Abstract：Research purposes: A systematic study on pressure meter results based on geotechnical investigation of Xi'an subway No 3 Line in loess area，analysis of a reasonable method for calculating lateral pressure coefficient and horizontal foundation coefficient by the curves of pressure meter in loess area，the objective is to get accurate coefficients，and provide theoretical basis for scientifically analyzing mechanical characteristics of subway tunnel lining and design parameters.
Research conclusions:(1)The lateral pressure coefficient results of pressure meter test are quite close to that of traditional method，the result did not change significantly with depth arden，and pressure meter test takes the advantages of simple operation and economical compared with other methods，therefore it is perfectly suitable for geotechnical in-situ test in loess area.(2)The result of pressure meter test has suggested the change of horizontal foundation coefficient with soil，the soil limit pressure and deformation property parameters can be measured by pressure meter test. But it should be multiplied by 0. 3～0. 5 in calculation of horizontal foundation coefficient when used in parameter design of tunnel lining.(3)The research results will provide theoretical support for reasonable design of subway tunnel lining in loess area.
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