深海浅表层沉积物不排水剪切强度的多探头原位测试系统及评价方法研究  

MULTI-PROBE IN-SITU TESTING SYSTEM AND EVALUATION METHOD FOR UNDRAINED SHEAR STRENGTH OF DEEP-SEA SHALLOW SEDI-MENTS

作　　者：谷忠德 郭兴森 赵维[1] 王兴 刘晓磊 郑敬宾 刘敬喜 贾永刚 年廷凯[1] GU Zhongde;GUO Xingsen;ZHAO Wei;WANG Xing;LIU Xiaolei;ZHENG Jingbin;LIU Jingxi;JIA Yonggang;NIAN Tingkai(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Suzhou Nanzee Sensing Technology Co.,Ltd.,Suzhou 215127,China;Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering,Ocean University of China,Qingdao 266100,China;Shandong Tuopu Hydraulic Pneumatic Co.,Ltd.,Jinan 250107,China)

机构地区：[1]大连理工大学,海岸和近海工程国家重点实验室,大连116024 [2]苏州南智传感科技有限公司,苏州215127 [3]中国海洋大学,山东省海洋环境地质工程重点实验室,青岛266100 [4]山东拓普液压气动有限公司,济南250107

出　　处：《工程地质学报》2021年第6期1949-1955,共7页Journal of Engineering Geology

基　　金：国家重点研发计划项目(资助号:2018YFC0309200);国家自然科学基金(资助号:51879036);辽宁省兴辽英才计划项目(资助号:XLYC2002036).

摘　　要：海洋工程建设已步入深海,但与之匹配的浅表层沉积物不排水剪切强度原位测试技术尚不成熟。为此,本文开发了可用于评估深海浅表层沉积物土力学性质的多探头原位测试系统,包括锥形触探仪、球形贯入仪和十字板剪切仪,可实现对深海沉积物土力学性质的快速、准确和智能化评价。进一步,通过CEL大变形数值模拟和足尺土工模型试验确定锥形触探仪的锥尖阻力系数,基于离心模型试验给出球形贯入仪的贯入阻力系数,从而完善深海浅表层沉积物不排水剪切强度的评价方法;在此基础上,探讨3种特定仪器各自适合的强度测试区间。结果表明:对于深海浅表层沉积物不排水剪切强度的评估,锥形触探仪和球形贯入仪的阻力系数建议分别取值为9.5和11.1。Ocean engineering has moved towards the deep sea.But in-situ testing technology for undrained shear strength of deep sea shallow sediments is not yet mature.This paper develops a multi-probe in-situ test system that can evaluate the soil mechanical properties of deep-sea shallow sediments.It includes CPT,Ball Full-flow Penetrometer and VST to achieve a rapid,accurate and intelligent evaluation of the soil mechanical properties of deep-sea shallow sediments.Further the resistance coefficient of CPT is determined with CEL large-deformation numerical analysis method and the full-scale geotechnical model test,and the resistance coefficient of Ball Full-flow Penetrometer is given by the centrifugal model test.Then the undrained shear strength evaluation method of deep sea shallow sediments is improved.On this basis,the undrained shear strength test intervals suitable for each of the instruments are discussed.Results indicate that for the evaluation of the deep-sea shallow saturated soft clay undrained shear strength,the recommended penetration coefficients of CPT and Ball Full-flow Penetrometer are respectively 9.5 and 11.1.

关 键 词：锥形触探仪 球形贯入仪 十字板剪切仪 深海浅表层沉积物 不排水剪切强度 评价方法 测试区间 

分 类 号：P67[天文地球—海洋地质]