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相比于传统钻爆法及其它掘进方法,TBM在深埋长大隧道施工过程中优势明显,但同时其也更易受控于地质因素而影响施工。分析和研究特定环境下的各种地质因素对TBM施工的影响,并提出相应的施工对策,具有较大工程意义。西南地区某在建铁路深埋长大隧道D1K212+500~D1K226+840段具备进行TBM施工的运输、场地、电力等条件,但地质条件复杂,不良地质发育。以该段作为研究段,采用地质调绘、钻探、物探、声波测井、取样试验等方法对各影响因素展开地质调查并收集相关数据,通过定性和定量分析表明,影响研究段TBM施工的因素主要有断层破碎带、自稳能力较差的局部段落岩体及强富水区。施工时可相应采用掘进与加固相结合并降低掘进速度、调整掘进参数,适当超挖并及时支护,逆向掘进,超前预报,引、排水等方法来降低不良地质因素对TBM施工的影响。研究成果直接服务于本工程施工,相关定量参数可为前期TBM选型提供参考,工程意义较大。
Compared to other tunneling and blasting method and the traditional method of drilling, TBM construction process of growing up in the deep tunnel obvious advantages, but it is also more controlled by geological factors affecting the construction. Under various geological factors affecting the specific analysis and research environment to TBM Construction, construction and propose appropriate countermeasures, with great engineering significance. Conditions of transport, site and electricity for TBM construction are provided for D1K212 +500 ~ D1K226 + 840 tunnels of a railway under construction in Southwest China, but the geological conditions are complex and the development of unfavorable geology is developed. Taking this section as the research section, geological survey, drilling, geophysical exploration, sonic logging, sampling and other methods were used to conduct geological survey and collect relevant data. Through qualitative and quantitative analysis, the factors influencing TBM construction in the research section Mainly fault fracture zone, the self-stabilization ability of the local section of rock mass and strong water-rich area. During the construction, the influence of adverse geological factors on TBM construction can be reduced by combination of tunneling and reinforcement, lowering of tunneling speed, adjustment of tunneling parameters, appropriate over excavation, timely support, reverse heading, advanced prediction, drainage and drainage. The research results directly serve the construction of this project. The relevant quantitative parameters can provide references for the selection of pre-TBM, which has a great project significance.