ANALYSIS ON REASONS FOR RUPTURES OF SHIELD TUNNEL PIPE SEGMENT AND RELEVANT MEASURES
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During construction of a segment in the northward-extension project of Guangzhou Subway Line 3,ruptures on pipe segment are detected for many times.After statistical analysis,the ruptures can be divided into three types including broken corner and edge,full-length broken short edge and broken bolt hole.According to these rupture types,relevant reasons are analyzed.It is determined that most of the ruptures are manually generated during construction,workers′ wrong operation or incorrect control on excavation parameters.Therefore,tube damages can be avoided or reduced obviously by improving workers′ proficiency and strengthening managers′ control on excavation parameters.