基于CPTU计算特定区域沉桩过程中产生超孔压的计算公式

A formula of excess porewater pressure during pile instalition by piezocone test in particular area

PHC桩施工会引起地基土超孔隙水压力的变化,从而导致土中有效应力降低,影响成桩质量以及工程安全,因此在现场施工前常先进行PHC试桩以对地基土性质等进行评价。另一方面,孔压静力触探(CPTU)在岩土工程领域应用得越来越广泛,将PHC试桩与CPTU结合应用于工程实践是未来的发展趋势。本文在前人的成果上进一步分析研究,提出针对连云港地区的超孔压计算公式,并通过工程实例加以验证,对比发现理论计算值与监测值基本吻合。研究成果对该地区工程实践具有一定的指导意义。

The change of excess pore water pressure that caused by the construction of PHC pile, results in the reduction of effective soil stress, and it＇s harmful to the quality of piles and the safety of the construction. So the test piles are often used to evaluate the propertities of the soil before construction. On the other hand, the CPTU applications become increasingly widespread in geotechnical engineering. The combination of PHC test pile and CPTU is the future trend of development. This paper proposes a formula for excess pressure in Lianyungang region through the further analysis of the results of previous research. And the comparison between the theoretical values and the monitoring data, which was verified by engineering examples, shows that these two kinds of values are consistent. The research results of this paper have certain guiding significance for the engineering practice.