论文部分内容阅读
六盘山隧道是宝（鸡）中（卫）铁路最长的隧道,其浅埋段位于DK247+035～DK247+155,长120m,是该隧道施工的重点和难点。洞身通过王罐沟和雪沟的交汇处。洞顶基岩厚仅0～4m,为Ⅱ类泥页岩,其上覆盖第四纪松散含水砾石及砂粘土,厚10～20m,土质很差,渗水性强,隧道浅埋段最大涌水量估算为1567m~3/d,地表沟内终年流水,隧道施工通过该段时恰逢洪水季节,如果对开挖、支护、衬砌各环节处理不当,将可能出现大塌方,使地表水灌入洞内,后果严重。 经建设单位、设计单位、上级有关部门的领导和专家分析研究,决定地上地下综合整治。 地上,将王罐沟及雪沟作永久性铺砌处理,用75~#砂浆砌片石铺砌沟底,王罐沟铺砌宽10m,长160m,雪沟铺砌宽4m,长110m,地表铺粘土夯实加碎石垫层。此项铺砌先期动工,要在隧道掘进至该段前完成。
Liupanshan tunnel is the longest railway in Baoji (chicken), with its shallow buried section at DK247 + 035 ~ DK247 + 155 and a length of 120m, which is the key and difficult point of the tunnel construction. Hole through the Wang Gully and snow ditch interchange. The bedrock bedrock thickness is only 0 ~ 4m, which is a type Ⅱ shale. It is covered with Quaternary unconsolidated water-bearing gravel and sand clay with a thickness of 10-20m. The soil quality is very poor and the water seepage is strong. The maximum water inflow Estimated to be 1567m ~ 3 / d, year-round water flow in the surface ditch will occur. When the tunnel construction passes through this section, the flood season coincides with the flood season. If the various steps of excavation, support and lining are not properly handled, the landslide may occur, Inside the cave, the consequences are serious. The construction unit, the design unit, the higher the relevant departments of the leaders and experts analysis and study, decided to comprehensive renovation of the ground. On the ground, the canopies and snow ditches for permanent paving treatment, with 75 ~ # mortar masonry paving the bottom of the ditch, Wang tank ditches paved wide 10m, length 160m, snow ditch paved wide 4m, length 110m, compaction of the surface paving clay crushed stone level. This paving work started early, to be completed before the tunneling to the paragraph.