In practical engineering,due to the noncontinuity characteristics of joints in rock slopes,in addition to plane failure,stepped sliding failure may occur for intermittently jointed rock slopes.Especially for intermitt...In practical engineering,due to the noncontinuity characteristics of joints in rock slopes,in addition to plane failure,stepped sliding failure may occur for intermittently jointed rock slopes.Especially for intermittently bedding jointed rock slopes,the correlation and difference in strength parameters between joints and rock bridges,along with the various failure modes and intermittency of rock bridges,contribute to the complexity of stepped failure modes and the unpredictability of failure regions.Based on the upper-bound limit analysis method and multi-sliders step-path failure mode,considering the shear and tensile failure of rock bridges and the weakened relationship between the strength parameters of rock bridges and jointed surfaces,by introducing the modified M-C failure criterion and the formula for calculating the energy consumption of tensile failure of rock bridges,two failure mechanisms are constructed to obtain the safety factor(F_(s))of intermittently jointed rock slopes.The sequential quadratic programming method is used to obtain the optimal upper-bound solution for F_(s).The influence of multiple key parameters(slope height H,horizontal distance L,Slope angleβ,shear strength parameters of the rock bridgeφr and cr,Dimensionless parameter u,weakening coefficients of the internal friction angle and cohesion between the rock bridges and joint surfaces Kφand Kc)on the stability analysis of intermittently jointed rock slopes under the shear failure mode of rock bridges as well as under the tensile failure mode is also explored.The reliability of the failure mechanisms is verified by comparative analysis with theoretical results,numerical results,and landslide cases,and the variation rules of F_(s)with each key parameter are obtained.The results show that F_(s) varies linearly withφr and cr of the rock bridge and with K_(φ)and K_(c),whereas F_(s)changes nonlinearly with H and L.In particular,with the increase in Kφand Kc,Fs increases by approximately 52.78%and 171.02%on average,respectively.For rock bridge tensile failure,F_(s) shows a nonlinearly positive correlation withφr,cr,Kφand Kc.In particular,with the increase in Kφand Kc,Fs increases by approximately 13%and 61.69%on average,respectively.Fs decreases rapidly with increasing slope gradientβand decreasing dimensionless parameterμ.When Kφand Kc are both less than 1.0,the stepped sliding surface occurs more easily than the plane failure surface,especially in the case of tensile failure of the rock bridge.In addition,rock slopes with higher strength parameters,taller heights,and greater weakening coefficients are prone to rock bridge tension failure with lower Fs,and more attention should be given to the occurrence of such accidents in actual engineering.展开更多
目的：采用同位素相对标记与绝对定量技术（TMT）联合二维液相色谱-串联质谱（2D-LC-MS/MS）,筛选系统性红斑狼疮（Systemic Lupus Erythematosus,SLE）合并激素性股骨头坏死（steroid induced osteonecrosis of the femoral head,SONF...目的：采用同位素相对标记与绝对定量技术（TMT）联合二维液相色谱-串联质谱（2D-LC-MS/MS）,筛选系统性红斑狼疮（Systemic Lupus Erythematosus,SLE）合并激素性股骨头坏死（steroid induced osteonecrosis of the femoral head,SONFH）筋脉瘀滞证、肝肾亏虚证患者与健康人之间的血清差异蛋白质,初步寻找出两种不同证型的潜在生物学标志物。方法：分别收集SONFH筋脉瘀滞证患者、肝肾亏虚证患者及健康人各5例血清,应用TMT联合2D-LC-MS/MS检测技术,寻找并鉴定差异表达的蛋白质。结果：共筛选出IGHV3-7、IGHV1OR15-1、ABCB9、FGB、F13A1、FGG、FGA SAA1、ACTB、CRP共10个表达差异倍数在两倍以上显著表达的蛋白质。其中IGHV3-7、IGHV1OR15-1、ABCB9、FGB、F13A1、FGG、FGA筋脉瘀滞组中显著表达;SAA1、ACTB、CRP肝肾亏虚组中显著表达。结论：IGHV3-7、IGHV1OR15-1、ABCB9、FGB、F13A1、FGG、FGA可能是SLE合并SONFH筋脉瘀滞证潜在的血清特异性蛋白标志物;SAA1、ACTB、CRP可能是SLE合并SONFH肝肾亏虚证潜在的血清特异性蛋白标志物。展开更多
基金supported by the National Natural Science Foundation of China(Nos.52208369,52309138,52209142,51978666)the Department of Science and Technology of Sichuan Province(2023NSFSC0284).
