Monocolumn composite bucket foundation is a new type of offshore wind energy foundation.Its bearing characteristics under shallow bedrock conditions and complex geological conditions have not been extensively studied....Monocolumn composite bucket foundation is a new type of offshore wind energy foundation.Its bearing characteristics under shallow bedrock conditions and complex geological conditions have not been extensively studied.Therefore,to analyze its bearing characteristics under complex conditions-such as silty soil,chalky soil,and shallow bedrock-this paper employs finite element software to establish various soil combination scenarios.The load-displacement curves of the foundations under these scenarios are calculated to subsequently evaluate the horizontal ultimate bearing capacity.This study investigates the effects of shallow bedrock depth,the type of soil above the bedrock,the thickness of layered soil,and the quality of layered soil on the bearing characteristics of the monocolumn composite bucket foundation.Based on the principle of single-variable control,the ultimate bearing capacity characteristics of the foundation under different conditions are compared.The distribution of soil pressure inside and outside the bucket wall on the compressed side of the foundation,along with the plastic strain of the soil at the base of the foundation,is also analyzed.In conclusion,shallow bedrock somewhat reduces foundation bearing capacity.Under shallow bedrock conditions,the degree of influence on foundation bearing capacity characteristics can considerably vary on different upper soils.The thickness of each soil layer and the depth to bedrock in stratified soils also affect the bearing capacity of the foundation.The findings of this paper provide a theoretical reference for related foundation design and construction.In practice,the bearing performance of the foundation can be enhanced by improvingthe soil quality in the bucket,adjusting the penetration depth,adjusting the percentage of different types of soil layers in the bucket,and applying other technical construction methods.展开更多
为应对复杂环境下地铁车站施工过程中日益突出的安全风险问题,构建科学的风险评价体系,文中采用G1-CRITIC组合赋权法,融合专家主观判断与客观数据分析,确定风险指标权重,并借助逼近理想解排序法(Technique for Order Preference by Simi...为应对复杂环境下地铁车站施工过程中日益突出的安全风险问题,构建科学的风险评价体系,文中采用G1-CRITIC组合赋权法,融合专家主观判断与客观数据分析,确定风险指标权重,并借助逼近理想解排序法(Technique for Order Preference by Similarity to an Ideal Solution,TOPSIS)对各风险因素进行排序,构建综合安全风险评价模型。以武汉地铁7号线北华街车站为例,通过对人员、设备、材料、技术与环境五类因素的风险分析,模型成功识别出设备操作正确性和施工人员安全意识等关键高风险点。结果验证该模型在识别、排序施工风险方面具备良好科学性与实用性,并为地铁施工安全管理提供了有效的理论支持和决策依据,具有推广应用价值。展开更多
文摘Monocolumn composite bucket foundation is a new type of offshore wind energy foundation.Its bearing characteristics under shallow bedrock conditions and complex geological conditions have not been extensively studied.Therefore,to analyze its bearing characteristics under complex conditions-such as silty soil,chalky soil,and shallow bedrock-this paper employs finite element software to establish various soil combination scenarios.The load-displacement curves of the foundations under these scenarios are calculated to subsequently evaluate the horizontal ultimate bearing capacity.This study investigates the effects of shallow bedrock depth,the type of soil above the bedrock,the thickness of layered soil,and the quality of layered soil on the bearing characteristics of the monocolumn composite bucket foundation.Based on the principle of single-variable control,the ultimate bearing capacity characteristics of the foundation under different conditions are compared.The distribution of soil pressure inside and outside the bucket wall on the compressed side of the foundation,along with the plastic strain of the soil at the base of the foundation,is also analyzed.In conclusion,shallow bedrock somewhat reduces foundation bearing capacity.Under shallow bedrock conditions,the degree of influence on foundation bearing capacity characteristics can considerably vary on different upper soils.The thickness of each soil layer and the depth to bedrock in stratified soils also affect the bearing capacity of the foundation.The findings of this paper provide a theoretical reference for related foundation design and construction.In practice,the bearing performance of the foundation can be enhanced by improvingthe soil quality in the bucket,adjusting the penetration depth,adjusting the percentage of different types of soil layers in the bucket,and applying other technical construction methods.
文摘为应对复杂环境下地铁车站施工过程中日益突出的安全风险问题,构建科学的风险评价体系,文中采用G1-CRITIC组合赋权法,融合专家主观判断与客观数据分析,确定风险指标权重,并借助逼近理想解排序法(Technique for Order Preference by Similarity to an Ideal Solution,TOPSIS)对各风险因素进行排序,构建综合安全风险评价模型。以武汉地铁7号线北华街车站为例,通过对人员、设备、材料、技术与环境五类因素的风险分析,模型成功识别出设备操作正确性和施工人员安全意识等关键高风险点。结果验证该模型在识别、排序施工风险方面具备良好科学性与实用性,并为地铁施工安全管理提供了有效的理论支持和决策依据,具有推广应用价值。
