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郭屯煤矿主井冻结冲积层厚度为587.5 m,是目前世界上冻结冲积层厚度最大的井筒.凿井过程中,为保证冻结壁和井壁安全,实现安全快速施工,开展了信息化施工技术研究.通过现场实测,获得了凿井过程中上部已成型外层井壁段的温度、受力与变形,掌握了深部冻结井壁的径向荷载、钢筋轴力、混凝土应变的变化规律.在此基础上,评价冻结壁和井壁的安全状况,为凿井过程中的工程决策提供了科学依据.实测成果表明,冻结井筒外层井壁径向荷载受深度、土层特性、冻结情况和井壁结构等因素的影响.本文成果对于深厚冲积层建井工程有重要意义,为探索深部(冻)土的力学特性积累了丰富资料.
The main borehole in Guo Tun Coal Mine has a thickness of 587.5 m, which is the largest wellbore in the world with the highest thickness of frozen alluvium. In the process of sinking, to ensure the safety of frozen walls and shaft walls and to achieve safe and rapid construction, informatization construction technology The temperature, force and deformation of the well wall in the upper part of the shaft during the shaft sinking were obtained by field measurement, and the variation of the radial load, the axial force and the strain of the concrete shaft in the deep freezing shaft was obtained. On this basis, evaluating the safety of the frozen wall and the shaft wall provides a scientific basis for engineering decision-making during the shaft sinking.The measured results show that the radial borehole wall of the frozen well borehole is affected by the depth, soil properties, freezing and Borehole structure and other factors.The results of this paper are of great significance to deep alluvium build-up project, and accumulated rich information for exploring the mechanical properties of deep (frozen) soils.