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中文摘要：
为解决隧道近接施工极易造成的隧道塌方问题,以达成线新建铁路与既有线为依托,阐述了三线交叉D梁施工的过渡方法,即在保证既有线铁路和高速公路安全运营的前提下,对既有线下新建铁路右线路基进行D梁过渡爆破拆除.该方法很好地解决了施工时间紧、施工条件和施工环境受限的难点,为类似工程问题的解决提供了参考依据.
英文摘要：
To solve the problem of tunnel collapse in the approaching construction, taking the original and new railways of Dacheng line into consideration, the transition method of construction for three- line-crossing D beam is expounded： on condition of the safe running of original railways and freeway, construction method of transitional blasting demolition of D beam can be applied to the right-line roadbed of newly built railways. This method solves such difficulties very well as tight schedule of construction, constrained surroundings of construction, and provides reference to work out similar engineering problems.
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