经肛门全直肠系膜切除术（transanal total mesorectal excision．taTME）是经肛门途径，在内镜或腔镜下自下而上地游离直肠系膜而进行完全直肠系膜切除术的新术式。对于部分中低位直肠癌患者。taTME具有一定优势，可能提高手术质量并...经肛门全直肠系膜切除术（transanal total mesorectal excision．taTME）是经肛门途径，在内镜或腔镜下自下而上地游离直肠系膜而进行完全直肠系膜切除术的新术式。对于部分中低位直肠癌患者。taTME具有一定优势，可能提高手术质量并减少副损伤。一系列临床研究显示了其手术的安全性、可行性和令人鼓舞的短期疗效。展开更多
Based on the compression mechanism for analyzing the cavity expansion problem in soil under high stresses,generalized non-linear failure criterion and large strain and energy conservation in plastic region during the ...Based on the compression mechanism for analyzing the cavity expansion problem in soil under high stresses,generalized non-linear failure criterion and large strain and energy conservation in plastic region during the cavity expanding were adopted.The energy conservation equation was established and the limited pressure of cavity expansion under high stresses was given based on the energy dissipation analysis method,in which the energy generated from cavity expansion is absorbed by the volume change and shear strain caused in soil.The factors of large strain and dilatation were considered by the proposed method.The analysis shows that the limited pressure is determined by failure criterion,stress state,large deformation characteristic,dilatation and strength of soil.It is shown from the comparison that the results with the proposed method approximate to those of the in-situ method.The cavity expansion pressure first decreases and then increases nonlinearly with both of shear modulus and dilatation increasing.展开更多
文摘经肛门全直肠系膜切除术（transanal total mesorectal excision．taTME）是经肛门途径，在内镜或腔镜下自下而上地游离直肠系膜而进行完全直肠系膜切除术的新术式。对于部分中低位直肠癌患者。taTME具有一定优势，可能提高手术质量并减少副损伤。一系列临床研究显示了其手术的安全性、可行性和令人鼓舞的短期疗效。
基金Projects(2010RS4016,10JJ60708) supported by Hunan Provincial Science Foundation,ChinaProjects(201018,201108,201121) supported by Hunan Provincial Transportation Science and Technology Progress and Innovation Plan of China
文摘Based on the compression mechanism for analyzing the cavity expansion problem in soil under high stresses,generalized non-linear failure criterion and large strain and energy conservation in plastic region during the cavity expanding were adopted.The energy conservation equation was established and the limited pressure of cavity expansion under high stresses was given based on the energy dissipation analysis method,in which the energy generated from cavity expansion is absorbed by the volume change and shear strain caused in soil.The factors of large strain and dilatation were considered by the proposed method.The analysis shows that the limited pressure is determined by failure criterion,stress state,large deformation characteristic,dilatation and strength of soil.It is shown from the comparison that the results with the proposed method approximate to those of the in-situ method.The cavity expansion pressure first decreases and then increases nonlinearly with both of shear modulus and dilatation increasing.
