郑州浅部特征土数值模拟与试验研究

Numerical simulation and experimental study on Zhengzhou shallow characteristic soil

郑州地区浅部正常固结特征土(粉土)地层较厚,成层相对稳定,承载力相对较高,浅表层黄河冲积软土层承载力较低,大多不能满足多层建(构)筑物负荷要求,因此地基处理时常选取特征土层为主要持力层。结合奥兰花园项目多种原位测试成果,采用颗粒流模拟直接剪切试验和三轴剪切试验,贴合特征土实际情况,建立特征土静三轴破坏方程,有针对性进行反演对比分析,验证了数值模拟破坏方程反演参数的一致性。研究成果深入分析特征土,对其充分合理利用提供了便利。

The shallow normal consolidated characteristic soil(silty soil)in Zhengzhou area has relatively thick stratum,relatively stable stratification and relatively high bearing capacity,while the shallow alluvial soft soil of the Yellow River has relatively low bearing capacity,and most of it cannot meet the load requirements of multi-layer construction(structure).Therefore,the characteristic soil layer is often selected as the main bearing layer in foundation treatment.Combined with the results of various in-situ tests of Olan garden project,the direct shear test and triaxial shear test of particle flow simulation were used to establish the static triaxial equation for failure of characteristic soil,and the inversion comparison analysis was carried out to verify the consistency of the inversion parameters of the numerical simulation failure equation.The research results provide convenience for the full utilization of characteristic soil.