Abstract：
In recent years, the rainfall-induced inverted arch heaving diseases occur frequently in the railway tun? nel, which seriously affects the tunnel operation safety. Based on the inverted arch heaving case of a high-speed railway tunnel, this paper discusses the causes of the heaving disease by comprehensively considering the effects of the rainfall, the topographic and geological conditions, and the actual conditions of the drainage system. The numerical simulation method is used to reproduce the occurrence process of the disease, the characteristics of the tunnel structure stress field and seepage field during the disease occurrence are explored, and then the remediation measures are proposed in combination with the disease situation. The results show that: (1) the water-rich connectivity of the strata caused by complex geological conditions, the unpredictable high-intensity concentrated rainfall, and the partial failure of the drainage system are the main causes of the disease, and the excessive water pressure outside the tunnel caused by the above factors is the direct cause of the disease; (2) based on the FLAC3D software, an inversion analysis method for the water pressure-induced inverted arch heaving diseases is proposed, by which it reproduces the occurrence of inverted arch heaving diseases in the studied case and provides a new idea for the analysis of similar diseases; (3) based on the disease situation, the comprehensive treatment measures are adopted, including "installing of the pressure-release holes + grouting and anchorage at the tunnel bottom + adding of the drainage tunnels + treatment at the ground surface ", proving the effectiveness of the treatment measures after field implementation, which can be used as reference for similar tunnel disease remediation works.
LI Linyi1 YANG Junsheng1 WANG Lichuan1,
2 WANG Shuying1 FANG Xinghua1 XIE Yipeng1
.Cause Analysis and Treatment Measures of the Inverted Arch Heaving Disease of a High-speed Railway Tunnel under Heavy Rainfall[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(1): 27-36
2021, Vol. 58 