Determination of confined compression modulus of soft clay using piezocone penetration tests
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摘要: 回顾了采用孔压静力触探（CPTU）测试参数确定压缩模量（Es）的现有方法,并在江苏选择3个高速公路软土场地进行了CPTU试验,以高质量原状土样固结试验得到的Es值作为参考值评估了各经验方法的预测有效性,进而提出了新的江苏典型软土锥尖阻力-压缩模量Es相关关系；同时采用不同CPTU测试参数计算的Es值预测了某条高速公路软基的沉降量,并和现场沉降观测值进行了比较,结果表明：基于净锥尖阻力qn的Senneset（1989）方法能够很好的预测Es值；同样,基于CPTU测试参数预测的高速公路软基沉降量也接近于现场实测沉降,验证了应用CPTU确定软土Es值进而预测软基沉降的可靠性。 方法 方法Abstract: The existing interpretation methods for piezocone penetration tests (CPTU) are reviewed for prediction of the constrained compression modulus (Es). Three expressway sites in Jiangsu Province are selected for this study. In each site, CPTU tests are performed supplemented by consolidation tests using high-quality undisturbed soft soil samples. Then, Es-predicted methods based on the CPTU tests are compared and evaluated. The new correlations are also developed to predict the values of Es from the cone tip resistance (qc), corrected cone tip resistance (qt) and net cone tip resistance (qn) for soft clay in Jiangsu Province. Furthermore, the correlations are verified by comparing the total settlements predicted from CPTU and the measured settlements for one selected expressway site. The results show that the Senneset et al（1989）method based on the net cone resistance is able to predict Es better than the other methods. The predicted total settlements based on CPTU parameters show a better agreement with the measured ones. Accordingly, the reliability of the application of CPTU for Es and settlement prediction is verified.
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Keywords:
- piezocone penetration test /
- soft clay /
- compression modulus /
- settlement prediction
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