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考虑钙质砂颗粒破碎的分数阶边界面本构模型 被引量:6
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作者 汪成贵 束善治 +2 位作者 肖杨 路德春 刘汉龙 《岩土工程学报》 EI CAS CSCD 北大核心 2023年第6期1162-1170,共9页
钙质砂作为海洋工程中广泛应用的建筑材料,颗粒破碎会导致其强度和剪胀性降低,压缩性增加,影响构筑物的安全和稳定。通过引入破碎应力建立考虑颗粒破碎的临界状态线来描述破碎对临界状态线位置和形状的影响;并基于分数阶微分和状态相关... 钙质砂作为海洋工程中广泛应用的建筑材料,颗粒破碎会导致其强度和剪胀性降低,压缩性增加,影响构筑物的安全和稳定。通过引入破碎应力建立考虑颗粒破碎的临界状态线来描述破碎对临界状态线位置和形状的影响;并基于分数阶微分和状态相关理论建立了统一的状态相关分数阶塑性流动法则;在边界面塑性理论和临界状态理论框架下建立了考虑钙质砂颗粒破碎和状态相关特性的分数阶塑性边界面本构模型。模型能够模拟不同初始密实度和围压条件下钙质砂三轴排水试验结果和颗粒破碎影响下的状态相关行为,并验证了模型的适用性。 展开更多
关键词 钙质砂 颗粒破碎 状态相关 分数阶 本构模型
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Comparing Design Void Content with Actual Void Content of Laboratory Prepared Pervious Concrete 被引量:1
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作者 Anthony Torres Cristián Gaedicke +2 位作者 Jiong Hu Rupesh Bejugam Sarah McMasters 《Materials Sciences and Applications》 2018年第7期596-613,共18页
The goal of this study was to compare the predicted void content with the actual void content of pervious concrete cylinders. All pervious concrete systems are designed with a void content in mind to facilitate a spec... The goal of this study was to compare the predicted void content with the actual void content of pervious concrete cylinders. All pervious concrete systems are designed with a void content in mind to facilitate a specific permeability;however, due to variable placing techniques and inherent issues with the material, the actual in place void content often varies from designed. This study quantifies this difference and attempts to develop a correction factor, such that design values are more approximate to in place pervious concrete systems. The analysis included multiple mixtures with three design void contents (15%, 25%, 35%), two aggregate types (angular and rounded), and three different water-to-cement ratios (0.33, 0.37, 0.41). These samples were methodically designed to contain a desired void ratio, then casted in the laboratory, in which the compaction of each sample was controlled for consistency. Following casting, the in-place void content was determined using ASTM C1754 and compared to the predicted. The difference was then averaged to create a correction factor requiring more or less cement paste, which was used to redesign the mixtures. The new mixtures were then compared to the predicted void content. The results of this study show that initial designs can vary from 3% - 15% on average from initial designed void content and that a correction factor can be used to obtain within 3% on average of the target void ratios. 展开更多
关键词 Pervious Concrete VOID CONTENT PERMEABILITY COMPACTION
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A constitutive model incorporating particle breakage for gravelly soil-structure interface under cyclic loading 被引量:2
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作者 CUI Hao XIAO Yang +2 位作者 SHU ShanZhi HE Xiang LIU HanLong 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2022年第12期2846-2855,共10页
Under cyclic loading,particle breakage occurs at gravelly soil-structure interface,resulting in the decrease of interface strength and the increase of normal displacement.Based on the theory of critical state soil mec... Under cyclic loading,particle breakage occurs at gravelly soil-structure interface,resulting in the decrease of interface strength and the increase of normal displacement.Based on the theory of critical state soil mechanics,the modified Cam-Clay model(MCC)was extended to the plane strain condition of the interface,the state parameter was introduced and the influence of particle breakage on the critical state line was considered,and the cyclic constitutive model for gravelly soil-structure interface considering particle breakage was established by using the non-associated flow rule.Then,the established cyclic constitutive model was used to simulate large-scale cycle direct shear tests of Zipingpu rockfill-steel interface and Zipingpu rockfill-concrete interface under constant normal load(CNL)and constant normal stiffness(CNS),respectively.The simulation results show that under the CNL cyclic loading path,there is little difference between the cyclic shear stress considering particle breakage and that without particle breakage,but the normal displacement considering particle breakage is larger than that without particle breakage,and the difference increases with the increasing number of cycles and normal stress;Under the CNS cyclic loading path,with the increase of the number of cycles,the cyclic shear stress and cyclic normal stress considering particle breakage is significantly smaller than that without particle breakage,and the shear contraction of normal displacement becomes more obvious.In general,the simulation results are closer to the experimental results when particle breakage is considered. 展开更多
关键词 gravelly soil-structure INTERFACE particle breakage cyclic loading constitutive model
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