Abstract：Research purposes: At present, the drilling and cone penetration are used for the geological exploration for railway in the areas of Tianjin and North China Plain. However, the conventional double penetration is difficult to penetrate the compacted silt and sand layer with burred depth of more than of 35m. The mechanical properties of the deep soil are obtained mainly by the drilling sampling and standard penetration test. The boring hole depth can not meet the needs of the design of the current railway bridge and inspection and calculation of the settlement of the soft soil subgrade. To seek the continuously, rapidly and accurately static cone penetration test technology featured with no disturbance and being used for the hard and deep stratum is the new research direction on the geotechnical testing technology.
Research conclusions: With the new rotational penetration test technology applied in survey for a super big railway bridge in Nangang of Tianjin, the penetration depth reached at 80m. The application showed this technology overcame the conventional static cone penetration tests demerits, such as unable to penetrate the hard and deep stratum and the shallow testing depth, met the needs of the engineering design and the rotational cone penetration was an in-site test method available for railway and the high-rise building.
高延霞,高秀梅. 旋转触探在天津某铁路特大桥勘察中的应用[J]. 铁道工程学报, 2013, 30(2): 39-43.
GAO Yan-xia, GAO Xiu-mei. Application of Rotational Cone Penetration in Geological Exploration for A Large Bridge in Tianjin. 铁道工程学报, 2013, 30(2): 39-43.
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2013, Vol. 30 
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