采矿与安全工程学报2016，Vol.33Issue(3)：486-493,507,9.DOI:10.13545/j.cnki.jmse.2016.03.017
卸载条件下二向不均等地应力场中圆形冻结壁弹性应力分析
Elastic stress analysis on circular frozen wall in bi-directional unequal ground stress field under unloading condition
摘要
Abstract
To obtain the stress and deformation of circular frozen wall in bi-directional unequal ground stress field, an elastic mechanical model of frozen wall interacting with surrounding rock has been es-tablished with the excavation unloading considered. The analytical solution has been derived and veri-fied by finite element software,which has also been compared with the traditional loading model. The hoop stress and radial displacement distributions in the inner edge of frozen wall have been analyzed emphatically as well as their relationship with different influencing factors. The results have shown that the calculation results of the loading model are overall larger than the unloading model. When the elas-tic modulus ratio β between frozen wall and surrounding rock has a small value, the consideration of their interaction can decrease the stress and displacement effectively. If the ground stress uniformity co-efficient λ is small enough, the tensile hoop stress will appear in the inner edge of frozen wall, which is not conducive to the full play of its carrying capacity. In addition, unloading rate, β, λ, and frozen wall’s radius ratio all have significant impact on the stress and displacement of frozen wall, while the influence of the Poisson’s ratio is relatively small. On the whole, the calculation model in this paper can really re-flect the stress and deformation of frozen wall, and the research findings can guide the frozen wall’s de-sign and construction.关键词
地应力场/冻结壁/围岩/卸载/弹性分析Key words
ground stress field/frozen wall/surrounding rock/unloading/elastic analysis分类
矿业与冶金引用本文复制引用
王勇,杨维好..卸载条件下二向不均等地应力场中圆形冻结壁弹性应力分析[J].采矿与安全工程学报,2016,33(3):486-493,507,9.基金项目
国家高技术研究发展计划(863)项目(2012AA06A401)；国家自然科学基金项目(41501075) （863）
