Cause Analysis and Treatment of Mud Outburst in the Dingshang Tunnel
(1 Hunan Chenning Expressway Construction and Development Co., Ltd., Chenzhou 423000;
2 College of Civil Engineering, Hunan University, Changsha 410082)
Abstract：
Considering the mud outburst during construction of the Dingshang tunnel, the geological and hydrogeological conditions of this tunnel section were studied by means of geological investigation, geological radar prospecting, and drilling. In addition, the development, occurrence, and scope of karst as well as its scale in the Dingshang tunnel were examined. It was postulated that the main cause of the tunnel mud outburst was that water collection in karst depressions, along with sink holes and fissures in the bedrock, constantly permeated the weak zones of granite, calcareous shale, and limestone, resulting in vertically well-developed, closed tubular karst caves. Treatment measures including pipe-roofing supports, backfill of karst caves, and strengthening of the primary support were applied successfully to resolve the hazard created by the mud outburst in the Dingshang tunnel.
TIAN Jun-1,
2 ,
Yang-Xian-Zhang-1
.Cause Analysis and Treatment of Mud Outburst in the Dingshang Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2011,V48(4): 152-156
2011, Vol. 48 