The Fort d’Issy-Vanves-Clamart(FIVC)braced excavation in France is analyzed to provide insights into the geotechnical serviceability assessment of excavations at great depth within deterministic and probabilistic fra...The Fort d’Issy-Vanves-Clamart(FIVC)braced excavation in France is analyzed to provide insights into the geotechnical serviceability assessment of excavations at great depth within deterministic and probabilistic frameworks.The FIVC excavation is excavated at 32 m below the ground surface in Parisian sedimentary basin and a plane-strain finite element analysis is implemented to examine the wall deflections and ground surface settlements.A stochastic finite element method based on the polynomial chaos Kriging metamodel(MSFEM)is then proposed for the probabilistic analyses.Comparisons with field measurements and former studies are carried out.Several academic cases are then conducted to investigate the great-depth excavation stability regarding the maximum horizontal wall deflection and maximum ground surface settlement.The results indicate that the proposed MSFEM is effective for probabilistic analyses and can provide useful insights for the excavation design and construction.A sensitivity analysis for seven considered random parameters is then implemented.The soil friction angle at the excavation bottom layer is the most significant one for design.The soil-wall interaction effects on the excavation stability are also given.展开更多
目的比较internal brace(IB)与带线锚钉通过改良Broström术治疗慢性踝关节不稳的临床疗效。方法回顾性分析2019年5月至2022年2月在桂林市人民医院本院关节骨科行手术治疗的42例慢性踝关节外侧不稳患者资料,根据距腓前韧带修补所用...目的比较internal brace(IB)与带线锚钉通过改良Broström术治疗慢性踝关节不稳的临床疗效。方法回顾性分析2019年5月至2022年2月在桂林市人民医院本院关节骨科行手术治疗的42例慢性踝关节外侧不稳患者资料,根据距腓前韧带修补所用材料的不同将患者分为IB组(19例)和带线锚钉组(23例)。比较两组患者一般资料、手术时间、并发症发生率、术后完全负重行走时间、术后恢复跑步的时间、美国足踝外科协会(American Orthopedic Foot and Ankle Society,AOFAS)踝-后足功能评分、视觉模拟评分法(visual analog scale,VAS)评分。结果所有患者术后均获得随访,随访时间12~18个月,平均(13.8±5.3)个月。两组患者基线资料差异无统计学意义(P>0.05);两组各有1例术口拆线后再出现渗液,换药后愈合;两组各有2例术口区域感觉障碍,除IB组有1例术后半年仍未完全恢复外,其余3例术后2~3个月恢复;IB组患者术后6周随访时AOFAS评分优于带线锚钉组,差异有统计学意义(t=2.239,P=0.025),但术后6周时VAS评分比较差异无统计学意义(t=0.308,P=0.760);末次随访时AOFAS评分和VAS评分比较,两组之间差异无统计学意义(t=0.045,P=0.965;t=0.203,P=0.840);IB组术后完全负重行走时间、术后恢复跑步的时间显著早于带线锚钉组,差异有统计学意义(t=26.566,P<0.01;t=4.838,P<0.01)。结论IB与带线锚钉通过改良Broström术开放治疗慢性踝关节不稳的临床疗效满意,且使用IB在早期康复和重返运动方面优于带线锚钉。展开更多
基金gratefully the China Scholarship Council for providing a PhD Scholarship(CSC No.201906690049).
文摘The Fort d’Issy-Vanves-Clamart(FIVC)braced excavation in France is analyzed to provide insights into the geotechnical serviceability assessment of excavations at great depth within deterministic and probabilistic frameworks.The FIVC excavation is excavated at 32 m below the ground surface in Parisian sedimentary basin and a plane-strain finite element analysis is implemented to examine the wall deflections and ground surface settlements.A stochastic finite element method based on the polynomial chaos Kriging metamodel(MSFEM)is then proposed for the probabilistic analyses.Comparisons with field measurements and former studies are carried out.Several academic cases are then conducted to investigate the great-depth excavation stability regarding the maximum horizontal wall deflection and maximum ground surface settlement.The results indicate that the proposed MSFEM is effective for probabilistic analyses and can provide useful insights for the excavation design and construction.A sensitivity analysis for seven considered random parameters is then implemented.The soil friction angle at the excavation bottom layer is the most significant one for design.The soil-wall interaction effects on the excavation stability are also given.
文摘目的比较internal brace(IB)与带线锚钉通过改良Broström术治疗慢性踝关节不稳的临床疗效。方法回顾性分析2019年5月至2022年2月在桂林市人民医院本院关节骨科行手术治疗的42例慢性踝关节外侧不稳患者资料,根据距腓前韧带修补所用材料的不同将患者分为IB组(19例)和带线锚钉组(23例)。比较两组患者一般资料、手术时间、并发症发生率、术后完全负重行走时间、术后恢复跑步的时间、美国足踝外科协会(American Orthopedic Foot and Ankle Society,AOFAS)踝-后足功能评分、视觉模拟评分法(visual analog scale,VAS)评分。结果所有患者术后均获得随访,随访时间12~18个月,平均(13.8±5.3)个月。两组患者基线资料差异无统计学意义(P>0.05);两组各有1例术口拆线后再出现渗液,换药后愈合;两组各有2例术口区域感觉障碍,除IB组有1例术后半年仍未完全恢复外,其余3例术后2~3个月恢复;IB组患者术后6周随访时AOFAS评分优于带线锚钉组,差异有统计学意义(t=2.239,P=0.025),但术后6周时VAS评分比较差异无统计学意义(t=0.308,P=0.760);末次随访时AOFAS评分和VAS评分比较,两组之间差异无统计学意义(t=0.045,P=0.965;t=0.203,P=0.840);IB组术后完全负重行走时间、术后恢复跑步的时间显著早于带线锚钉组,差异有统计学意义(t=26.566,P<0.01;t=4.838,P<0.01)。结论IB与带线锚钉通过改良Broström术开放治疗慢性踝关节不稳的临床疗效满意,且使用IB在早期康复和重返运动方面优于带线锚钉。
