| 顺层岩质边坡锚杆拉剪作用力学性能 |
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| 引用本文： | 张爱社,祝介旺,高翠兰,李文乐,侯海波,曹照法.顺层岩质边坡锚杆拉剪作用力学性能[J].地球科学,2022,47(12):4574-4582. |
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| 作者姓名： | 张爱社 祝介旺 高翠兰 李文乐 侯海波 曹照法 |
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| 作者单位： | 1.山东建筑大学土木工程学院, 山东济南 250101 |
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| 基金项目： | 国家重点研发计划”强震区滑坡崩塌灾害防治技术方法研究”2019YFC1509703 |
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| 摘 要： | 锚杆能够显著增强顺层岩质边坡的稳定性.基于顺层边坡结构效应，应用锚杆加固顺层边坡的力学模型，根据结构力学理论和变形协调关系，建立拉剪作用下全长粘结型锚杆加固顺层边坡抗剪计算的理论分析方法.与相关试验数据进行了比较验证，结果表明顺层边坡锚固抗力模型计算结果与试验结果比较一致，验证了理论模型的合理性.讨论了锚杆倾角、锚杆直径、灌浆体强度、结构面内摩擦角、剪胀角等对加锚顺层岩体抗剪性能的影响.分析表明:锚杆锚固抗力模型能够较好地反映锚杆轴力及横向剪切力对顺层岩质边坡的抗剪作用.锚杆倾角越大，锚杆总的抗力呈减小趋势，而锚杆抗力随剪胀角增大而增加；当锚杆倾角等于内摩擦角时，锚杆抗力达到最大；锚杆抗力随锚杆直径增加而增大；当锚杆直径不变时，锚杆抗力随灌浆体抗压强度增大而有所减小.
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| 关 键 词： | 顺层边坡 全长粘结型锚杆 锚杆锚固 拉剪作用 抗剪承载力 岩土工程 |
| 收稿时间： | 2022-06-25 |
Mechanical Analysis of Rock Bolts under Action of Tension and Shearing in Bedding Rock Slopes |
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| Abstract: | Bolting is one of the important methods to harness the bedding rock slopes. The stability of the rock can be strengthened by rock bolts. The mechanical model of bolted bedding rock slope is employed to analyses the behavior of the rock bolt. The force method approach and the deformation compatibility principles are used to model the contribution of the axial and shear bolt forces at the intersection between the bolt and the joint plane. The theoretical analyses of the shearing resistance for the fully grouted rock bolts in the bedding rock slope are evaluated in the action of axial and shear loads. Comparisons and validations were carried out between the shearing resistance mechanical model predictions and the experimental data. It is shown that the data of the both methods have a good agreement. The effects of bolt inclination, the length of shearing deformation, bolt diameter, the grout compressive strength, and the internal friction angle of the joint plane on the shear strength of the bolted bedding rocks are investigated in detail. The results show that the bolt shearing resistance model expresses the contribution of the axial force and shearing force of the bolts to the shear strength of the bedding rock slopes. The total resistance is reduced with the larger of the bolt inclination. With increasing of the dilation angle, the rock bolt resisting force increases. When the inclination of rock bolt equals to the friction angle, the bolt contribution to resist the rock movement is the maximum value.The greater the diameter of the bolts, the larger the bolt resistance. The resistance of the rock bolt will have a little reduction with the increasing of the grout compressive strength for a certain diameter of the bolt. |
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