000199632 001__ 199632
000199632 005__ 20181203023519.0
000199632 0247_ $$2doi$$a10.1007/s10064-013-0490-7
000199632 022__ $$a1435-9529
000199632 02470 $$2ISI$$a000335156900013
000199632 037__ $$aARTICLE
000199632 245__ $$aEPB tunneling challenges in bouldery ground: a new experience on the Tabriz metro line 1, Iran
000199632 260__ $$aHeidelberg$$bSpringer Verlag$$c2014
000199632 269__ $$a2014
000199632 300__ $$a12
000199632 336__ $$aJournal Articles
000199632 520__ $$aUnderground construction of the Tabriz metro line 1 involved boring twin tunnels with two earth pressure balance machines in alluvial deposits. Although this type of machine is recommended for excavation in fine soils, its performance was evaluated in this project where part of the ground consists of alluvial deposits with particle size ranging from silt to boulder and even rock blocks. It was found that the tunnel boring machine (TBM) performance was highly reduced due to the variation in ground conditions. Many types of problem were observed during the excavation in coarse grained alluvial deposits including high cutter-head torque, excessive wear of tools, breaking of TBM parts and ground instabilities in the form of large settlement and ground collapse. A trial effort was implanted to stabilize the overburden ground by the injection of cement grout, but this proved to be unsuccessful. In both cases, the excavation operation was delayed. With the experience gained from the excavation of the first tunnel and use of foam with a high foam expansion ratio as a soil conditioner in closed mode, the performance of the TBM in the second tunnel improved.
000199632 6531_ $$aTabriz metro line 1
000199632 6531_ $$aEPB TBM tunneling
000199632 6531_ $$aBouldery ground
000199632 6531_ $$aSoil conditioning
000199632 700__ $$aBarzegari, Ghodrat$$uUniv Tabriz, Dept Geol, Tabriz, Iran
000199632 700__ $$aUromeihy, Ali$$uTarbiat Modares Univ, Dept Geol Engn, Tehran, Iran
000199632 700__ $$0240199$$aZhao, Jian$$g169975
000199632 773__ $$j73$$k2$$q429-440$$tBulletin Of Engineering Geology And The Environment
000199632 909C0 $$0252061$$pLMR$$xU10258
000199632 909CO $$ooai:infoscience.tind.io:199632$$particle$$pENAC
000199632 917Z8 $$x229715
000199632 937__ $$aEPFL-ARTICLE-199632
000199632 973__ $$aEPFL$$rREVIEWED$$sPUBLISHED
000199632 980__ $$aARTICLE