| 拉伸条件下锚杆对含表面裂隙类岩石试样加固效应试验研究 |
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| 引用本文： | 张宁,李术才,吕爱钟,李明田,沈锋,邵冬亮. 拉伸条件下锚杆对含表面裂隙类岩石试样加固效应试验研究[J]. 岩土工程学报, 2011, 33(5): 769 |
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| 作者姓名： | 张宁 李术才 吕爱钟 李明田 沈锋 邵冬亮 |
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| 作者单位： | 1. 华北电力大学水电与岩土工程研究所，北京 102206；2. 山东大学岩土与结构工程研究中心，山东 济南 250061 |
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| 基金项目： | 国家自然科学基金项目(50874047,40902083); 国家杰出青年科学基金(A类)项目(50625927) |
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| 摘 要： | 选用改性橡胶粉–水泥砂浆来模拟真实岩石，用玻璃纤维增强塑料作为锚杆材料，研究锚杆对三维表面裂隙岩体的加固止裂效果。结果表明，锚杆提高了裂隙岩体的变形模量和单轴抗拉强度，变形模量随锚固角的增大而增大，而单轴拉伸随锚固角的增大先增大后减小，当锚固角β=45°时，锚杆对单轴抗拉强度的提高幅度最大；锚杆通过其抗滑移和抗剪切性能使裂隙岩体避免发生脆性破坏，并且在预置裂隙起裂之后存在不同程度的残余强度；单轴拉伸条件下加锚或无锚裂隙试件的破坏均以预置裂纹尖端为突破口产生翼裂纹，其扩展方向大致与轴向拉应力方向垂直。当锚固角小于某个临界值时，会有次生裂纹产生；拉伸条件下，含裂隙试件的破坏机制是张拉型裂纹的贯通作用。
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| 关 键 词： | 单轴拉伸 锚杆 三维表面裂隙 裂隙扩展 加固止裂效应 |
Experimental study on reinforced effect of bolts on 3D surface fractured rock under uniaxial tension |
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| ZHANG Ning,LI Shu-cai,Lü Ai-zhong,LI Ming-tian,SHEN Feng,SHAO Dong-liang. Experimental study on reinforced effect of bolts on 3D surface fractured rock under uniaxial tension[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(5): 769 |
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| Authors: | ZHANG Ning LI Shu-cai Lü Ai-zhong LI Ming-tian SHEN Feng SHAO Dong-liang |
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| Affiliation: | 1. Institute of Hydroelectric and Geotechnical Engineering, North China Electric Power University, Beijing 102206, China; 2. Research Center of Geotechnical Engineering, Shandong University, Jinan 250061, China; 3. Department of Civil Engineering, Shandong Jiaotong University, Jinan 250023, China; 4. Nanjing Fenghui Composites Co., Ltd., Nanjing 210004, China; |
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| Abstract: | Modified rubber powder-cement mortar is used to simulate the real rock.Glass fiber reinforced plastics(GFRP) is chosen as the bolt material.The reinforced and crack arresting effect of bolts on 3D surface fractured rock is studied.The experimental results show that the bolts obviously enhance the deformation modulus and uniaxial tensile strength.The deformation modulus increases with the increase of the anchor angles.The uniaxial tensile strength increases firstly,then decreases with the increase of the anc... |
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| Keywords: | uniaxial tension bolt 3D surface fracture crack propagation reinforced effect |
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