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我部承建的一地下洞库主洞长320.89m,跨度19.6m。工程竣工2个月后,主洞水磨石地坪中轴线附近发现一条细微裂缝,缝的长度、宽度随时间逐渐扩展,至竣工6个月时裂缝已接近通长,宽度平均为0.5～1.5mm,见下图。一、原因分析1.中轴线上水磨石面层裂缝的正下方为混凝土垫层冲筋,水磨石位置未设置分格条。2.由于地坪面积过大,60mm 厚细石混凝土垫层收缩、变形集中在冲筋两侧,由于水
The main tunnel length of an underground tunnel built by our ministry is 320.89m with a span of 19.6m. Two months after the completion of the project, a slight crack was found near the central axis of the terrazzo floor in the main tunnel. The length and width of the crack gradually expanded with time. By the time of completion of 6 months, the crack was close to the pass length with an average width of 0.5 to 1.5 mm, See below. First, the analysis of the reasons 1. The axis of the terrazzo surface cracks just below the concrete cushion Rush, terrazzo location is not set grid. 2. As the floor area is too large, 60mm thick fine stone concrete cushion shrinkage, deformation concentrated in the red tendons on both sides, due to water