Abstract: The diseases and their causes of tunnel induced by heavyhaul transportation are analyzed, with the disease data of tunnel on DatongQinhuangdao railway as examples. Conclusions drawn are as follows: 1) Two singleline tunnels might be the best choice when karst tunnel with water and mud bursting section longer than 4 km and soft and weak surrounding rocks section longer than 1000 m or section with soft rocks and high ground stress longer than 500 m. 2) Singleline tunnel crown with risespan ratio of 1/6.5 and twinline tunnel with risespan ration of 1/10.5 can meet the running requirements. 3) The gradient in the tunnel should lower than 3‰, ground with rich water should less than 5‰. Water draining technologies are presented. 4) The design parameters of the structure under the track bed are decided. 5) Countermeasures of the connection sections are adopted. 6) The general investigation and load bearing requirements of the tunnel foundation are proposed.

Key words: heavyhaul railway tunnel, disease, design technology, tunnel structure, waterproofing and drainage, connection section