DOI: 10.3724/SP.J.1201.2011.01012

South-to-North Water Diversion and Water Science & Technology (南水北调与水利科技) 2011/9:1 PP.12-17

Excavation Classification of Neogene Hard Soil-soft Rock at Anyang Section in the Middle Route of South-to-North Water Diversion Project

The canal of Anyang Section in the Middle Route of South-to-North Water Diversion Project needs to excavate a lot of rock and soil.There are lots of Neogene hard soil-soft rocks such as marlite,conglomerate,sandstone etc.It is very different to the preliminary perception and there are quite different understanding of boundary lines between rock and soil.The geotechnical properties were got by field investigation,point load test,drilling test and indoor mechanical and chemical,acoustic tests.The rock and soil excavation classification was made based on rock quality and soft rock-hard soil classifications.Uniaxial compressive strength,longitudinal wave velocity,the net drilling rate and natural bulk density were taken as the indicators and the excavation classification system was composed of 9 classes and 16 sub-classes.The result showed that it gave a good assessment of the different characteristics of rock excavation and gave a reasonable solution to the project cost.The classification system may give a good reference for other similar projects involving Neogene hard soil-soft rocks.

Key words:South-to-North Water Diversion Project,Middle Route,hard soil-soft rock,excavation classification

ReleaseDate:2014-07-21 15:58:49

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