摘要
本文在介绍国内首次研究成功的冻结壁三轴流变试验台上所做的8次大型模拟试验的基础上,分析了冻结壁流变变形与其平均温度、掘进直径、壁厚、暴露段高、地压以及土质等参数的关系。试验获得以下主要结论: 1.流变是冻结壁变形的主要特征,冻结壁设计应按变形极限设计; 2.提高冻结壁强度,减小其变形,主要在于降低温度,增大壁厚; 3.工作面有底臌是造成冻结壁超前位移,加大冻结壁变形的表现; 4.交界处不同土层因温度与形成的厚度有差异,变形也不同,从而导致此处冻结管承受附加弯矩和剪力,故更易发生断管; 5.实验获得了冻结壁变形位移与各参数间的函数式,并为淮南谢桥矿已施工的三个井筒所证实,可作为冻结壁设计的主要参考依据。
A detailed account is given of 8 large-scale simulations of the ice wall in a triaxial creep test rig, the first of its kind in our country. Analysis is made of the dependence of creep deformation of ice wall on such parameters as average temperature, excavated diameter, wall thickness, height of unsupported wall, ground pressure, soil condition, etc. Conclusions obtained are as follows:
1. Ice wall should be designed based on the maximum creep because it is the principal character of ice wall deformation.
2. The ice wall can be strengtnened and deformation lessened by lowering temperature and thickening the ice wall;
3. Heaving in workface is a sign of advance displacement and increased deformation of the ice wall;
4. Freezing pipes are liable to rupture due to additional torque and shear produced by differential deformation resulted from difference of temperature and thickness of ice wall at the interfaces of layers of soil;
5. A functional equation, describing relations between deformation displacement of ice wall and all the parameters, which has been verified at three shafts at Xieqiao mine of Huainan, can be used as a major criterion for the design of ice wall.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
1991年第2期53-62,共10页
Journal of China Coal Society
关键词
凿井
井壁
施工
冻结法
变形
模拟
ice wall
creep deformation
heaving
simulation tests
