| Hoek-Brown准则下预应力锚索锚固体破坏的极限分析 |
| |
| 引用本文： | 李术才,王洪涛,王 琦,等.Hoek-Brown准则下预应力锚索锚固体破坏的极限分析[J].岩土力学,2014,299(2):466-473. |
| |
| 作者姓名： | 李术才 王洪涛 王 琦 等 |
| |
| 作者单位： | 1.山东大学 岩土与结构工程研究中心，济南 250061；2.兖矿集团有限公司 博士后科研工作站，山东 邹城 273500 |
| |
| 基金项目： | 国家自然科学基金青年科学基金项目（No. 51304125，No. 41102184）；高等学校博士学科点专项科研基金（No. 20130131120090）；山东省优秀中青年科学家科研奖励基金（No. BS2013NJ004，No. 2012M511028） |
| |
| 摘 要： | 针对预应力锚索锚固体的破坏形式,采用Hoek-Brown强度准则及其相关联的流动法则,分别考虑锚固体界面产生滑脱破坏与锚固体周围岩体发生整体破坏两种工况,根据塑性力学中的上限分析定理,推导出了锚索极限抗拔力的计算公式与锚固体的破裂机制,并分别讨论了锚固段灌浆压力、锚固段长度与岩体强度参数等对极限抗拔力与破裂面形状的影响。计算表明:一定范围内增大锚固段长度和采用压力灌浆是提高锚索极限抗拔力的有效措施;当锚固段周围岩体发生整体破坏时,随着岩体经验参数A、岩体抗拉强度、抗压强度与重度的增加,锚索极限抗拔力不断增大,而随着经验参数B的增加,锚索极限抗拔力则不断减小;锚固段周围岩体破裂面形状呈现出对称的"喇叭形",这与现有文献中的研究成果相一致,而且岩体经验参数B是影响岩体破裂面形状的重要因素,它决定了岩体破裂面的曲率大小,当B=1时,岩体破裂曲面退化为圆锥面。
|
| 关 键 词： | 预应力锚索 Hoek-Brown强度准则 塑性 流动法则 锚固体 极限分析 |
| 收稿时间： | 2012-12-11 |
Limit analysis of failure mechanism of prestressed anchor cable based on Hoek-Brown failure criterion |
| |
| LI Shu-cai,WANG Hong-tao,WANG Qi,WANG De-chao.Limit analysis of failure mechanism of prestressed anchor cable based on Hoek-Brown failure criterion[J].Rock and Soil Mechanics,2014,299(2):466-473. |
| |
| Authors: | LI Shu-cai WANG Hong-tao WANG Qi WANG De-chao |
| |
| Institution: | 1. Research Center of Geotechnical and Structural Engineering，Shandong University, Jinan 250061, China; 2. Post-Doctoral Scientific Research Station, Yankuang Group Company Limited, Zoucheng, Shandong 273500, China |
| |
| Abstract: | Focused on the failure modes of prestressed anchor cables, according to Hoek-Brown failure criterion and associated flow rule, the ultimate pullout force and failure mechanism of anchor cable were deduced through upper bound limit analysis, where bond failure of anchorage body and anchored rock mass failure were considered respectively. The influences of grouting pressures, lengths of anchorage section and rock parameters on ultimate pullout forces and failure mechanisms were analyzed. The results reveal that, increasing anchorage length in a certain extent and using pressure grouting are effective measures to improve ultimate pullout forces of anchor cables. When anchored rock mass failure occurs, ultimate pullout forces will increase with the improving of empirical parameter A, tensile strength, compressive strength and unit weight of rock mass, while it will decrease with the improving of empirical parameter B. The shape of failure surface of anchored rock mass looks like horn, which is consistent with the conclusions of existing literatures; and parameter B is a key factor affecting the shape of failure surface of rock mass; it determines the curvature of failure curved surface; and curved surface will degenerate into circular conical surface when B is equal to 1. |
| |
| Keywords: | prestressed anchor cable Hoek-Brown failure criterion plasticity flow rule anchorage body limit analysis |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