文摘In practical engineering,due to the noncontinuity characteristics of joints in rock slopes,in addition to plane failure,stepped sliding failure may occur for intermittently jointed rock slopes.Especially for intermittently bedding jointed rock slopes,the correlation and difference in strength parameters between joints and rock bridges,along with the various failure modes and intermittency of rock bridges,contribute to the complexity of stepped failure modes and the unpredictability of failure regions.Based on the upper-bound limit analysis method and multi-sliders step-path failure mode,considering the shear and tensile failure of rock bridges and the weakened relationship between the strength parameters of rock bridges and jointed surfaces,by introducing the modified M-C failure criterion and the formula for calculating the energy consumption of tensile failure of rock bridges,two failure mechanisms are constructed to obtain the safety factor(F_(s))of intermittently jointed rock slopes.The sequential quadratic programming method is used to obtain the optimal upper-bound solution for F_(s).The influence of multiple key parameters(slope height H,horizontal distance L,Slope angleβ,shear strength parameters of the rock bridgeφr and cr,Dimensionless parameter u,weakening coefficients of the internal friction angle and cohesion between the rock bridges and joint surfaces Kφand Kc)on the stability analysis of intermittently jointed rock slopes under the shear failure mode of rock bridges as well as under the tensile failure mode is also explored.The reliability of the failure mechanisms is verified by comparative analysis with theoretical results,numerical results,and landslide cases,and the variation rules of F_(s)with each key parameter are obtained.The results show that F_(s) varies linearly withφr and cr of the rock bridge and with K_(φ)and K_(c),whereas F_(s)changes nonlinearly with H and L.In particular,with the increase in Kφand Kc,Fs increases by approximately 52.78%and 171.02%on average,respectively.For rock bridge tensile failure,F_(s) shows a nonlinearly positive correlation withφr,cr,Kφand Kc.In particular,with the increase in Kφand Kc,Fs increases by approximately 13%and 61.69%on average,respectively.Fs decreases rapidly with increasing slope gradientβand decreasing dimensionless parameterμ.When Kφand Kc are both less than 1.0,the stepped sliding surface occurs more easily than the plane failure surface,especially in the case of tensile failure of the rock bridge.In addition,rock slopes with higher strength parameters,taller heights,and greater weakening coefficients are prone to rock bridge tension failure with lower Fs,and more attention should be given to the occurrence of such accidents in actual engineering.
文摘目的：采用同位素相对标记与绝对定量技术（TMT）联合二维液相色谱-串联质谱（2D-LC-MS/MS）,筛选系统性红斑狼疮（Systemic Lupus Erythematosus,SLE）合并激素性股骨头坏死（steroid induced osteonecrosis of the femoral head,SONFH）筋脉瘀滞证、肝肾亏虚证患者与健康人之间的血清差异蛋白质,初步寻找出两种不同证型的潜在生物学标志物。方法：分别收集SONFH筋脉瘀滞证患者、肝肾亏虚证患者及健康人各5例血清,应用TMT联合2D-LC-MS/MS检测技术,寻找并鉴定差异表达的蛋白质。结果：共筛选出IGHV3-7、IGHV1OR15-1、ABCB9、FGB、F13A1、FGG、FGA SAA1、ACTB、CRP共10个表达差异倍数在两倍以上显著表达的蛋白质。其中IGHV3-7、IGHV1OR15-1、ABCB9、FGB、F13A1、FGG、FGA筋脉瘀滞组中显著表达;SAA1、ACTB、CRP肝肾亏虚组中显著表达。结论：IGHV3-7、IGHV1OR15-1、ABCB9、FGB、F13A1、FGG、FGA可能是SLE合并SONFH筋脉瘀滞证潜在的血清特异性蛋白标志物;SAA1、ACTB、CRP可能是SLE合并SONFH肝肾亏虚证潜在的血清特异性蛋白标志物。
