The degradation of the shear stress between pile-clay interface caused by undrained cyclic jacking affects the jacking force.A series of large displacement monotonic shear,cyclic shear and post-cyclic monotonic steel ...The degradation of the shear stress between pile-clay interface caused by undrained cyclic jacking affects the jacking force.A series of large displacement monotonic shear,cyclic shear and post-cyclic monotonic steel plate-clay interface shear te sts were performed under the constant normal load(CNL)condition to inve stigate the effects of normal stre ss,cyclic amplitude,and number of cycles on a steel plate-clay interface using the GDS multi-function interface shear tester.Based on the experimental results,in monotonic shear tests,change of shear stress took place in the specimen,the shear stress rapidly reached the peak value at shear displacement of 1 mm,and then abruptly decreased to the residual value.In cyclic shear te sts,accumulated displacement was a better parameter to describe the soil degradation characteristics,and the degradation degree of shear stress became greater with the increasing of normal stress and accumulated displacement.Shear stress in post-cyclic monotonic shear tests did not generate a peak value and was lower than that in monotonic shear tests under the same normal stress.The soil was completely disturbed and reached the residual strength when the cumulative displacement approached 6 m.An empirical equation to evaluate shear stress degradation mechanism was formulated and the procedure of parameter identification was presented.展开更多
The bearing behavior of suction caissons supporting offshore wind turbines under two-way cyclic lateral loading and dead load in clay was investigated with consideration of soil strength degradation and adhesive inter...The bearing behavior of suction caissons supporting offshore wind turbines under two-way cyclic lateral loading and dead load in clay was investigated with consideration of soil strength degradation and adhesive interface friction between caisson walls and heterogeneous clay using the finite-element package ABAQUS.An ABAQUS built-in user subroutine was programmed to calculate the adhesive interface friction between clay and caisson walls.The results of parametric studies showed that the degradation of bearing capacity could be aggravated by the decrease of the aspect ratio.The offset between the rotation point of the soil inside the caisson and the central axis of the caisson increased with the increasing vertical load and number of cycles.The linearly increasing strength profile and adhesive interface led to the formation of an inverted spoon failure zone inside the caisson.The settlement-rotation curves in each cycle moved downwards with increasing number of cycles due to the soil strength degradation.展开更多
目的:基于网络药理学技术研究牛膝-钩藤药对治疗糖尿病合并高血压的作用机制。方法:基于中药系统药理学数据库与分析平台(traditional Chinese medicine systems pharmacology database and analysis platform,TCMSP)检索牛膝、钩藤的...目的:基于网络药理学技术研究牛膝-钩藤药对治疗糖尿病合并高血压的作用机制。方法:基于中药系统药理学数据库与分析平台(traditional Chinese medicine systems pharmacology database and analysis platform,TCMSP)检索牛膝、钩藤的活性成分及相关作用靶点,利用Cytoscape 3.7.2软件构建“药物-活性成分-靶点”相互作用网络图;在人类孟德尔遗传数据库(online mendelian inheritance in man,OMIM)、人类基因数据库(GeneCards)、DrugBank数据库及疗效药靶数据库(therapeutic target database,TTD)中筛选糖尿病、高血压的相关靶点,与活性成分靶点进行映射,并绘制“活性成分-疾病”交集靶点韦恩图。利用STRING在线分析平台分析交集靶点的相互作用关系,利用CentiScaPe 2.2插件进行网络拓扑分析,筛选出牛膝-钩藤治疗糖尿病合并高血压的潜在核心靶点。采用基因注释和资源分析数据库(Metascape)对潜在核心靶点进行基因本体(gene ontology,GO)功能富集分析和京都基因与基因组百科全书(kyoto encyclopedia of genes and genomes,KEGG)通路富集分析,并利用Cytoscape 3.7.2软件构建“活性成分-核心靶点-通路-疾病”网络图。结果:共筛选出牛膝-钩藤活性成分46个及其作用靶点199个,糖尿病合并高血压相关靶点1 494个,将活性成分靶点与疾病靶点取交集,得到104个交集靶点。网络拓扑分析筛选出潜在核心靶点47个。GO富集分析得到生物过程1 004条、分子功能32条及细胞组成84条。KEGG通路富集分析得出153条信号通路。结论:牛膝-钩藤药对通过多成分、多靶点、多途径干预并治疗糖尿病合并高血压。展开更多
