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高速铁路隧道衬砌欠厚整治技术

2019-07-08叶鹏勇

价值工程 2019年16期

叶鹏勇

摘要:高速铁路设计时速达到250~350 km,由于在运营过程中因动车通过隧道时速快,对隧道扰动特别大,从而对隧道施工自身质量要求特别高。而隧道施工中由于工序卡控、施工工艺等不可避免会存在一定欠厚缺陷,给后期运营带来了极大的安全隐患。本文以成贵高速铁路CGZQSG10标隧道工程为工程实例,通过对隧道欠厚缺陷原因分析、整治方法的探索与工程实践,总结出了一套较为完善和成熟的经验,对今后其他隧道工程提供衬砌欠厚防治及整治有一定借鉴作用。

Abstract: The design speed of high-speed railway reaches 250~350 km. Because the speed of motor train passing through the tunnel is fast in the operation process, the tunnel disturbance is particularly large, so the quality of the tunnel construction itself is particularly high. In the tunnel construction, due to process card control and construction process, there will inevitably be certain thickness defects, which will bring great security risks to the later operation. In this paper, the CGZQSG10 standard tunnel project of Chenggui high-speed railway is taken as an engineering example. Through the analysis of the causes of the thinner thickness defects of the tunnel, the exploration of the remediation method and the engineering practice, a set of relatively complete and mature experience is summarized, which has certain reference for the other similar tunnel projects.

关键词:高速铁路;衬砌欠厚;整治技术

Key words: high-speed railway;thinner lining thickness;remediation technology

中图分类号:U459.1                                      文献标识码:A                                  文章编号:1006-4311(2019)16-0125-04

1  缺陷原因

①浇筑拱顶混凝土时未灌满导致拱顶二衬欠厚;②测量放样错误,或测量仪器精度低,造成初支侵线未处理就浇筑混凝土;③开挖过程塌方,未安全起见避免再次扰动围岩,对局部基岩未处理就安装钢架,喷射混凝土,后期衬砌施工时又未处理;④初支支护预留沉降量过小,围岩变形过大。

2  整治措施

隧道衬砌欠厚主要以拆换方式进行整治。验证欠厚范围,查明欠厚部位是否有钢筋,根据对应指标进行拆换处理。

3  治理方案

3.1 对欠厚处鉆孔验证

首先在监理见证下对欠厚范围进行地质雷达检测和钻孔验证,确定准确位置及范围。验证以物探检测数据为辅助依据,钻孔验证数据为主要依据,确定需拆换的范围。钻孔验证沿缺陷中心线向四周打孔,打孔间距随周边加密布置,同时使用尺量衬砌厚度、脱空厚度,准确验证欠厚区,确认拆换范围。……

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