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Full-Text Articles in Civil and Environmental Engineering
Penetration Resistance Evolution Characteristics And Mesoscopic Mechanism Of Submarine Pipeline In Sandy Seabed, Yang Yang, Ying-Hui Tian, Chun-Hui Zhang, Rong Wang, Zhi-Chao Wang, Le Wang
Penetration Resistance Evolution Characteristics And Mesoscopic Mechanism Of Submarine Pipeline In Sandy Seabed, Yang Yang, Ying-Hui Tian, Chun-Hui Zhang, Rong Wang, Zhi-Chao Wang, Le Wang
Rock and Soil Mechanics
Understanding the vertical penetration process of submarine pipelines is of fundamental significance for the reasonable assessment of the initial pipeline embedment during installation and safety and stability during service. Geotechnical centrifuge model tests, combined with discrete element method modelling were conducted to investigate penetration resistance evolution characteristics and mesoscopic mechanism of submarine pipeline in sand with different densities under the real stress level. The test results show that for the medium-dense sand, the pipe penetration resistance−embedment curve shows a hardening trend. On the other hand, for the dense sand, the pipe penetration resistance−embedment curve exhibits a periodic softening trend; moreover, …
Discrete Element Simulation And Experimental Study On The Initiation Pressure Of Hydraulic Fracturing, Dong Qi, Wang Yuan, Feng Di
Discrete Element Simulation And Experimental Study On The Initiation Pressure Of Hydraulic Fracturing, Dong Qi, Wang Yuan, Feng Di
Rock and Soil Mechanics
Predicting the initiation pressure of hydraulic fracturing is of great significance for oil and gas exploitation, in-situ stress measurement, and anti-cracking design of hydraulic structures. In this paper, the discontinuous numerical simulation method of particle discrete element combined with domain–pipe flow model is applied considering the fluid–solid coupling. Based on the front-advancing method, the granular model with a regular-shaped borehole is generated to analyze the meso cracking process and initiation pressure of hydraulic fracturing. According to the simulation results, the distribution of contact force chain on the borehole wall is consistent with the theoretical solution on the basis of eliminating …