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冻结凿井中冻结壁的弹塑性分析
ANALYSIS OF ELASTO-PLASTICITY OF FROZEN WALL IN SHAFT SINKING
【摘要】 本文在试验基础上,根据库仑-莫尔塑性条件,研究了弹塑性冻结壁的承载性能,着重分析了在外载增长情况丁不同厚度冻结壁的塑性区扩展状况。对冻结壁几何尺寸、塑性区扩展半径、井壁抗力与外载之间的相关关系进行了探索,并找出了塑性区的合理扩展范围. 在此基础上,本文应用逐步回归分析,通过电算进行曲线拟合,获得了冻结壁厚度的简易计算公式:E=a(-1.21+0.54 lnP’). 最后,讨论了公式的安全系数问题。
【Abstract】 Based on field test results, the author investigates the loading characteristic of the elasto-plastic frozen wall according to Mohr-Coulomb plastic condition. Emphasis are given on analysis of the development of the plastic region in the frozen wall with various thickness under increasing load. The relationship between the load and the dimensions of frozen wall, the radius of the plastic region and the reaction of the shaft lining are discussed. The rational extent of the plastic region is found.A simple formula E=α(-1.21+0.54 1nP’) has been derived to calculate the thickness of frozen wall applying the stepwise regression analysis and the curve fitting by computer.Finally safety factor in the formula has been discussed.
- 【文献出处】 煤炭学报 ,Journl of China Coal Society , 编辑部邮箱 ,1980年02期
- 【被引频次】12
- 【下载频次】104