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首页> 外文期刊>Geotechnical testing journal >Development of a Miniature Cone Penetrometer for Calibration Chamber Testing
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Development of a Miniature Cone Penetrometer for Calibration Chamber Testing

机译：微型锥形渗透计的开发，用于校准室测试

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摘要

Cone penetration testing (CPT) has become the industry standard for in situ testing of cohesionless soils, and in particular, field liquefaction evaluation. The empirical methods for the interpretation of CPT data are either based on field data or the observation of CPT measurements in laboratory samples. In this study, a miniature cone penetrometer (with a diameter of 6mm) is developed for understanding the response of loose to medium-dense sands. A modified triaxial cell is used for sample preparation and containment of the sample during cone penetration. The miniature cone can measure cone tip resistance, sleeve friction, and excess pore water pressure developed at the cone tip. While cone tip resistance is measured by a separate load cell, sleeve friction is obtained by subtracting cone tip resistance from a combined measurement of tip resistance and sleeve frictional force. Due to the free-draining nature of the sand tested in this study, no excess pore water pressure is developed during cone penetration. The measured data from the miniature cone are verified by comparison with CPT resistances measured in several other calibration chamber experiments on similar sands. Compared to a large calibration chamber with a standard size cone, the miniature cone allows quicker and less expensive CPT experiments in a more uniform sample.
机译：锥孔渗透测试（CPT）已成为无粘性土壤的原位测试，尤其是现场液化评估的行业标准。解释CPT数据的经验方法是基于现场数据或对实验室样品中CPT测量值的观察。在这项研究中，开发了一种微型锥形渗透仪（直径为6mm），用于了解松散对中等密度砂土的响应。改进的三轴样品池用于样品制备和锥孔穿透过程中的样品容纳。微型锥体可以测量锥体尖端的阻力，套筒摩擦力以及在锥体尖端产生的多余的孔隙水压力。通过单独的称重传感器测量锥顶阻力时，可通过从顶阻和套筒摩擦力的组合测量中减去锥顶阻力来获得套筒摩擦。由于在这项研究中测试的沙子具有自由排水的特性，因此在圆锥体渗透过程中不会产生过多的孔隙水压力。通过与其他几次在类似沙子上的校准室实验中测得的CPT电阻进行比较，验证了来自微型圆锥的测量数据。与具有标准尺寸锥孔的大型校准室相比，微型锥孔可在更均匀的样品中进行更快，更便宜的CPT实验。

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