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Stability analysis of gravity anchor foundation of layered argillaceous sandstone under dry-wet cycles

Journal of Mountain Science 2023年第4期20卷 1118-1130页

作者： ZHENG Jing-cheng CHEN Wei ZHENG Ke-ren GU Yu-peng WANG Fei HUANG Zhen LI Yun School of Civil Engineering Central South UniversityChangsha410075China The 8th Engineering Co. LTDChina Railway Major Bridge Engineering Group Co.LTD.Chongqing400026China Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang110819China College of Civil Engineering and Architecture Key Laboratory of Disaster Prevention and Structural SafetyGuangxi UniversityNanning530004China

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 *** 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 ***,numerical simulation was used to restore in-situ shear tests and a good agreement was *** 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 *** results demonstrated that the dry-wet cycles caused uneven settlement of the anchor foundation,resulting in more serious stress concentration in 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 *** there was weak interlayer in the rock layer,the anti-sliding stability of the anchor foundation was affected drastically.

关键词： gravity anchor foundation Stability In-situ tests Dry-wet cycles Numerical simulation

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