穿越地裂缝的地下综合管廊变形规律与应力分布特征研究

Study on Deformation Law and Stress Distribution Characteristics of Underground Utility Tunnel Crossing Ground Fissures

以穿越西安f7地裂缝的地下综合管廊工程为研究对象,基于有限元数值模拟,找出了地下综合管廊在地裂缝带地基不均匀沉降下的受力特征及变形规律。分析结果表明:在地裂缝作用下,中段管廊(跨地裂缝)变形最为严重,管廊接头处沉降量发生突变,为薄弱区域;管廊底板混凝土以受压为主,而顶板以受拉为主,当沉降量在地裂缝处超过250 mm时,管廊顶板所受拉应力超过混凝土轴心抗拉强度,造成管廊顶板出现横向裂缝。

Taking the underground utility tunnel Project Crossing Xi’an f7 ground fissure as the research object, based on the finite element numerical simulation, the mechanical characteristics and deformation law of the underground utility tunnel under the uneven settlement of ground fissure zone foundation are found out. The results of analysis show that under the action of ground fissures, the deformation of the middle section utility tunnel(crossing ground fissures) is the most serious, and the settlement at the joint of the utility tunnel changes abruptly, which is a weak area;the concrete at the bottom of the utility tunnel is mainly under compression, while its roof is mainly under tension. When the settlement at the ground fissures exceeds 250 mm, the tensile stress on the roof of the utility tunnel will exceed the axial tensile strength of the concrete, resulting in transverse cracks on the roof of the utility tunnel.