预切槽法开挖黄土隧道预衬砌支护参数研究

发布时间：2018-08-24 17:19

【摘要】：研究目的:随着我国交通建设的发展,迫切需要解决软弱围岩隧道机械化施工的问题,本文以洪亮营大断面黄土隧道为依托工程,采用数值模拟方法分析不同条件下预衬砌的整体安全性,通过对预衬砌的支护参数进行分析,以期为后续类似工程的设计与施工提供参考。研究结论:(1)钢拱架间距对预衬砌整体安全系数有显著影响,间距越小,安全系数越高;(2)不同的预衬砌拱脚处理措施,对预衬砌整体安全系数影响较大;(3)由于切槽采用分段施工,各段接头部位的安全系数较低,当预衬砌局部弱化程度超过50%时,预衬砌的整体安全系数不能满足安全要求;(4)本研究以洪亮营大断面黄土隧道实际工程为依托,获取了预衬砌在不同的埋深、不同的钢拱架间距、不同的拱脚处理措施以及不同的预衬砌局部弱化程度条件下的整体安全性,可为预切槽法隧道在今后的工程设计和施工中提供指导作用。
[Abstract]:Research purpose: with the development of traffic construction in our country, it is urgent to solve the problem of mechanized construction of soft surrounding rock tunnel. The overall security of pre-lining under different conditions is analyzed by numerical simulation method, and the supporting parameters of pre-lining are analyzed in order to provide reference for the design and construction of similar projects. The conclusions are as follows: (1) the distance of steel arch frame has a significant effect on the overall safety factor of pre-lining, and the smaller the spacing, the higher the safety factor; (2) the different treatment measures of arch foot of pre-lining have a great influence on the overall safety factor of pre-lining; (3) because of the sectioned construction of cutting groove, When the local weakening degree of pre-lining exceeds 50, the overall safety factor of pre-lining can not meet the safety requirements. (4) this study is based on the actual project of Hongliangying large section loess tunnel. The overall safety of the pre-lining is obtained under the conditions of different burying depth, different steel arch frame spacing, different arch foot treatment measures and different local weakening degree of the pre-lining. It can provide guidance for pre-cut tunnel in future engineering design and construction.
【作者单位】：中铁第一勘察设计院集团有限公司;
【基金】：中国铁路总公司科技研究开发计划(2013G011-C)
【分类号】：U455.7

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