Safety Factors Analysis Of Urban Underground Space Construction

In order to better understand the occurrence rule of the construction securityincidents of City Underground Space Engineering，the paper used statistical methodsto have studied the case of construction security incidents about City UndergroundSpace Engineering of subways,inter-city rail and tunnel happened between2003to2013at home and abroad. According to the date of happen time of the accident,area,accident type，the number of accident and casualty to find the rule.At the sametime the accident classified by the reasons for accident.There are five factors thateffected the construction security incidents of City Underground Space Engineeringas following: Collapse and ground subsidence on account of excessive deformationof strata， surrounding rock instability and Improper supporting; Ineffectivemanagement of the project site and construction and the error of operation techniqueand construction equipment; Bad geological condition (piping, water seepage) lead todisaster; The destruction of underground pipe network; Other factors(unpredictabledisasters and problems left over by history). Analyzed the five factors to calculatethe probability of various influencing factors in order to put forward some preventivemeasures in advance. According to the measures carried out to reduce the happen ofsecurity incidents of City Underground Space Engineering，casualties and propertyloss.