扁铲侧胀试验在滨海沉积软土中的应用

Application of flat Dilatometer Test in littoral deposit soft soil

通过运用扁铲侧胀仪(DMT)在长江入海口滨海沉积软土中进行的原位测试,获得滨海沉积软土中扁铲侧胀试验各指标参数的变化规律。扁铲侧胀试验与静力触探试验结果一致,试验结果可靠,且扁铲侧胀试验可以快速地获取侧向基床反力系数KH,为桩基础的设计提供可靠的依据。对比旁压试验结果,扁铲侧胀试验得到的KH值常常偏大。在粘土层、粘质粉土夹粉质粘土、淤泥质粉质粘土、粘质粉土、淤泥质粘土等土层中KH与真实值相差较小,可以使用,但实际应用中应同时结合规范使用;而在砂质粉土和粉砂等土层中KH与真实值相差较大,不宜使用。

The law of dilatometer test parameters is got from the in-situ test of flat Dilatometer Miriam （DMT） at the estuario of Yangtze River soft soil in coastal sediments. DMT results agree with Static Cone Penetration Test,and DMT can get the lateral coefficient of subgrade reaction KH quickly for the design of pile foundation and provide reliable data. Contrast with pressuremeter test, DMT test value is often larger. In clay layer, silty clay including clayey silt, muddy silty clay, clayey silt and muddy clay, KH is less different from the real value, it can be used in those soil. While in sandy soil and powder sand, it has a significant difference from the real value, so it not unfavorable use in such soil.