摘要
考虑斜井倾斜角对冻结壁荷载的影响,通过坐标变换获得了沿环向非均匀分布的法向荷载qr、环向剪切qrθ和轴向剪切荷载qrz3类斜井冻结壁边界荷载的分布表达式.考虑了深埋和浅埋情况,通过在平面非轴对称弹性问题中引入冻结壁整体受力平衡条件,建立了更符合实际的斜井冻结壁特殊荷载分布的力学模型,推导出弹性应力解;基于Mises屈服准则,以最大塑性区半径Rmax=0.8a＋0.2b为控制条件,给出了斜井冻结壁厚度的迭代计算方法.实例分析表明,在工程常见的井轴倾角α=10°~30°范围内,深、浅埋情况下冻结壁计算厚度随井轴倾角增大分别减小了21.6%和22.4%.浅埋情况下的斜井冻结壁厚度随埋深z增加近似线性增加,然而深埋情况下的斜井冻结壁厚度与自然拱高度h1相关,与埋深z无关.
Considering the influence of shaft inclination on the loading of frozen wall, three types of distribution expressions on the boundary load of frozen shaft wall （FSW） namely cir- cular non-uniform loading qr, circular shear loading qrθ and axial shear loading qn were obtained through coordinate transformation. Based on the special load distribution characteristics of in- cline frozen shaft wall, deep-buried and shallow-buried conditions were taken into consideration respectively. The solution to elastic stress was derived by introducing load equilibrium condi- tion of the whole FSW in non-axisymmetric plane elasticity problem and setting up a more rational mechanical model. On the basis of Mises yield criterion and taking the radius of maxi- mum plastic zone Rmax=O. 8a＋0. 2b as a control condition, an iterative method to calculate the thickness of FSW was presented. The calculation analysis showed that within the scope of shaft inclination a： 10°-30°which is commonly seen in engineering, the thickness of frozen wall decreases by 21.6% and 22.4% with the increase of shaft inclination under deep-buried condition and shallow-buried condition respectively. The thickness of frozen shaft wall under shallow-buried condition almost increases linearly with the increase of buried depth z. The thickness of FSW is approximately linearly increasing with the buried depth z in the shallow- buried condition whereas it is correlated with the slumping arch height and independent of bur-led depth z in the deep-buried condition.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2016年第3期514-520,共7页
Journal of China University of Mining & Technology
基金
国家高技术研究发展计划(863)项目(2012AA06A401)
国家高等学校学科创新引智计划(111)项目(B14021)
关键词
斜井冻结
冻结壁厚度
弹塑性分析
设计理论
frozen inclined shaft
frozen-soil-wall thickness
elastic-plastic analysis
designtheory
