TESTING RESEARCH ON THE STRUCTURAL CHARACTERISTICS OF A TYPE OF STEEL STRUCTURE OF COMPRESSIBLE LINING JOINT FOR SHAFTS
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摘要: 为防止钻井工法施工的立井衬砌受地层失水沉降引起的竖向负摩擦力作用而发生破坏,在立井衬砌的局部设置一种带环形立板和径向肋板的竖向可缩接头。为了解该装置的基本性能,对其结构模型进行了单轴受力、三轴受力状态的模型试验和水平侧向压力条件下的模型试验研究;全面探索这种可缩性钻井井壁接头的竖向可缩能力、竖向临界承载力、接头结构内部的相互制约作用以及可缩接头参数与上下井壁设计强度之关系;证明了这种井壁接头具有释放井壁竖向应力,抗侧向压力的作用和良好的防水能力,能起到防止钻井井壁破坏的作用,也对该类井壁接头的设计计算和参数取值提出了建议。Abstract: According to the fracture mechanism of the linings acted on by negative friction in a drilled shaft, a type of compressible lining joint installation, with a ring plate adding to rib plates, is presented. The physical simulation tests of this installation were finished under uniaxial and triaxial compression. The compressing characteristics, the vertical critical load, and the acting behavior between ring plate and rib plates were investigated. The test results prove that this kind of installation is of good waterproofing, and can unload vertical stress in shaft linings and then prevent the shaft lining fracture. Some opinions on the design methods and the values of parameters of this compressible joint are also put forward.
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Key words:
- lining in drilled shafts /
- steel structure /
- compressible joint /
- model test /
- critical load
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[2] 孙文若, 杨俊杰.特殊地层条件下井壁破坏的防治技术综述.见:矿井建设技术论文集.重庆:重庆大学出版社, 1997 杨维好, 崔广心, 等.特殊地层条件下井壁破坏机理及防治技术研究.中国矿业大学学报, 1996(4) [3] 吕恒林, 等.可缩钻井井壁设计理论研究.东北煤炭技术, 1997(4):7~10 [4] 徐挺.相似理论与模型试验.北京:中国农机出版社, 1982.127~138
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