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Numerical simulation of mechanisms of deformation,failure and energy dissipation in porous rock media subjected to wave stresses

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Science china(Technological Sciences) 2010年第4期53卷 1098-1113页

作者： ju yang1,2.wang huijie1,yang yongming1,hu qinang3 & peng ruidong1 1 state key laboratory of coal resources and safe mining,beijing key laboratory of fracture and damage mechanics of rock and concrete,china university of mining and technology,beijing 100083,china 2 Department of Mechanical and Manufacturing Engineering,university of Calgary,Calgary,Alberta,T2N 1N4,Canada 3 School of Environment and Civil Engineering,College of Engineering,Oklahoma state university,Stillwater,OK 74078,USA 1. state key laboratory of coal resources and safe mining Beijing Key Laboratory of Fracture and Damage Mechanics of Rock and Concrete China University of Mining and Technology Beijing 100083 China2. Department of Mechanical and Manufacturing Engineering University of Calgary Calgary Alberta T2N 1N4 Canada3. School of Environment and Civil Engineering College of Engineering Oklahoma State University Stillwater OK 74078 USA

The pore characteristics,mineral compositions,physical and mechanical properties of the subarkose sandstones were acquired by means of CT scan,X-ray diffraction and physical tests.A few physical models possessing the same pore characteristics and matrix properties but different porosities compared to the natural sandstones were *** 3D finite element models of the rock media with varied porosities were established based on the CT image processing of the physical models and the MIMICS software *** failure processes of the porous rock media loaded by the split Hopkinson pressure bar(SHPB) were simulated by satisfying the elastic wave propagation *** dynamic responses,stress transition,deformation and failure mechanisms of the porous rock media subjected to the wave stresses were *** is shown that an explicit and quantitative analysis of the stress,strain and deformation and failure mechanisms of porous rocks under the wave stresses can be achieved by using the developed 3D finite element *** applied wave stresses of certain amplitude and velocity,no evident pore deformation was observed for the rock media with a porosity less than 15%.The deformation is dominantly the combination of microplasticity(shear strain),cracking(tensile strain) of matrix and coalescence of the cracked regions around *** stresses lead to microplasticity,while tensile stresses result in cracking of the *** and coalescence of the matrix elements in the neighborhood of pores resulted from the high transverse tensile stress or tensile strain which exceeded the threshold *** simulation results of stress wave propagation,deformation and failure mechanisms and energy dissipation in porous rock media were in good agreement with the physical *** present study provides a reference for analyzing the intrinsic mechanisms of the complex dynamic response,stress transit mode,deformation and failure mechanisms and the disaster mechanism

关键词： porous media three-dimensional finite element model rock media stress wave failure mechanism energy dissipation

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Chinese Trauma Surgeon Association for management guidelines of vacuum sealing drainage application in abdominal surgeries-Update and systematic review

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Chinese Journal of Traumatology 2019年第1期22卷 1-11页

作者： yang Li Pei-Yuan Li Shi-Jing Sun Yuan-Zhang Yao Zhan-Fei Li Tao Liu Fan yang Lian-yang Zhang Xiang-jun Bai Jing-Shan huo Wu-Bing He jun Ouyang Lei peng Ping hu Yan-An Zhu Ping Jin Qi-Feng Shao Yan-Feng wang Rui-Wu Dai Pei-yang hu Hai-Ming Chen Ge-Fei wang Yong-Gao wang Hong-Xu Jin Chang-ju Zhu Qi-Yong Zhang Biao Shao Xi-Guang Sang Chang-Lin Yin Trauma Center of PLA State Key Laboratory of Trauma Bums and Combined Injury Institute of Surgery Research Doping Hospital Third Military Medical University Chongqing China Ninth People's Hospital of Zhengzhou Zhengzhou China Zhongnan Hospital of Wuhan university Wuhan China Chengdu Military General Hospital ChengduChina Tiantai County People's Hospital Tiantai Zhejiang China The First Affiliated Hospital of Nanchang university Nanchang China Department of Surgery Jinling Hospital Medical School of Nanjing University Nanjing China Department of Surgery The First Affiliated Hospital of Zhejiang Chinese Medical University Hangzhou China Shenyang Military General Hospital Shenyang China The First Affiliated Hospital of Zhengzhou university Zhengzhou China The Affiliated Hospital of Guizhou Medical university Guiyang China Trauma Center/Department of Emergency and Trauma Surgery Tongji Hospital of Tongji Medical College Huazhong University of Science & Technology Wuhan China The First People's Hospital of Kunming Kunming China Qilu Hospital of Shandong university Jinan China The First Affiliated Hospital of Third Military Medical university Chongqing China Foshan Hospital of Traditional Chinese Medicine Foshan Guangzhou Province China Fujian Provincial Hospital Fuzhou China Emergency Surgery of the First Affiliated Hospital Shihezi University School of Medicine Shihezi Xinjiang Autonomous Region China The First Affiliated Hospital of Hainan Medical university Haikou China Chongqing Emergency Medical Center Chongqing China Taizhou Hospital of Zhejiang Province Taizhou Zhejiang Province China Yuyao People's Hospital of Zhejiang Province Yuyao Zhejiang Province China

Vacuum sealing drainage (VSD) is frequently used in abdominal surgeries. However, relevant guidelines are rare. Chin ese Trauma Surge on Associati on orga nized a committee composed of 28 experts across china in july 2017, aiming to provide an evidence-based recommendation for the application of VSD in abdominal *** questions regarding the use of VSD in abdominal surgeries were addressed:(1) which type of materials should be respectively chosen for the intraperitoneal cavity, retroperitoneal cavity and superficial incisions?(2) Can VSD be preventively used for a high-risk abdominal incision w让h primary suture?(3) Can VSD be used in severely contaminated/infected abdominal surgical sites?(4) Can VSD be used for temporary abdominal cavity closure under some special conditions such as severe abdominal trauma, infection, liver transplantation and intra-abdominal volume increment in abdominal compartment syndrome?(5) Can VSD be used in abdominal organ inflammation, injury, or postoperative drainage?(6) Can VSD be used in the treatment of intestinal fistula and pancreatic fistula?(7) Can VSD be used in the treatment of intra-abdominal and extra-peritoneal abscess?(8) Can VSD be used in the treatment of abdominal wall wounds, wound cavity, and defects?(9) Does VSD in crease the risk of bleeding?(10) Does VSD increase the risk of intestinal wail injury?(11) Does VSD increase the risk of peritoneal adhesion? Focusing on these questions, evidence-based recommendations were given accordingly. VSD was strongly recommended regarding the questions 2-4. Weak recommendations were made regarding questions 1 and 5-11. Proper use of VSD in abdominal surgeries can lower the risk of infection in abdominal incisions with primary suture, treat severely contaminated/infected surgical sites and facilitate temporary abdominal cavity closure.

关键词： Guideline Vacuum sealing drainage Abdominal surgery

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