Abstract：Research purposes：When digging to earth - rock interface of the right cutting surface，multiple retrogressive tensile fractures appeared to the right ground of the cutting of the end area of the Taigong Station and the varying degrees of slide also appeared to the right slope to form the engineering landslide. Through analyzing the reasons for the engineering slope of the Taigong Station of the Lanzhou 一 Chongqing Railway, this paper puts foreward the treatment measures and ideas on how to strengthen the survey of high slope and deep cutting area and summarize the survey and test methods fo providing the reference to the similar projects.
Research conclusions：1) When the cutting soil layer is rather thick，the retaining engineering should be done first in the construction process and the monitoring of the slope on the both sides should be strengthened. ( 2 ) In the thick red soil layer area, the necessary retaining measures should be taken to the soil cutting or half soil and half rocky cutting with abundant groundwater. (3) When the parent rocks is possible to produce the dilatability argillaceous rock in the thick soil area, three indexes of the expansive soil should be distinguished to determines the soil nature for providing the reliable basis for the design and construction. (4) For high slope and deep cutting surveys, the exploration points should be rationally arranged according to concrete topographical conditions and the control sections should be properly arranged. In addition, the transverse width of the survey should be increased. ( 5 ) The result can be widely applied in the survey and construction of high slope and deep road bed of railway and highway．
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2013, Vol. 30 
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