锚索受拉与反转扭矩耦合效应及诱致锚固段失效承载机制分析

For cable anchoring theory lags the practice at present, aiming at the mechanics transfer mechanism of anchor cable and the composite bearing capacity effect of the the anchoring section, it is of important theoretical and practical value to research on the constitutive relation and bearing performance of the pulled cable under torque decoupling condition by using the methods such as theoretical analysis, laboratory experiments, numerical simulation and site monitoring. .The main contents are as follows: Firstly, through the experimental research on the axial and transverse cross-sectional deformation characteristics and failure process the of cable, the coupling effect between the axial pull and torque and anchoring system failure mechanism were revealed under different conditions. Secondly, for the structural characteristics of cable itself and the complexity of anchoring engineering rock, considering the unwinding torque due to cable axial being pulled, the damage evolution process of the anchoring system under torque decoupling condition was analyzed and the reasonable constitutive relation of the anchoring system was put forward. Thirdly, based on experimental data and theoretical analysis, the new method of dynamic feedback design and anchoring system optimization of cable under different working conditions was put forward. Fourthly, the security evaluation system including the engineering mechanics model, anchor bearing capacity and mechanical transfer characteristic evaluation, and anchoring system failure prediction function was built. .All these above mentioned were to enrich and develop the existing cable anchoring theory, and to provide theoretical basis and technical support for the engineering practice.

针对锚索拉拔时耦合传力及锚固段失效机制研究滞后工程需求的现状，采用室内外试验、理论分析和数值模拟等综合研究方法，进行锚索受拉与反转扭矩耦合效应及诱致锚固段失效承载机制分析，具有重要理论意义和实用价值。.主要研究内容：(1) 通过室内外锚索轴向及横向截面变形特性试验研究以及锚索锚固系统失效过程分析，揭示锚索轴向受拉与转矩间耦合效应以及锚索锚固系统失效机制。(2) 针对锚索自身结构特性与锚固工程岩体复杂性，考虑锚索受拉时由于反向解旋产生的扭矩作用，进行扭矩解耦条件下锚固界面损伤演化过程解析分析，提出锚索锚固界面合理本构关系。(3) 基于试验数据和理论分析，提出不同工况条件下锚索锚固系统优化和动态反馈设计新方法。(4) 构建包含锚索锚固工程力学模型、锚索承载与力学传递特性评估和锚固体系失效预测等功能集成的安全评判系统。.项目研究以期丰富和发展锚索锚固基础理论，为现场实践提供理论依据和技术支撑。

针对锚索拉拔时耦合传力及锚固段失效机制研究滞后工程需求的现状，采用室内外试验、理论分析和数值模拟等综合研究方法，进行锚索受拉与反转扭矩耦合效应及诱致锚固段失效承载机制分析，取得的主要研究成果如下：.① 自主研发了实现扭矩与轴力解耦的锚索拉拔试验平台以及实现拉扭耦合锚索拉拔试验的系列配套装置，应用效果良好，为保障本项目的顺利实施提供了良好的硬件支撑平台和设备。② 基于锚索拉拔试验，揭示了锚索拉拔-扭转耦合力学效应以及锚索锚固系统失效机制。提出了考虑拉力与反转扭矩解耦的锚索拉力公式。揭示了轴向拉力-位移关系、扭矩-位移和扭矩-轴向拉力关系，提出了锚索锚固界面合理本构关系和锚索锚固系统优化设计新方法，进行了锚索锚固体系失效预测风险分析。③ 对锚索与锚杆(钢筋)锚固力学效应及测试技术进行了系统研究，揭示了锚固钢筋拉拔及受剪过程力学特性，结合现场试验，完成了锚杆低应变动力无损检测试验及测试验证分析。④ 构建了轻质混凝土材料的本构关系，揭示了裂纹扩展机理和率相关加载条件的损伤演化规律。揭示了工程岩体的尺度效应及工程扰动围压压力演化特征。.项目研究丰富和发展了锚索锚固基础理论，为现场实践提供了理论依据和技术支撑，研究成果具有推广应用价值。