卵砾石层大断面斜井井筒支护方法现场试验研究

Field test study of methods for supporting large-section inclined shaft in gravel layer

我国缺少在巨厚卵砾石层中采用普通施工方法掘进煤矿斜井井筒的成熟支护经验。结合伊犁一矿材料斜井和回风斜井的施工过程,设计了现场支护试验方案,对不含水和含水卵砾石层大断面斜井井筒的多种支护方法进行了试验。研究结果表明,含水与不含水卵砾石层斜井井筒相比,其支架变形量和支护难度显著变大;架棚临时支护结合钢筋混凝土永久井壁支护是不含水卵砾石层大断面斜井井筒有效的支护方法;含水卵砾石层地压显现明显,采用超前支护、架棚临时支护和钢筋混凝土永久井壁支护相结合的方法可以实现围岩稳定。由试验推断,库仑和太沙基土压力理论用于计算卵砾石层围岩压力误差显著。

China lacks construction experiences with common methods in inclined mine shaft of thick gravel layer.Combined with construction practices of the first inclined mines of Cailiao and Huifeng in Yili coal mine,the supporting programme is designed and quite a few supporting trials have been studied due to abundant water and non-aqueous sites.According to the field test results,the deformation of trestle gets larger and it is more difficulty to support in the abundant water site;The temporary support of beam joined with reinforced concrete is an effective method to support the large section inclined shaft in non-aqueous gravel layer.The deformation and the pressure grow rapidly while the shaft is in the abundant water gravel;it is proved that forepoling supporting together with the temporary support and reinforced concrete can control the surrounding's deformation and keep its stability.It is inferred by site test results that significant errors might occur when it is applied to calculating the pressure of gravel layer surrounding by Terzaghi and Coulomb earth pressure theory.