用离心模型研究港区软基变形特性

利用目前国内土工离心机中最大的内净空尺寸模型箱和 4 0 0gt大型离心机进行了港区软弱地基离心模型试验研究 ,模拟了堆场 (与码头连接段 )及下卧层在厚达 2 8m吹填粉细砂和 5 5kN m2 使用荷载作用下的沉降量、沉降差及沉降量与时间的关系 ,并测试吹填砂本身的压缩沉降量及不同深度的密实度、压缩模量和承载力变化等。试验结果表明 ,大型离心机模型试验是研究上述工程问题的有效手段 ,所得结论对合理确定地基处理方案、加固处理深度和加固程度以及吹填砂所需方量具有参考价值和指导意义。

STUDY ON DEFORMATION CHARACTERISTICS OF PORT FOUNDATION BY CENTRIFUGAL MODEL

By means of the current largest model box in domestic geotechnical centrifuges a nd 400gt centrifuge, the foundation of cargo field and its substratum have been studied. The deformation process under 28m thick silty sand fill and 55kN/m 2 working load,the time-settlement curve, as well as the compressive deformation, density, modulus of compressibility and bearing capacity of filled sand itself along depth were simulated and predicted. It is indicated that the centrifuge te st results have guidable significance to reasonable determining of both cubic me tre of filled sand and the scheme, the depth and the degree of soil improvement.