徐  洪^1,2，杨建国^1,2，黄润英^1,2
(1 重庆地质矿产研究院煤炭资源与安全开采国家重点实验室重庆研究中心，重庆400042；2重庆市国土资源和房屋管理局矿产地质与环境地质重点实验室，重庆400042)

[摘要] 从弹性力学理论出发，借鉴地面钢筋混凝土结构中构件锈胀开裂的研究成果，并考虑地下锚固环境受围岩及初始地应力影响的特殊情况，引入围岩初始应力影响系数以及围岩初始应力影响函数两个变量，对锚杆锈蚀导致砂浆保护层开裂的过程进行了分析。研究结果表明围岩初始应力对砂浆保护层的最大开裂半径起着控制作用，当围岩初始应力超过某一临界值时，砂浆内部裂缝会稳定扩展到砂浆外表面，而当围岩初始应力低于这个值时，砂浆内部裂纹最大稳定扩展半径随应力的增加近似按线性关系变化。针对理论结果，采用有限元分析方法对其进行了验证，验证结果表明二者吻合很好。
[关键词] 锚杆锚固体；锈胀开裂；最大稳定扩展半径；锚杆锈蚀率；初始应力

Research on corrosion cracking process of bolt anchorage body consideration of the affection ofinitial ground stress
Xu Hong^1,2, Yang Jianguo^1,2, Huang Runying^1,2
(1 Chongqing Institute of Geology and Mineral Resources Chongqing Research Center of State Key Laboratory of Coal Resources and Safe Mining, Chongqing 400042, China;  2 Key Laboratory of Geology for Mineral Resources & Environment, Chongqing Administration of Land, Resources and Housing, Chongqing 400042, China )

Abstract: Starting from the elastic mechanics theory, using the research results of corrosion cracking on reinforcement concrete structure for reference, and considering the special cases that anchorage body is affected by surrounding rock and the initial ground stress, the influence coefficient and influence function are introduced to analyze the process of that bolt corrosion leading to mortar cover cracking. The research results shows that the max cracking radius of mortar cover is controlled by surrounding initial stress, if surrounding initial stress is greater than a certain value, the cracks in mortar cover can growth to the mortar outer surface stably, and if initial stress is lower than the value, the max cracking radius change linearly with the initial stress. Aiming at The finite element analysis method is used to verify the theory results, the two results fit well.
Keywords: bolt anchorage body; corrosion cracking; max stable cracking radius; bolt corrosion rate, initial stress