西三江煤矿区冻融竖井井壁破裂机理及防治探讨

In West Coal Mining Area of Three Rivers Probe into Broken Methanism and Prevention and Cure of Vertical Pit Wall of Freeze and Thaw

深厚流砂层下采用冻结法凿井,产生了冻融土。地层融陷,形成新地压,在竖井周围,产生负摩阻力;第三系泥岩受承压水侵蚀膨胀,造成井壁破裂。分析冻融土竖井井壁破裂机理,提出切实可行防治措施,为防治井壁破裂提供借鉴。

In deep drift sand strata, Has adopted the freeze method to dig a pit, Has produced the freeze and thaw soil. The strata melts to sink, and producing strata to press newly, the negative friction resistance is produced around the venical pit. The third system muddy rock swells when the pressure supponing water to invade. Result in the cracks of the pit wall. To analyze the broken mechanism of the venical pit wall in the soil of freezing and thaw To advance available prevention and cure measure, Break for pit wall of the prevention and cure, and offer use for reference.