摘要
以粘弹性理论为基础,采用解析的方法,通过拉普拉斯变换,建立了考虑时效性的围岩应力场、位移场数学表达式。利用位移及应力边界条件,导出了高强预应力锚杆支护下的围岩应力场、位移场解析解。工程实践表明,随着巷道的开挖,锚喷支护能有效控制围岩稳定,且支护后围岩的应力场、位移场随时间的变化趋于稳定,理论上验证了解析解的合理性和科学性。
The mathematical expression of wallrock stress field and displacement filed considering time-sensitivity is established based on visco-elastic theory by applying analytical method and Laplace transformation. The analytical solution of the wall rock stress field and displacement field under the highly stressed bolting support is deduced by the displacement and stress boundary conditions. The engineering practice shows that during tunneling, the bolt-shotcreting can effectively control the wallrock stability and the change in the stress field and displacement field of supported wallrock tends to become stable with time, verifying theoretically the rationality and science of the analytical solution.
出处
《金属矿山》
CAS
北大核心
2009年第4期87-90,共4页
Metal Mine
基金
国家自然科学基金重点项目(编号:90510019
40638040)
关键词
高强预应力锚杆
粘弹性理论
拉普拉斯变换
时效性
Highly-prestressed anchor, Viscoelastic theory, Laplace transform, Time-sensitivity
