LI Yong-suo, ZHANG Ke-neng, HUANG Chang-bo, et al. Analysis of surface subsidence of tunnel built by pipe-roof pre-construction method[J]. 2011, 32(12).
LI Yong-suo, ZHANG Ke-neng, HUANG Chang-bo, et al. Analysis of surface subsidence of tunnel built by pipe-roof pre-construction method[J]. 2011, 32(12).DOI:
Underground station of Shenyang Metro line 2 is the first underground engineering built by pipe-roof pre-construction method (PPM). The surface subsidence caused by the construction was monitored; and revised Peck model was developed to predict the subsidence. Some conclusions are drawn as follows. (1) The predicted result is consistent well with the monitoring data. (2) Surface subsidence caused by tunnel construction with PPM is characterized by the whole subsidence; and the subsidence value is pretty equal to the one of underground structure foundation
and it is effective to control surface subsidence by controlling the the sink of foundation of tunnel structure with PPM. (3) The underground permanent structure built before constructing tunnel with PPM could obviously constraint the surrounding rock with 0.0005%-0.0020% of stratum loss rate and 0.5 of width coefficient of sinking tank. (4) Surface subsidence caused by PPM is much less than the normal construction method
which has significantly social and environmental benefits; and this method is suitable to construct the underground urban traffic hub and tunnel projects that crossing traffic trunk lines and is worth to be studied and promoted further.