静力触探在海底土层工程性质评价中的应用研究

发布时间：2018-10-05 10:54

【摘要】：随着海底隧道建设、海岸带开发、港湾建设和其他海洋资源的开发,静力触探技术(CPT)作为原位测试技术的一种,在海洋工程地质勘查中发挥着越来越重要的作用。现场进行静力触探试验以及室内试验,分析某海上场址工程中土的物理、力学性质的特点,通过对比分析对土层的抗剪强度、灵敏度和超固结比(OCR)进行评价。CPT测试数据显示当地层发生变化时,锥尖阻力(qc)和孔隙水压力(fs)会发生较大变化。对于较硬的黏土层,静力触探结果可能出现较大误差,土性参数评价时需要予以剔除。使用CPT测试数据对该场址地基土不排水抗剪强度、灵敏度和超固结比(OCR)进行评价时,其各自参数分别为:Nkt取15,Ns取6以及k值取0.3时,CPT测得不排水抗剪强度、灵敏度和超固结比与室内试验吻合较好。
[Abstract]:With the development of submarine tunnel, coastal zone development, harbour construction and other marine resources, (CPT), as a kind of in-situ testing technology, is playing an increasingly important role in marine engineering geological exploration. The static penetration test and indoor test were carried out on the spot to analyze the characteristics of the physical and mechanical properties of the soil in the engineering of a certain offshore site, and the shear strength of the soil layer was compared and analyzed. The sensitivity and overconsolidation ratio (OCR) were evaluated. CPT data showed that the cone tip resistance (qc) and pore water pressure (fs) would change greatly when the local layer changed. For the hard clay layer, there may be a large error in the static penetration test results, which should be eliminated when evaluating the soil properties parameters. When the undrained shear strength, sensitivity and over-consolidation ratio (OCR) of the ground soil are evaluated by using the CPT test data, the undrained shear strength measured by the CPT is obtained when the ratio of undrained shear strength, sensitivity and over-consolidation ratio of the ground soil is: 1% Nkt, 15 N s, 6, and 0.3 k, respectively. The sensitivity and the over consolidation ratio are in good agreement with the laboratory test.
【作者单位】：中国地质大学(北京)工程技术学院;国土资源部深部地质钻探技术重点实验室;
【基金】：国家科技支撑计划项目(2015BAD20B02) 国家自然科学基金面上项目(41572360)资助
【分类号】：P75;TU413

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