中文摘要：

从砂浆锚杆锚固体自身的特点出发，借鉴钢筋混凝土结构锈胀开裂研究成果，对锚杆砂浆锈胀开裂过程进行了分析。考虑锚杆锈蚀体积膨胀过程，以填充系数表示砂浆开裂过程中锚杆锈蚀产物的损失，建立了锚杆锈蚀后砂浆内部位移模型，以弹性力学为基础，引入围岩参数影响系数概念，对锚杆锈蚀导致砂浆保护层开裂过程以及围岩参数对开裂过程的影响程度等进行了分析研究，并采用有限元分析方法对其进行了验证。理论分析结果表明，因锚杆锈蚀而导致的砂浆保护层开裂以及裂纹的扩展情况均与围岩特性密切相关，砂浆开裂后裂纹会经历一段稳定扩展过程，裂纹的最大稳定扩展半径随围岩参数影响系数的增加而增大，在合适的围岩参数条件下，裂纹可以一直稳定扩展致整个砂浆保护层外壁。有限元分析结论与理论结果一致。

英文摘要：

Starting from the own characteristics of mortar bolt anchorage body, the research results of reinforcement structures corrosion cracking is used for reference to analysis mortar cracking process caused by bolt corrosion. First, considering the volume expansion process of corroded bolt, the displacement model of mortar inner surface leaded by bolt corrosion is established after the loss of corrosion production is denoted by a filling factor. Second, based on elastic theory, the mortar cracking process is analyzed after the concept of influence coefficient of surrounding rock is introduced in the course of analyzing, and the degree of cracking course affected by surrounding rock parameter is also analyzed; the finite element method is adopted to verify the results. The theoretical result shows that the mortar cracking process is greatly influenced by surrounding rock characteristics; there is a course of stable propagation in mortar after cracking; the max stable propagation radius increases with the rising of surrounding rock influence coefficient, if the coefficient reaches a certain value, cracks can propagate to the mortar outer surface stably. The finite element result is consistent with the theoretical result.