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| Preliminary Discussion on Engineering Characteristics of Ethiopian Basalt Residual Soil |
| ZHANG Kun，LI Jian － qiang，XU Zheng － xuan |
| China Railway Eryuan Engineering Group Co． Ltd，Chengdu，Sichuan 610031，China |
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Abstract Research purposes:Combined Ethiopia light rail transmit investigation project ( phase one) ，the stratum lithology characteristics and physical and mechanical properties of basalt residual soil is analyzed by the comprehensive methods of mapping，exploration and laboratory tests．Comparison of domestic usual measures and local construction experience，engineering schemes of basalt residual soil are provided preliminarily．
Research conclusions: (1) Basalt residual soil is different from granite residual soil and common cohesive soil．Laboratory test result shows that it has some special traits such as smaller natural density，larger water content and void ratio，the free expansion rate greatly changes．(2) It is better to take many methods，such as in － site，laboratory test and engineering prospect，to make geotechnical analysis and evaluation of basalt residual soil in field investigation processing．(3) Chinese codes can be referred during investigation，but it can not be directly used，the local geotechnical investigation data，engineering experiences and methods should be collected in construction period．(4) This research results can be applicated for investigation of geotecnical engineering of metro and light rail transit in igneous area．
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Received: 19 October 2012
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Zhang Kun，Guo Jvbin，Li Jianqiang． Countermeasure and Primary Engineering Geological Problems of Newly － built Ethiopian Railway ［J］．Journal of Railway Engineering Society，2011(10) : 38－41．
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Yao Yuchun． Experimental Study on Calculation Parameter of Settlement for Completely Weathered Granite Foundation of Hainan Eastern Passenger Dedicated Line［J］．High Speed Railway Technology， 2011(6) : 48－52．
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2013, Vol. 30 
