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Stability analysis of gravity anchor foundation of layered argillaceous sandstone under dry-wet cycles 被引量:1
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作者 ZHENG Jing-cheng CHEN Wei +4 位作者 ZHENG Ke-ren GU Yu-peng WANG Fei HUANG Zhen LI Yun 《Journal of Mountain Science》 SCIE CSCD 2023年第4期1118-1130,共13页
To investigate the stability of gravity anchors of suspension bridges,in-situ tests of the vertical bearing capacity of the bedrock,shear resistance of the anchor-rock interface,shear resistance of the bedrock were co... To investigate the stability of gravity anchors of suspension bridges,in-situ tests of the vertical bearing capacity of the bedrock,shear resistance of the anchor-rock interface,shear resistance of the bedrock were conducted in a suspension bridge project.Under dry-wet cycles,the deterioration law of the mechanical properties of argillaceous sandstone was identified in laboratory tests:the elastic modulus,cohesion and friction of the argillaceous sandstone deteriorated significantly at first few dry-wet cycles and then declined slowly after 10 cycles,ultimately these three mechanical parameters were reduced to about 1/3,1/3,2/3 of the initial value respectively.Moreover,numerical simulation was used to restore in-situ shear tests and a good agreement was obtained.Base on the results of in-situ and laboratory tests,the stability of the gravity anchor foundation under natural conditions and drywet cycles was calculated and its failure modes were analyzed.The results demonstrated that the dry-wet cycles caused uneven settlement of the anchor foundation,resulting in more serious stress concentration in the substrate.The dry-wet cycles remarkably reduced the stability coefficient of the anchor foundation,whose failure mode shifted from overturning failure under natural conditions to sliding failure.When there was weak interlayer in the rock layer,the anti-sliding stability of the anchor foundation was affected drastically. 展开更多
关键词 Gravity anchor foundation STABILITY In-situ tests dry-wet cycles Numerical simulation
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Law of Water Content Change in Subgrade Soil Under Action of Dry-Wet Cycle 被引量:1
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作者 ZHANG Qingsong JI Tianjian XIAO Lei 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2021年第S01期69-75,共7页
Due to the influence of the groundwater level,the internal humidity of the subgrade changes and the stability of the subgrade is affected. The main purpose of this paper is to obtain a reliable model of subgrade soil ... Due to the influence of the groundwater level,the internal humidity of the subgrade changes and the stability of the subgrade is affected. The main purpose of this paper is to obtain a reliable model of subgrade soil water content variation under the action of dry-wet cycle through sensor readings. Thus,an indoor soil column model test system is designed,and the readings of the sensors are used to determine the changing law of moisture field in the subgrade soil. The sensor readings indicate that the water content gradually decreases along the height of the soil column,and the water in the upper part of the soil column continuously loses,while the water in the lower part migrates upward to supplement. With the increase of dry-wet cycle index,the water holding capacity of soil decreases,and the soil surface gradually cracks and tends to rupture. 展开更多
关键词 subgrade soil dry-wet cycle water content change soil column indoor test
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冻融循环下混凝土中氯离子的扩散性 被引量:20
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作者 何世钦 贡金鑫 赵国藩 《水利水运工程学报》 CSCD 北大核心 2004年第4期32-36,共5页
经冻融循环的混凝土试件在3.5%Nacl溶液中浸泡试验结果表明,冻融循环使混凝土中氯离子的含量 增加,扩散系数增大,氯离子扩散系数并不是常量,且随时间变化.
关键词 冻融循环 混凝土试件 氯离子扩散系数 扩散性 浸泡试验
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混凝土中钢筋腐蚀的氯离子临界浓度试验研究 被引量:14
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作者 李岩 朱雅仙 方璟 《水利水运工程学报》 CSCD 北大核心 2004年第1期24-28,共5页
用半电池电位法、交流阻抗法、时间电位法判断9种技术条件的混凝土试件中钢筋表面腐蚀状态.测得试件全浸泡情况下钢筋腐蚀时的氯离子浓度大于干湿循环条件下的氯离子浓度.混凝土水胶比对氯离子临界浓度的影响较显著.混凝土中掺入粉煤灰... 用半电池电位法、交流阻抗法、时间电位法判断9种技术条件的混凝土试件中钢筋表面腐蚀状态.测得试件全浸泡情况下钢筋腐蚀时的氯离子浓度大于干湿循环条件下的氯离子浓度.混凝土水胶比对氯离子临界浓度的影响较显著.混凝土中掺入粉煤灰或矿渣粉对氯离子临界浓度基本无影响. 展开更多
关键词 混凝土 钢筋 腐蚀 氯离子 临界浓度 干湿循环 混凝土试件 室内试验
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强盐沼泽区干湿循环作用下桥梁桩基腐蚀损伤
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作者 冯忠居 陈慧芸 +3 位作者 王富春 胡海波 徐占慧 姚贤华 《交通运输工程学报》 EI CSCD 北大核心 2023年第6期156-167,共12页
为探明干湿循环与强盐沼泽腐蚀作用下桥梁桩基混凝土材料损伤机理,通过室内模拟试验,研究了不同材料质量比的混凝土浸入不同浓度复合盐溶液,经干湿循环后的质量损失率、相对动弹性模量和抗侵蚀系数;基于扫描电子显微镜(SEM)、能谱仪(EDS... 为探明干湿循环与强盐沼泽腐蚀作用下桥梁桩基混凝土材料损伤机理,通过室内模拟试验,研究了不同材料质量比的混凝土浸入不同浓度复合盐溶液,经干湿循环后的质量损失率、相对动弹性模量和抗侵蚀系数;基于扫描电子显微镜(SEM)、能谱仪(EDS)和化学成分分析相结合的方法,研究了桩身混凝土抗腐蚀微观机理。研究结果表明:经干湿循环后混凝土质量增长是因为在材料内部生成了钙矾石、Friedel盐等膨胀性晶体,氯盐的存在能够抑制硫酸盐对于桩基混凝土的侵蚀作用;复合盐溶液浓度不同时,经过120次的干湿循环后,水泥、碎石、砂子、水、粉煤灰、减水剂、硅灰、膨胀剂质量比为327∶1103∶767∶170∶87∶7∶22∶44(质量比Ⅲ)的桩基混凝土试件的相对动弹性模量为92.7%,抗侵蚀系数最小为0.91,而在未添加硅灰和膨胀剂的质量比与仅添加硅灰的质量比下桩基混凝土试件的相对动弹性模量最大为89.7%,抗侵蚀系数最小为0.80,质量比Ⅲ的桩基混凝土试件的抗侵蚀性能较好,桩基混凝土试件受到膨胀力但内部未产生裂缝,说明添加硅灰和膨胀剂提升了桩基混凝土的抗侵蚀能力且可以确保桩基混凝土不产生裂缝。可见,实际工程中可综合考虑区域内腐蚀性离子类别等因素,在质量比Ⅲ的基础上进一步优化桩基混凝土的质量比。 展开更多
关键词 桥梁工程 强盐沼泽区 桩基腐蚀损伤机理 室内干湿循环试验 抗侵蚀系数
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