排水箱涵垮塌检测与原因分析

针对某排水箱涵垮塌事故，在现场对结构混凝土强度、钢筋配置、砂浆强度等检测的基础 上，结合复核计算，对垮塌原因进行系统的分析。结果显示，覆土厚度大大超出设计厚度是造成箱涵 垮塌的根本原因。过厚覆土超出箱涵盖板承载能力，导致部分区域盖板断裂，盖板断裂使侧墙上端失 去了支撑，引起局部侧墙垮塌。此外，盖板覆土过厚，使侧墙墙身弯矩过大，强度不满足规范要求， 导致部分区域侧墙向内倾倒，也使顶板失去支撑而垮塌。

Detection on collapse of a box-culvert and analysis on its causation

Based on the in-situ detections made on the structural concrete strength,arrangement of reinforcement,mortar strength,etc.,the causation of the collapse of a box-culvert is systematically analyzed along with a relevant re-check calculation.The results show that the basic causation of the collapse is that the thickness of the soil coverage is far beyond that of the design.The over-burden of the soil-coverage exceeds the bearing capacity of the cover-plate,and then causes the fractures of some cover-plates in...