期刊论文

Jiang, X.-L.(iamjxl@tom.com)

中文

中南大学学报(自然科学版)

1672-7207

2012

43

9

3659-3664

国家自然科学基金资助项目（51204215）； 湖南省教育厅青年项目（11B133）； 住房与城乡建设部科技计划项目（2011-k3-15）； 中南林业科技大学2010年***项目（104-155,104-156）；

本校为其他机构

将岩石视为理想弹塑性介质,采用梁柱理论分析岩石本构关系对改进梁模型的影响,将模型的受力状态简化为弹性状态、拉伸屈服或压缩屈服状态、拉压屈服并存状态,并分别得到不同受力状态下的广义弯矩-轴力-曲率关系。假设模型的挠曲线为正弦半波函数,得到了模型最大承载力的弯矩-轴力-横向荷载相关方程(m _0-n-q);采用裂隙张量与损伤理论,得到了等效弹性模量与初始弹性模量之间的关系。以瓮福磷矿穿岩矿段地下空区顶板为例计算得到不同跨厚比(L/h=3,5,8)条件下横向荷载与轴力的相关曲线。研究结果表明:在横向荷载q一定的情况下,随着顶板跨度与厚度的比值(L/h)的减小,轴向力(n=N/N_y)增加;在轴向力一...

The rock was regarded as perfectly elasto-plastic material, the effect of rock's constitutive relation on the improved beam was analyzed with beam-column theory, the forced state of model was simplified as elastic state, tensile yield state, compressive yield and coexistence state of tensile and compressive yield. The relationships of moment-axial force-curvature were obtained. The deflection curve was assumed as the sine half wave and the equation of the generalized moment-axial force-lateral load of model was built. The relationship between equivalent modulus and initial modulus was gotten f...