性分析的基础上，根据岩层相对移动时拉拔载荷对锚杆的作用机制，建立了离层进一步扩展、锚固体界面进入弹塑性阶段的锚杆受力模型。通过选取二阶段线性函数剪切滑移模型，确定了离层左右两侧的滑移范围，并得出锚固体的应力分布形式。总结出离层作用下锚固体的受力过程一般分为4个阶段：弹性阶段、单侧进入弹塑性阶段、离层两侧均进入弹塑性阶段和一侧全部滑移、另一侧滑移范围增大阶段。通过对不同离层值和离层位置的参数分析得出：在相同离层位置条件下，离层值越大，离层对锚杆产生的附加应力就越大；在相同离层值条件下，弹塑性阶段基本趋势和弹性阶段相同，表现为锚杆中心处应力最小，越靠近边缘离层产生的附加应力越大。
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| 关 键 词： | 离层 离层值 离层位置 锚固体荷载 剪切滑移模型 滑移范围 弹塑性分析 |
| 收稿时间： | 2012-07-16 |
Elastoplastic analysis of effect of bed separation on anchored mass loading in rock mass |
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| GU Shuan-cheng
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DING Xiao.Elastoplastic analysis of effect of bed separation on anchored mass loading in rock mass[J].Rock and Soil Mechanics,2013,34(9):2649-2654. |
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| Authors: | GU Shuan-cheng DING Xiao |
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| Institution: | College of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054,China |
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| Abstract: | Bed separation will cause anchor to generate additional stress, when the deformation of surrounding rock of roadway is uncoordinated. Based on the existing elastic analysis, an elastoplastic mechanical model of the bolt additional stress caused by the further expansion of the bed separation is established. According to the bolt pulling load to the bolt function mechanism during the relative movement of the strata, through the selection of two-stage linear function shear slide model, the sliding range in both left and right sides of the bed separation is determined; and the stress distribution mode of the anchored mass under the bed separation effect is obtained. Loading process of the anchored mass under the bed separation function is general divided into four stages, i.e. elastic stage, one side into elastoplastic stage, both left and right sides into elastoplastic stage and another side sliding larger with one side sliding all. By means of the parameters analysis of different separation values and different separation locations, the analysis finds that under the condition of the same bed separation location, the larger bed separation value, the larger the additional stress occurred from the bolt by the bed separation would be. Under the condition of the same bed separation value, elastoplastic stage basic trend and elastic stage trend are same, which presents as the stress at the center of the bolt would be minimum; the additional stress occurred close to the boundary bed separation would be larger. |
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| Keywords: | bed separation bed separation value bed separation location anchored mass loading shear slide model sliding range elastoplastic analysis |
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