管廊渗漏对其变形及周边土沉降特性的影响研究

Study on influence of utility tunnel leakage on its deformation and settlement of surrounding soil

地下综合管廊接缝处在外部作用下会产生相对位移,进而引发渗漏与周边土体侵蚀,而变形与渗漏耦合会进一步形成恶性循环。目前关于不同管廊形式、不同埋深、土体侵蚀程度和渗透系数等因素对管廊长期整体变形性能影响的研究较少。通过提出的渗流-应力模型,综合考虑土体-结构整体受力性能,可以定量地估计管廊接缝渗漏引起的管廊变形和地面沉降。研究发现,渗漏范围及稳定时间、渗漏点数目和渗漏引起的地面沉降,随着管廊抗弯刚度的减小而提高,随着管廊埋深、土体侵蚀程度和土体渗透系数的减小而降低。

The dislocation and opening may occur at the joints of utility tunnels under loads and could cause leakage at the joint and erosion of the surrounding soil.The coupling of the deformation and leakage at joint would further form a vicious circle.There are few studies on the effects of the forms of utility tunnels,the depth of utility tunnels,the erosion and permeability of soils on the long-term deformation of utility tunnels.Based on the proposed seepage-stress coupling model considering the overall mechanical performance of the soil-structure,the deformation of the utility tunnel and ground settlement caused by joint leakage can be quantitatively estimated.The results show that the leakage range,the leakage stable time,the number of leakage points and the ground settlement increase with the decrease of the flexural rigidity of the utility tunnel,decrease and with an decreasing tunnel depth,soil erosion and soil permeability.