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 gro...

• 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。