井壁破裂与砼的徐变破坏

杨为民, 周治安

杨为民, 周治安. 井壁破裂与砼的徐变破坏[J]. 煤田地质与勘探, 2003, 31(4): 38-40.
引用本文: 杨为民, 周治安. 井壁破裂与砼的徐变破坏[J]. 煤田地质与勘探, 2003, 31(4): 38-40.
YANG Wei-min, ZHOU Zhi-an. The sidewall fracture of the shaft and the creep of concrete[J]. COAL GEOLOGY & EXPLORATION, 2003, 31(4): 38-40.
Citation: YANG Wei-min, ZHOU Zhi-an. The sidewall fracture of the shaft and the creep of concrete[J]. COAL GEOLOGY & EXPLORATION, 2003, 31(4): 38-40.

 

井壁破裂与砼的徐变破坏

详细信息
    作者简介:

    杨为民(1965-),男,安徽庐江人,安徽理工大学博士,副教授,从事工程地质、岩土工程方面的教学和科研工作.

  • 中图分类号: TD352

The sidewall fracture of the shaft and the creep of concrete

  • 摘要: 黄淮地区煤矿井壁破裂大都是由于厚松散覆盖层底部含水层失水固结,地层沉降,导致井壁外侧出现负摩阻力,从而在竖井轴向上形成附加的下拉荷载而引起。这些破裂始见于保护层砼的剥落,而后见壁中砼发育密集的竖直砂浆裂隙,砼中骨料因界面裂隙的发育而被剥离,砼向井内膨胀并呈现“假塑性”等。除这些特征外,从负摩阻力的出现及增荷过程来看,井壁破裂是在轴向高压应力长时间作用下的结果,它涉及的是井壁砼的长期强度,故井壁破裂属于砼徐变破坏。
    Abstract: In coal mines of Huang Huai region,the sidewall fracture is basically induced by axial additional loading downwards to the shaft,which is brought about by negative skin friction outside of the sidewall due to the drain consolidation of the aquifer at the bottom of the deep loose overburden layer and the settlement of the strata.The fracture begins from the flake of the sidewall concrete.With the axial loading increasing,the perpendicular closely spaced sand slurry fissures in the concrete of the shaft growth,the aggregates of the concrete are peeled off as a result of inter faced fissures,and then the concrete dilate to the inner of the shaft and the deformation shows the phenomena of "pseudo plastic".Besides these properties above,the fracture of the sidewall results from axial high compressive stress for a long time in view of the negative skin friction and the process of loading increasing.
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出版历程
  • 收稿日期:  2003-01-06
  • 网络出版日期:  2023-03-21

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