压力型锚索锚固段荷载传递特征及影响因素研究  

Study on the Load Transfer Characteristics and Influence Factors of Anchorage Segment of Pressure-type Anchor Cable

作　　者：王开彬 刘钦[2] 王洪涛 WANG Kaibin;LIU Qin;WANG Hongtao(Shandong Engineering Consulting Institute,Jinan 250013,Shandong,China;Shandong Gold Group Co.,Ltd.,Jinan 250101,Shandong,China;Shandong Jianzhu University,School of Civil Engineering,Jinan 250101,Shandong,China)

机构地区：[1]山东省工程咨询院,山东济南250013 [2]山东黄金集团有限公司,山东济南250101 [3]山东建筑大学土木工程学院,山东济南250101

出　　处：《黄金科学技术》2024年第1期123-131,共9页Gold Science and Technology

基　　金：国家自然科学基金项目“深部巷道碎裂围岩锚索拉剪失效特效及预应力全锚控制机理”(编号:52374093);中国博士后科学基金项目“弱胶结软弱隧洞围岩喷射混凝土粘结界面弱化失效力学机理研究”(编号:2022M711314);山东省自然科学基金项目“弱胶结软岩—喷射混凝土界面弱化失效的宏细观力学特性研究”(编号:ZR2022ME088);济南市科研带头人工作室项目“软弱地层地下工程围岩灾变预警及主动控制技术”(编号:202333054)联合资助。

摘　　要：为了研究土层压力型锚索锚固段的荷载传递特征及滑脱过程,在理论分析的基础上推导出压力型锚索在外荷载作用下的剪应力和轴力分布规律公式,详细分析了各影响因素对轴向力和剪应力的影响程度。研究结果表明:锚索锚固段的剪应力和轴力分布函数均为幂函数;剪应力和轴力大小及分布范围取决于锚固力,并与锚固体直径、锚固体弹性模量和泊松比、土的压缩模量和泊松比以及锚固体和土间界面的摩擦角有关;预应力锚索锚固段的最大剪应力位置仅与锚固体直径、土体性质、锚固体材料参数和半径有关;锚固体直径的大小对剪应力和轴力均有显著影响;在不同荷载作用下,锚固体界面剪应力的分布形式、范围和峰值位置均相同。现场原位试验结果表明:理论分析结果与工程实践结果吻合性较好。研究结果可为分析土体锚固工程的受力状态及优化设计提供依据。In order to study the load transfer characteristics and the slippage process of anchorage segment of the pressure-type anchor cable in soil strata,the formula of shear stress and axial force distribution of the anchor cable under external load was derived based on theoretical analysis.In addition,the load transfer characteristics was analyzed.The influence degree of soil compressive modulus,anchor diameter,load and Poisson’s ratio on axial force and shear stress were analyzed in detail.The shear stress and axial force in the anchorage segment of the cable has the same distribution function and is all power functions.The shear stress and axial force are the largest near the bearing plate,but far from the bearing plate,the shear stress and axial force gradually decrease to zero.The magnitude and distribution range of the shear stress and axial force in the anchorage segment mainly depend on the anchorage force,and are related to the diameter,elastic modulus and Poisson ratio of anchor body,the compressibility modulus and Poisson ratio of soils,and friction angle of the interface between anchors and soils.In the form of the formula,if the anchorage segment is infinite,the anchoring force P can be infinite in theory.The ultimate anchoring force depends on the strength of the anchors around the bearing plate,the soil and the interface.The position of the maximum shear stress is only related to the soil properties,material parameters and radius of anchorage in anchorage segment of prestressed cable,not related to the magnitude of load.The diameter of anchors also has significant influence on the distribution of shear stress and axial force.With different loads,the distribution form,range and peak position of shear stress is the same,which is independent of load.Under the same conditions,the larger the compressive modulus of soil,the larger of shear stress,and the faster the shear stress decline trendation.The Poisson’s ratio has little effect on the shear stress.When the value of Poisson’s ratio is different,the

关 键 词：锚索 锚固段 荷载传递特征 影响因素 理论分析 数值模拟 岩体工程 

分 类 号：TU473[建筑科学—结构工程]