Abstract：Research purposes：The study is done on the influences of construction of the tunnel under-passing new loess gulch on the bias and the construction technology is presented to prevent tunnel collapse.
Research conclusions：(1) To take some measures, such as refilling soil-cement, building concrete ditch, driving biting piles, can prevent the penetration and corruption of ground water, eliminate the impact of ground water on collapsible loess and enhance the stability of gulch and side slope. (2) To consolidate sand strata with sodium silicate grouting can reduce the surface subsidence caused by tunneling and guarantee the tunneling stability. (3) To enhance the strength and rigidity of the primary support for tunnel lining can control the support deformation caused by tunneling and effectively control the influences of the tunnel bias (4) To optimize CRD construction method can shorten the distance and time of working procedure and make the primary lining forming a circle as soon as possible to well control the tunnel deformation and surface subsidence.
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2010, Vol. 27 
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