Stress Path Analysis of Deep-Sea Sediments Under the Compression-Shear Coupling Load of Crawler Collectors  

作　　者：ZHANG Ning MA Ning YIN Shiyang CHEN Xuguang SONG Yuheng 

机构地区：[1]School of Water Resources and Hydropower Engineering,North China Electric Power University,Beijing 102206,China [2]Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering,Ocean University of China,Qingdao 266100,China [3]Laboratory for Marine Geology,Qingdao National Laboratory for Maine Science and Technology,Qingdao 266100,China

出　　处：《Journal of Ocean University of China》2023年第1期65-74,共10页中国海洋大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.U1906234,51822904,51579082);the Fundamental Research Funds for the Central Universities(No.2020MS027).

摘　　要：The mechanical properties of deep-sea sediments during the driving process of crawler collectors are essential factors in the design of mining systems.In this study,a crawler load is divided into a normal compression load and a horizontal shear load.Then,the internal stress state of sedimentary soil is examined through a theoretical calculation and finite element numerical simulation.Finally,the driving of crawlers is simulated by changing the relative spatial position between the load and stress unit,obtaining the stress path of the soil unit.Based on the calculation results,the effect of the horizontal shear load on the soil stress response is analyzed at different depths,and the spatial variation law of the soil stress path is examined.The results demonstrate that the horizontal shear load has a significant effect on the rotation of the principal stress,and the reverse rotation of the principal stress axis becomes obvious with the increase in the burial depth.The stress path curve of the soil is different at various depths.The spatial variation rule of the stress path of the shallow soil is complex,whereas the stress path curve of the deep soil tends to shrink as the depth increases.The stress path of the corresponding depth should be selected according to the actual research purpose and applied to the laboratory test.

关 键 词：deep-sea sediment crawler collector compression-shear coupling load stress path principal stress axis direction 

分 类 号：P716.7[天文地球—海洋科学]