高地应力地下厂房岩壁吊车梁结构安全性分析

Structural Safety Analysis of Rock-anchored Crane Beam of Underground Powerhouse with High Geostress

对于高地应力区地下厂房,岩壁吊车梁浇筑完成后下部厂房洞室开挖可能会对吊车梁产生不利影响。对此,采用三维弹塑性有限元法分析了某地下厂房岩壁吊车梁施工期和运行期应力变形、梁体锚杆受力及梁体的稳定性。结果表明,在高地应力场中,岩壁吊车梁会产生较大变形,梁体和岩壁结合面会出现较大的拉应力,在吊车梁浇筑完成后的3期内梁体应力变形增大,随着开挖部分远离梁体,梁体应力变形变化趋于平缓,梁壁结合面安全系数增大,为类似工程中吊车梁浇筑和洞室施工提供了参考依据。

For underground powerhouse in high geostress area, the excavation of the lower powerhouse cavern after the completion of the pouring of the rock-anchored crane beam may have an adverse impact on the crane beam. Aiming at this problem, three-dimensional elastoplastic finite element method was used to analyze the stress and deformation, the stress of the anchor and the stability of the crane beam of an underground powerhouse during construction and operation period. The results show that in the high geostress field, the rock-anchored crane beam will have large deformation, and the joint surface between the beam and the surrounding rock will have large tensile stress. After the crane beam is poured, the stress and deformation of the beam will increase greatly in three stages. As the excavated part is far away from the beam, the stress and deformation of the beam will become gentle, and the safety factor of the joint surface between the beam and the wall will be large, which can provide a reference for the crane beam pouring and cavern construction in similar projects.