球形贯入仪预测超固结土强度的数值研究  

Numerical study of ball penetrometer for predicting strength of overconsolidated soils

作　　者：周波翰 张文利 王栋[2] ZHOU Bo-han;ZHANG Wen-li;WANG Dong(PowerChina Huadong Engineering Corporation Limited,Hangzhou,Zhejiang 310030,China;Shandong Engineering Research Center of Marine Exploration and Conservation,Ocean University of China,Qingdao,Shandong 266100,China)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,浙江杭州310030 [2]中国海洋大学海底建设与保护山东省工程研究中心,山东青岛266100

出　　处：《岩土力学》2025年第4期1303-1309,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.42025702,No.52394251)。

摘　　要：与传统的静力触探仪相比,球形贯入仪投影面积大,适合预测黏土的不排水抗剪强度,在海洋岩土勘察中具有显著优势。然而,当球形探头在粉质黏土或黏质粉土中贯入时,探头周围的土可能处于部分排水条件,进而影响贯入阻力。已有研究多集中在正常固结土,还不能考虑部分排水条件与土体超固结比的耦合作用。在此采用有效应力形式的大变形有限元方法,模拟球形探头在超固结土中的长距离贯入过程,对比已有的离心模型试验和现场测试,验证了大变形模拟的可靠性。进而获得球形探头处贯入阻力的骨干曲线,建立超固结土中贯入阻力与部分排水条件的关系。基于大量变动参数分析,提出了利用球形仪在超固结土中贯入阻力预测有效内摩擦角的新方法,其中归一化贯入速度可量化部分排水程度,不再需要量测贯入过程中的孔压。Ball penetrometers are particularly advantageous for predicting the undrained shear strength of clays in marine geotechnical investigations,due to their larger projection area compared to traditional cone penetrometers.However,if the ball penetrates silty clay or clayey silt,the surrounding soil may experience partially drained conditions,which can affect penetration resistance.Previous studies have focused on normally consolidated soils and have not been able to consider the coupling of partial drainage conditions with the overconsolidation ratio.A large deformation finite element method utilizing effective stress is utilized to model the deep penetration of the ball into overconsolidated soils.The reliability of the large deformation simulation was validated by comparing it with centrifuge tests and field measurements.A backbone curve of penetration resistance at the spherical probe is developed,establishing a relationship between penetration resistance and partial drainage conditions in overconsolidated soils.Based on extensive parametric analyses,a novel approach is proposed to predict the effective internal friction angle of overconsolidated soils using penetration resistance data from ball penetration tests.The normalized penetration rate can quantify the degree of partial drainage,eliminating the need to measure pore pressure during penetration.

关 键 词：球形贯入仪 粉质黏土 超固结 有效内摩擦角 大变形有限元 

分 类 号：TU411.3[建筑科学—岩土工程]