深厚表土层非均质冻结壁黏弹性分析  

Viscoelastic analysis of heterogeneous frozen wall in deep alluvium

作　　者：钟贵荣[1] 周国庆[1] 王建州[1] 商翔宇[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008

出　　处：《煤炭学报》2010年第3期397-401,共5页Journal of China Coal Society

基　　金：国家自然科学基金重点资助项目(50534040);国家科技支持计划重点资助项目(2006BAB16B01)

摘　　要：建立了符合深厚表土层多圈管冻结凿井的非均质冻结壁力学模型。基于黏弹性理论和Newton-Cotes数值积分法,推导了非均质冻结壁应力场和位移半解析表达式,并对非均质和均质冻结壁进行验算。结果表明,非均质和均质冻结壁径向应力分布规律基本一致,径向应力绝对值由内到外非线性增加;均质冻结壁环向应力绝对值由内到外非线性减小,非均质冻结壁环向应力在内外圈冻结管圈径处会形成明显突变点;非均质和均质冻结壁径向位移由内到外均非线性衰减;井帮径向蠕变位移速率随时间增加呈先快后慢趋势,并逐渐趋于稳定;同一时刻相同位置处,非均质冻结壁径向蠕变位移比均质冻结壁大。A new mechanical model of heterogeneous frozen wall was created which accords with freezing sinking with several circles of freezing pipes in deep alluvium.Based on viscoelastic theory and numerical integration method of Newton-Cotes,the stresses and displacement semi-analytical formulae of heterogeneous frozen wall were derived.Heterogeneous and homogeneous frozen wall were calculated.The checking calculation results show that the radial stress of heterogeneity and homogeneous forzen wall have the same distribution pattern,the absolute value of radial stress increases nonlinearly from inside to outside.The absolute value of circumferential stress of homogeneous forzen wall decreases nonlinearly from the inside to outside,but the circumferential stress of heterogeneous wall form two mutation points at the inner and external frozen pipe circle position.Both the heterogeneity frozen wall radial displacement and the homogeneous forzen wall radial displacement decrease nonlinearly from inside to outside.The radial creep displacement rate of frozen wall increases quickly during the early stage,and it gradually turns to be stable with the time.At the same position,the radial creep displacement of heterogeneous frozen wall is greater than homogeneous frozen wall at the same time.

关 键 词：深厚表土层 非均质冻结壁 黏弹性 数值积分法 

分 类 号：TD265.34[矿业工程—矿井建设]