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Abstract During construction of tunnel with plenty water extremely-weak surrounding rock at the entrance section of the Jiling Tunnel, the applied key technique was a synthetic dewatering and drainage technique which consisted of the application of horizontal extra-lead negative-pressure water pumping, advanced-type shotcrete fracture grouting with deep and long cased boreholes. deep-well dewatering, grouting with large pile sector, as well as the drainage and leaking stoppage at working surfaces, During the implementary procedure of these technical measures, the supervision, measuring and reversing parameters repeatedly were be the very effective control means.
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Received: 14 October 1999
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1999, Vol. 16 
