DOI: 10.11799/ce202506006
Application of high performance fiber reinforced concrete in deep drilling wellbore bottom construction
YAO Zhishu
WANG Fajun
SONG Haiqing
YAN Zhongjun
HU Changhai
Abstract：Aiming at the problem that the bottom of deep drilling shaft wall is easy to crack in the process of pouring,curing and sinking,taking the north air shaft of Taohutu Coal Mine as the engineering background,the stress analysis of the shaft wall bottom and the preparation of high performance fiber concrete were carried out.The numerical simulation method was used to analyze the stress state of the bottom of the semi-elliptical rotating flat spherical shell shaft wall,and the key tensile stress area was identified.The results showed that there was a significant tensile stress area outside the top of the bottom of the shaft wall,and the maximum principal stress reached 0.56 MPa.There was a risk of tensile cracking,and the concrete at the bottom of the shaft wall should take anti-cracking measures.The optimal mix ratio of C75 fiber concrete at the bottom of the shaft wall is cement∶fly ash∶ground slag∶stone∶sand∶water∶water reducer∶fiber=400∶75∶85∶1011.8∶732.6∶145.6∶13.44∶2.0.The plate crack test shows that the crack resistance of fiber reinforced concrete is significantly better than that of ordinary concrete.According to the application result,using the proposed mix ratio,there was no crack at the bottom of the pouring shaft wall.
Keywords：shaft sinking by drilling methodbottom of shaft wallshaft constructionfiber concrete preparationanti-crack and impermeability
Publication Date：2025-06-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 42-48 )