高应力水平下深部密实石英砂层中的静力触探原位试验或模型试验数据极少,静力触探试验结果与深部密实砂层工程性质间的相关性难以建立。本研究使用高压标定罐以砂雨法制备不同相对密实度的密实砂样,并在不同的高应力水平下开展了静力触探标定罐试验。同时,本研究运用修正摩尔库伦本构模型描述试验过程中高应力水平下密实石英砂的应力-应变响应,使用任意拉格朗日-欧拉大变形有限元方法避免网格畸变,对静力触探试验进行数值模拟,总结所得锥尖贯入阻力结果,拟合得出高应力水平下深部密实石英砂层相对密实度预测公式。将公式预测结果与已有标定罐试验结果对比,发现预测效果较好,相对误差小于30%。

Currently, there is a lack of in-situ or model test results for cone penetration tests conducted in deep dense sand layers under high overburden stresses, restricting the development of empirical relationships between cone penetration test results and the characteristics of such deep dense sand layers. This study addresses this gap by proposing an empirical relationship to predict the relative density of dense silica sand based on stress level and cone tip resistance. The relationship is developed through cone penetration tests performed in a calibration chamber using dense sand specimens subjected to high stresses, along with numerical simulations employing the large deformation finite element method. The Arbitrary Lagrangian Eulerian method was employed to regularly regenerate the mesh to prevent soil element distortion around the cone tip. Additionally, the modified Mohr-Coulomb model was integrated to capture the stress-strain behavior of dense silica sand under high stresses. The empirical relationship provides predictions with acceptable accuracy, as the discrepancies between the predicted and measured relative density values fall within ±30%.

TU411.93

国家自然科学基金项目（面上项目，重点项目，重大项目）（No. 42025702 及 52394251）