黄土隧道地基的湿陷性问题研究

发布时间：2018-07-11 15:59

本文选题：黄土 + 隧道　；参考：《铁道工程学报》2015年12期

【摘要】：研究目的:我国在黄土地区修建了大量的隧道工程,对隧道地基的湿陷性评价和处理没有专业规范,仅参考《湿陷性黄土地区建筑规范》(GB 50025—2004)的有关内容执行,在隧道内仰拱未封闭条件下进行地基处理,速度慢,难度大,风险高。结合郑西、宝兰客专科研项目,提出黄土隧道的湿陷条件与建筑工程不同,隧道工程基底力学模型也不同于建筑工程,不能套用建筑规范,需研究适用于隧道工程的湿陷性系列技术。研究结论:(1)新黄土发生湿陷的内因是其特殊的"峰窝状"结构,诱发因素及必要条件为外部荷载和水;(2)隧道开挖对其地基为减载作用,建筑工程结构对地基为加载作用;(3)隧道工程地基的湿陷变形从隧道底部起算(建筑工程从地面起算),隧道两侧及顶部土层的湿陷量不计入;(4)隧道地基湿陷量计算值为隧底各黄土层湿陷量的累计值,相应湿陷性等级划分为三级;(5)一般条件下,隧道洞门及洞口段地基需进行湿陷性处理;(6)相应研究主要成果已纳入《铁路黄土隧道技术规范》(Q/CR 9511—2014),并应用于宝兰客专等线的铁路隧道建设。
[Abstract]:Research objective: China has built a large number of tunnel projects in the loess area. There is no professional standard for the evaluation and treatment of the collapsibility of the tunnel foundation, only referring to the relevant contents of the Building Code for collapsible Loess region (GB50025-2004). It is slow, difficult and risky to treat the foundation under the condition of unclosed invert in the tunnel. Combined with the scientific research project of Zheng Xi and Baolanke College, it is pointed out that the collapsing condition of loess tunnel is different from the construction project, and the foundation mechanics model of the tunnel project is also different from that of the construction project, so the building code cannot be applied. A series of collapsibility techniques suitable for tunnel engineering should be studied. The conclusions are as follows: (1) the internal cause of collapse of new loess is its special "peak-nest" structure, and the inducing factors and necessary conditions are external load and water, (2) the excavation of tunnel reduces the load on the foundation. (3) the deformation of the foundation of the tunnel works from the bottom of the tunnel (from the ground to the ground), the amount of the collapse on both sides of the tunnel and the top soil layer is not included; (4) the calculation of the settlement of the foundation of the tunnel The value is the accumulative value of the amount of collapses in each loess layer at the bottom of the tunnel, The corresponding collapsibility grade is divided into three levels; (5) under general conditions, (6) the main research results have been incorporated into the Technical Specification of Railway Loess Tunnel (Q / CR 9511-2014), and applied to the construction of railway tunnel in Baolanke special line.
【作者单位】：中铁第一勘察设计院集团有限公司;西安理工大学;
【分类号】：U452.11

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