基金financially supported by the Fundamental Research Funds for the Study on Formation and Evolution Mechanism of Soil Plug of Jacked Pipe Pile Cyclic Penetration in Clay (Grant No.52078483)。
文摘The degradation of the shear stress between pile-clay interface caused by undrained cyclic jacking affects the jacking force.A series of large displacement monotonic shear,cyclic shear and post-cyclic monotonic steel plate-clay interface shear te sts were performed under the constant normal load(CNL)condition to inve stigate the effects of normal stre ss,cyclic amplitude,and number of cycles on a steel plate-clay interface using the GDS multi-function interface shear tester.Based on the experimental results,in monotonic shear tests,change of shear stress took place in the specimen,the shear stress rapidly reached the peak value at shear displacement of 1 mm,and then abruptly decreased to the residual value.In cyclic shear te sts,accumulated displacement was a better parameter to describe the soil degradation characteristics,and the degradation degree of shear stress became greater with the increasing of normal stress and accumulated displacement.Shear stress in post-cyclic monotonic shear tests did not generate a peak value and was lower than that in monotonic shear tests under the same normal stress.The soil was completely disturbed and reached the residual strength when the cumulative displacement approached 6 m.An empirical equation to evaluate shear stress degradation mechanism was formulated and the procedure of parameter identification was presented.
基金supported by the National Natural Science Foundation of China(Grant No.52078483).
文摘The bearing behavior of suction caissons supporting offshore wind turbines under two-way cyclic lateral loading and dead load in clay was investigated with consideration of soil strength degradation and adhesive interface friction between caisson walls and heterogeneous clay using the finite-element package ABAQUS.An ABAQUS built-in user subroutine was programmed to calculate the adhesive interface friction between clay and caisson walls.The results of parametric studies showed that the degradation of bearing capacity could be aggravated by the decrease of the aspect ratio.The offset between the rotation point of the soil inside the caisson and the central axis of the caisson increased with the increasing vertical load and number of cycles.The linearly increasing strength profile and adhesive interface led to the formation of an inverted spoon failure zone inside the caisson.The settlement-rotation curves in each cycle moved downwards with increasing number of cycles due to the soil strength degradation.
文摘目的:基于网络药理学技术研究牛膝-钩藤药对治疗糖尿病合并高血压的作用机制。方法:基于中药系统药理学数据库与分析平台(traditional Chinese medicine systems pharmacology database and analysis platform,TCMSP)检索牛膝、钩藤的活性成分及相关作用靶点,利用Cytoscape 3.7.2软件构建“药物-活性成分-靶点”相互作用网络图;在人类孟德尔遗传数据库(online mendelian inheritance in man,OMIM)、人类基因数据库(GeneCards)、DrugBank数据库及疗效药靶数据库(therapeutic target database,TTD)中筛选糖尿病、高血压的相关靶点,与活性成分靶点进行映射,并绘制“活性成分-疾病”交集靶点韦恩图。利用STRING在线分析平台分析交集靶点的相互作用关系,利用CentiScaPe 2.2插件进行网络拓扑分析,筛选出牛膝-钩藤治疗糖尿病合并高血压的潜在核心靶点。采用基因注释和资源分析数据库(Metascape)对潜在核心靶点进行基因本体(gene ontology,GO)功能富集分析和京都基因与基因组百科全书(kyoto encyclopedia of genes and genomes,KEGG)通路富集分析,并利用Cytoscape 3.7.2软件构建“活性成分-核心靶点-通路-疾病”网络图。结果:共筛选出牛膝-钩藤活性成分46个及其作用靶点199个,糖尿病合并高血压相关靶点1 494个,将活性成分靶点与疾病靶点取交集,得到104个交集靶点。网络拓扑分析筛选出潜在核心靶点47个。GO富集分析得到生物过程1 004条、分子功能32条及细胞组成84条。KEGG通路富集分析得出153条信号通路。结论:牛膝-钩藤药对通过多成分、多靶点、多途径干预并治疗糖尿病合并高血压。
