盾构隧道下穿对土质路基无碴轨道的影响

随着高速客运专线建设在国内的全面开展,无碴轨道技术也正从试验研究阶段逐步走向应用.但若土质路基上铁路采用无碴轨道方式,由于其对路基沉降的苛刻要求,市政下穿项目对其影响不能忽略不计.本文针对盾构隧道推进中引发的地表沉降采用PECK公式对其影响因素进行了讨论;根据有关规定的的地表不均匀沉降的限值,针对不同的隧道直径提出了上覆土最小厚度的经验公式.

The Reasearch about the Affect of the Shield Tunneling across the Ballastless-rail

With the development of the high-speed-way in china,the technology of ballastless-rail is being brought into effect.If the ballastless-rail is employed on the embankments,the disturbance to the ballastless-rail during the shield-tunneling across the embankments will not be avoided.This paper employ the PECK formula to dicuss the key-factors of shield-tunnelling,proposes a experiential formula about the minimum depth of the covering-layer.