约束混凝土结构在井筒支护中的研究与应用

The research and application of confined concrete structure in shaft lining

约束混凝土井壁由于采用材料强度和弹性模量都高于钢筋混凝土的钢板作为其内层结构 ,内外层产生良好的复合作用 ,使外层钢筋混凝土筒体在受力时 ,内表面产生径向约束压应力 ,从而提高井壁的整体承载能力 ,避免井壁因径向拉应变超过材料极限而发生破坏 .模型试验和工程应用都证明了约束混凝土结构是一种理想的抗地层竖向附加力的井壁结构型式 .

In a confined concrete shaft lining, owing to the adoption of the steel plate with the strength and elastic modulus higher than reinforced concrete as its inner structure, the favorable composite interaction between inner and outer structure generates a radial confined compressive stress at the inner surface of the outer reinforced concrete cylinder when it is forced, the integral carrying capacity of the shaft lining is enhanced and thus avoid the shaft lining break due to the radial tensile strain beyond the limit of the material. The model tests and the engineering application prove that the confined concrete structure is an ideal type of the shaft lining structure to effectively resist the vertical additional forces from the strata.