串联式双锚定板临界埋深及临界间距研究

Study on Critical Depth and Critical Spacing of Double Anchor Plates in Series

摘要: 在对常规锚定板抗拔能力对比分析之后，提出了串联锚定板抗拔结构。通过模型试验，比较了常规单锚板和串联双锚板抗拔结构的抗拔性能。基于FLAC三维有限差分软件的传统单、串联双锚定板抗拔结构与土壤相互作用的数值模型，同时，以方形串联式双锚定板结构为例，探讨了串联式双锚定板结构的埋深及上下锚定板间距对抗拔承载力的影响。研究结果表明：1) 传统单锚定板结构的抗拔承载力远低于串联式双锚定板结构。2) 在上下锚定板间距恒定时，当下锚定板埋深比H/D (H为下锚定板埋深，D为方形锚定板边长)小于某一埋深比，双锚定板结构的抗拔力系数随埋深比的增大而增大。当下锚定板埋深比H/D大于某一埋深比，双锚定板结构抗拔力系数随埋深比的增大反而降低，其临界埋深比H/D在9~11之间。3) 在下锚定板埋深恒定时，当上下锚定板间距比S/D (S为上下锚定板间距)小于某一间距比，双锚定板抗拔力系数随间距比的增大而增大。当上下锚定板间距比S/D大于某一间距比，双锚定板抗拔力系数随间距比的增大反而降低，其上下锚定板临界间距比S/D在4~5之间，同时，锚定板周围土体破坏模式从“圆柱形破坏模式”转变为“局部独立破坏模式”。

Abstract: After the comparative analysis of the pullout resistance of the conventional anchoring plate, a series anchoring plate is proposed. The bearing characteristics of traditional single anchored plate and double anchored plate in series were studied by model test. FLAC 3D software differences, a numerical model was established for the interaction between the anchored plate anti-pull structure and soil. At the same time, taking the square double-anchored plate structure as an example, the influence of the buried depth of the double-anchored plate structure and the space between the upper and lower anchored plates on the anti-pull capacity was discussed. Results: 1) The pull load of the conventional single anchor plate structure is much lower than that of the series double anchor plate structure. 2) When the spacing between the upper and lower anchored plates is constant, the buried depth ratio of the current anchored plate H/D (H is the buried depth of the anchored plate and D is the side length of the square anchored plate) is less than a certain buried depth ratio, and the pulling force coefficient of the structure of the twin anchored plate increases with the increase of the buried depth ratio. When the buried depth ratio of the current anchored-plate is greater than a certain buried depth ratio, the tensile strength coefficient of the double-anchored-plate structure decreases with the increase of the buried depth ratio, and its critical buried depth ratio H/D is between 9~11. 3) Anka plate in Desmond, lowering standards down through many anka plate between interval ratio S/D (S is upper and lower anka plate spacing between the ratio) than a certain distance from the childhood compared, two an choring plate the withdrawal and coefficients increase with the growth of interval proportional. When the spacing ratio S/D of the upper and lower anchoring plates is larger than a certain spacing ratio, the pullout coefficient of the two anchoring plates decreases with the increase of the spacing ratio, and the critical spacing ratio S/D of the upper and lower anchoring plates is between 4~5. Meanwhile, the soil failure mode around the anchoring plates changes from “cylinder failure mode” to “independent failure mode”.