Calibration of a Miniature Cone Penetrometer for Highway Applications
Calibration of a Miniature Cone Penetrometer for Highway Applications
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DOI：
10.3141/1614-02
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发表时间：
1998
影响因子：
1.7
通讯作者：
P. Kurup;M. Tumay
中科院分区：
文献类型：
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作者：
P. Kurup;M. Tumay
电子锥形比重计是一种重要的现场调查工具，可用于场地表征。介绍了圆锥贯入试验（CPT）这一成熟概念在小型化公路设计和施工控制中的应用。研制了一种投影锥面积为2cm ~ 2的微型圆锥贯入仪，并将其应用于连续侵入式微型圆锥贯入试验系统（CIMCPT）中。该装置可用于快速、准确和经济地表征场地，并确定路面、路基和土结构设计所需的工程土壤参数。微型圆锥贯入试验（MCPT）比标准的10 cm 2横截面积参考圆锥贯入试验仪提供更精细的细节。这使得MCPT在路基表征、质量控制评估、压实控制和交通基础设施地基改善有效性评估方面具有吸引力。在巴吞鲁日，路易斯安那州的高速公路路堤现场进行CIMCPT系统的现场校准。将MCPT的渗透剖面与在同一地点使用标准锥形渗透仪获得的剖面进行了比较。MCPT的尖端电阻比参考CPT的尖端电阻高10%。参比CPT的套管摩擦力和摩擦比分别比MCPT高12%和23%。还进行了校准，以确定经验锥系数估计不排水抗剪强度从MCPT数据。
The electronic cone penetrometer is an important in situ investigation tool of choice for site characterization. Application of this proven concept of the cone penetration test (CPT) to highway design and construction control by miniaturization is described. A miniature cone penetrometer with a projected cone area of 2 cm2 has been developed and implemented in a continuous intrusion miniature cone penetration test system (CIMCPT). This device may be used for rapid, accurate, and economical characterization of sites and to determine engineering soil parameters needed in the design of pavements, embankments, and earth structures. The miniature cone penetration test (MCPT) gives finer details than the standard 10-cm2 cross-sectional area reference cone penetrometer. This makes the MCPT attractive for subgrade characterization, quality-control assessment, compaction control of embankments, and assessment of ground improvement effectiveness for transportation infrastructure. In situ calibration of the CIMCPT system was conducted at a highway embankment site in Baton Rouge, Louisiana. MCPT penetration profiles were compared with those obtained by using the standard cone penetrometer at the same site. The tip resistance of the MCPT was 10 percent higher than that of the reference CPT. The sleeve friction and friction ratio of the reference CPT were higher than that of the MCPT by 12 and 23 percent, respectively. Calibration was also performed to determine empirical cone factors required for estimating undrained shear strength from MCPT data.