针对地裂缝分布较为密集的城市,地下综合管廊等线性工程不可避免要穿越地裂缝,而地裂缝场地上下盘垂直错动会严重威胁地下综合管廊的安全。为此,以西安市幸福路地下综合管廊为研究背景,建立了土与结构共同作用的三维有限元分析模型,研究了上下盘不同错动量下综合管廊的损伤特征和场地土应力应变的变化,引入了损伤指数建立管廊安全评价分类标准(DS0-DS3),以评估结构损伤。结果表明:管廊受拉损伤区集中在下盘上层舱室、地裂缝处墙体、上盘下层舱室,受压损伤区集中在地裂缝处墙体;受拉损伤控制管廊损伤;管廊结构薄弱位置在上盘为下层大舱底板,在地裂缝处为下层大舱侧墙,在下盘为上层大舱顶板;当错动量达到300 mm,上盘管廊上部土体塑性区向上发展贯穿土体,管廊大部分损伤区达到DS3,出现大面积混凝土剥落,结构失效。
In cities with dense ground fissure distributions, linear infrastructures like underground utility tunnel (UUT) inevitably intersect with ground fissures. The vertical displacement between the hanging wall and footwall poses a significant threat to the safety of UUT in ground fissure site. For this reason, taking the UUT in Xi'an Happiness Forest Belt as the prototype structure, 3D finite element models that considered the soil-structure interaction were developed. The strain distribution, damage characteristics of the UUT, and the stress variations in the site soil under different dislocation magnitudes were analyzed. In addition, a damage index was introduced to establish the classification criteria (DS0-DS3) for the safety evaluation of the UUT in order to assess the structural damage. The results indicate that: The tensile damage areas in the UUT are concentrated in the upper level compartment of footwall, the wall at the fissure location, and the lower level compartment of hanging wall; the compressive damage areas are concentrated in the wall at the fissure location; the main damage in the UUT is primarily controlled by tensile damage; the weak areas of the UUT are the bottom slab of the lower level large compartment in hanging wall, the side wall of the lower level large compartment at the fissure location, and the top slab of the upper level large compartment in footwall. When the vertical displacement reaches 300 mm, the plastic zone of the upper soil of the hanging wall UUT develops upwards and runs through the soil. Most of the damaged areas of the UUT reach DS3, causing large-scale concrete peeling and structure failure.
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