旋转触探在天津某铁路特大桥勘察中的应用  

Application of Rotational Cone Penetration in Geological Exploration for A Large Bridge in Tianjin

作　　者：高延霞[1] 高秀梅[1] 

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300142

出　　处：《铁道工程学报》2013年第2期39-43,共5页Journal of Railway Engineering Society

摘　　要：研究目的:目前在天津、华北平原等地区铁路勘察中采用的外业勘察手段主要为钻探、触探,而常规的双桥触探对于埋深大于35 m的密实的粉土及砂土层很难穿透,深部土层物理力学指标的取得主要以钻探取样及标贯为主。触探孔深已经不能满足现阶段的铁路桥梁及深厚软土路基沉降检算等工程设计需要,寻求能够应用于较硬、较深地层的连续、快速、准确、无扰动的静力触探技术是岩土测试技术研究的新方向。研究结论:(1)在天津南港铁路某特大桥勘察中采用的新型旋转触探技术,孔深达到了80 m,克服了常规的静力触探孔不能穿透厚层硬层、测试深度较浅的缺点,满足了设计要求;(2)旋转触探是一种可用于铁路及高层建筑等工程的深层原位测试方法。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 35 m. 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 80 m. The application showed this technology overcame the conventional static cone penetration testg 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.

关 键 词：原位测试 静力触探试验 旋转触探试验 

分 类 号：TU471[建筑科学—结构工程]