On the Mechanical Behaviour of the Gibraltar Strait Breccias
The tunnel planned for the Gibraltar Strait fixed link will cross-among other formations-two paleo-channels filled with breccias.The breccias exhibit poor mechanical properties in the range between stiff clays and weak rocks.The overburden and high pore pressures in-situ may lead,in combination with the low strength of the breccias,to heavy squeezing during construction of the tunnel.The mechanical properties of the breccias were studied using special triaxial tests.The testing technique is very demanding due to the need for pore water control in combination with high applied loads.Neither standard rock nor soil mechanics testing equipment is adequate for this purpose.In addition,the low hydraulic conductivity of the breccias demands extremely low loading rates,which leads to very long test durations.The paper presents and comments on the test results on the strength,volumetric behaviour,consolidation state and hydraulic conductivity of the breccias.
Weixin Dong E.Pimentel G.Anagnostou
Department of Civil,Environmental and Geomatic Engineering ETH Zurich Wolfgang-Pauli-Strasse 15,8093 Zurich,Switzerland
国际会议
北京
英文
409-416
2012-10-15（万方平台首次上网日期，不代表论文的发表时间）