In this study,the influence of soil properties on the failure behavior and mechanism of slope under earthquake after rainfall was studied with shaking table test in the laboratory,in which the failure process of slope...In this study,the influence of soil properties on the failure behavior and mechanism of slope under earthquake after rainfall was studied with shaking table test in the laboratory,in which the failure process of slope and instant responses of water content and pore water pressure were tested.Based on the principle of similarity,a model test was designed.The experimental results showed that soil properties exhibit significant influence on failure mode and failure mechanism of slope.Local flowslide,local failure,and creep flowslide failure modes appear in the slope exposed to only rainfall.However,under earthquake after rainfall,the other three failure modes occur,i.e.,local slip failure,overall slip failure,and shallow scouring and creep flowslide failure.The spatial distribution of water content and pore water pressure are the two key factors leading to slope failure.Furthermore,due to the difference of permeability,the soil properties not only affect the spatial distribution of water content of the slope after rainfall,resulting in the peak pore water pressure which occurs mainly near the foot of the slope and near the bedrock interface in the middle and lower parts of the slope,but also affect the dissipation of excess pore water pressure in the process of earthquake.Finally,it is discovered that different types of soil lead to significant differences in the peak acceleration of slope failure.The critical acceleration of slope with coarse-grained soil is greater than that of slope with fine-grained soil.The critical acceleration of slope failure shows a close relationship with soil properties.展开更多
[目的]比较骨搬运与包裹植骨治疗单纯胫骨大段骨缺损的效果。[方法]回顾性分析2009年1月～2016年12月80例皮肤条件相对良好的胫骨骨缺损>5 cm患者。按修复骨缺损方法不同分为骨搬运组(49例)和包裹植骨组(31例)。两组患者在年龄、性...[目的]比较骨搬运与包裹植骨治疗单纯胫骨大段骨缺损的效果。[方法]回顾性分析2009年1月～2016年12月80例皮肤条件相对良好的胫骨骨缺损>5 cm患者。按修复骨缺损方法不同分为骨搬运组(49例)和包裹植骨组(31例)。两组患者在年龄、性别、缺损原因、缺损距离骨修复时间和合并伤方面比较,差异均无统计学意义(P>0.05)。比较两组下地时间、负重时间、骨不连、骨愈合时间、并发症、骨缺损修复手术费用和末次随访患肢邻近关节功能恢复(Johner-Wruhs评价方法)等情况。[结果]骨搬运组与包裹植骨组在卧床时间[(23.36±6.72) d vs(27.26±12.21) d,P>0.05]、负重行走时间[(95.98±15.67) d vs (102.55±17.54) d,P>0.05]的差异无统计学意义。但是,骨搬运组的骨不连发生率显著高于包裹植骨组,差异有统计学意义[(18/49) vs (1/31),P<0.05],对骨不连者行二次手术清创植骨内固定,二次术后均达到骨性愈合。骨搬运组的骨愈合时间显著长于包裹植骨组,差异有统计学意义[(11.10±3.44)个月vs (7.77±1.67)个月,P<0.05]。此外,骨搬运组的治疗费用显著高于包裹植骨组,差异有统计学意义[(7.66±2.05)万元vs (4.46±1.20)万元,P<0.05]。末次随访时,两组患者Johner-Wruhs评定的临床效果差异无统计学意义(P>0.05)。[结论]对于单纯胫骨大段骨缺损,骨搬运和包裹植骨均是有效方法,但包裹植骨在骨愈合效果、治疗费用和并发症方面优于骨搬运。展开更多
基金Sichuan Provincial Science and Technology Plan Project(2021YFS0323,)National Key Research and Development Program(2021YFB2301203)。
文摘In this study,the influence of soil properties on the failure behavior and mechanism of slope under earthquake after rainfall was studied with shaking table test in the laboratory,in which the failure process of slope and instant responses of water content and pore water pressure were tested.Based on the principle of similarity,a model test was designed.The experimental results showed that soil properties exhibit significant influence on failure mode and failure mechanism of slope.Local flowslide,local failure,and creep flowslide failure modes appear in the slope exposed to only rainfall.However,under earthquake after rainfall,the other three failure modes occur,i.e.,local slip failure,overall slip failure,and shallow scouring and creep flowslide failure.The spatial distribution of water content and pore water pressure are the two key factors leading to slope failure.Furthermore,due to the difference of permeability,the soil properties not only affect the spatial distribution of water content of the slope after rainfall,resulting in the peak pore water pressure which occurs mainly near the foot of the slope and near the bedrock interface in the middle and lower parts of the slope,but also affect the dissipation of excess pore water pressure in the process of earthquake.Finally,it is discovered that different types of soil lead to significant differences in the peak acceleration of slope failure.The critical acceleration of slope with coarse-grained soil is greater than that of slope with fine-grained soil.The critical acceleration of slope failure shows a close relationship with soil properties.
文摘[目的]比较骨搬运与包裹植骨治疗单纯胫骨大段骨缺损的效果。[方法]回顾性分析2009年1月～2016年12月80例皮肤条件相对良好的胫骨骨缺损>5 cm患者。按修复骨缺损方法不同分为骨搬运组(49例)和包裹植骨组(31例)。两组患者在年龄、性别、缺损原因、缺损距离骨修复时间和合并伤方面比较,差异均无统计学意义(P>0.05)。比较两组下地时间、负重时间、骨不连、骨愈合时间、并发症、骨缺损修复手术费用和末次随访患肢邻近关节功能恢复(Johner-Wruhs评价方法)等情况。[结果]骨搬运组与包裹植骨组在卧床时间[(23.36±6.72) d vs(27.26±12.21) d,P>0.05]、负重行走时间[(95.98±15.67) d vs (102.55±17.54) d,P>0.05]的差异无统计学意义。但是,骨搬运组的骨不连发生率显著高于包裹植骨组,差异有统计学意义[(18/49) vs (1/31),P<0.05],对骨不连者行二次手术清创植骨内固定,二次术后均达到骨性愈合。骨搬运组的骨愈合时间显著长于包裹植骨组,差异有统计学意义[(11.10±3.44)个月vs (7.77±1.67)个月,P<0.05]。此外,骨搬运组的治疗费用显著高于包裹植骨组,差异有统计学意义[(7.66±2.05)万元vs (4.46±1.20)万元,P<0.05]。末次随访时,两组患者Johner-Wruhs评定的临床效果差异无统计学意义(P>0.05)。[结论]对于单纯胫骨大段骨缺损,骨搬运和包裹植骨均是有效方法,但包裹植骨在骨愈合效果、治疗费用和并发症方面优于骨搬运。
