考虑摩擦系数的砂土中竖向锚定板承载机理离散元分析

王昊; 孙玉海; 江建宏; 刘明朋; 张宏博

doi:10.11779/CJGE2021S2028

考虑摩擦系数的砂土中竖向锚定板承载机理离散元分析 English Version

1.
山东大学齐鲁交通学院,山东　济南　250061
2.
山东省交通规划设计院集团有限公司,山东　济南　250002

详细信息

作者简介:
王昊(1999— ),男,硕士研究生,主要从事支挡结构相关研究。E-mail: 2579348445@qq.com

通讯作者:
张宏博, E-mail: zhanghongbo@sdu.edu.cn

中图分类号: TU43
计量
- 文章访问数: 228
- HTML全文浏览量: 24
- PDF下载量: 92
出版历程
- 收稿日期: 2021-08-24
- 网络出版日期: 2022-12-05
- 刊出日期: 2021-10-31

Mechanism of bearing capacity of vertical anchor plates in sand considering interface friction based on DEM method

1.
School of Qilu Transportation, Shandong University, Jinan 250061, China
2.
Shandong Provincial Communications Planning and Design Institute, Jinan 250002, China

摘要

摘要: 为明确锚定板拉拔造成的土体内部剪切带的形成机制与演化机理,基于离散元方法,采用FLAC-PFC^2D耦合计算程序建立了相应的颗粒流数值模型。研究了锚定板埋深、锚定板-砂土界面摩擦系数对锚定板受拉过程中的抗拔力-位移曲线、板周土体位移场的影响,分析了拉拔过程中的力链变化。结果表明：随着锚定板的埋深增大,锚板在土体中的极限抗拔力随之增大,且土体破坏模式在埋深比为8左右时由整体剪切破坏逐渐转化为局部破坏。通过对锚定板被动区、模型整体的力链分析,进一步明确了竖向条形锚定板受拉过程中的锚定板存在对周围土体承受水平荷载的调动作用细观机理。
- 竖向锚定板 /
- 承载力 /
- 破坏机理 /
- 颗粒流 /
- 界面摩擦
Abstract: In order to clarify the mechanism of formation and evolution of the shear zone of soils near the anchor plate, based on the discrete element method, a particle flow code model by coupling FLAC-PFC2D is established. The effects of embedment depth of the anchor plate and friction coefficient of anchor plate-sand soil interface on the pullout force- displacement curve, soil displacement around the plate and the trend of force chain development in the model during the process of pullout are investigated. The results show that the ultimate pullout force of the anchor plate increases as the embedment ratio of the anchor plate in the soils increases, and the failure mode of the soils gradually changes from the general failure mode to the local one when the embedment depth ratio is about 8. Through the force chain analysis of the whole model and passive zone, the mobilization effects of the anchor plate during pullout process of the vertical strip anchor on the surrounding soils subjected are further clarified.
- vertical anchor plate /
- bearing capacity /
- failure mechanism /
- particle flow code /
- interface frition

HTML全文

图 1 锚板拉拔模型的建立步骤

Figure 1. Proceduce of establishing pullout model

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图 2 锚定板的拉拔位移-承载力曲线

Figure 2. Pullout force-displacement curves of anchor plate

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图 3 板周土体位移云图（ $μ' = 0.5$ ）

Figure 3. Displacement contours around anchor ( $μ' = 0.5$ )

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图 4 H/h=8时的位移云图与矢量图（ $μ' =1$ ）

Figure 4. Displacement contours and vector distribution under embedment ratio H/h = 8 ( $μ' =1$ )

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图 5 拉拔过程中的模型力链图

Figure 5. Force chains of pullout procedure

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表 1 直剪试验模型的细观接触参数

Table 1 Contact parameters of direct shear tests

颗粒性质/接触类型	$k_{n}$	$k_{s}$	$μ$	$cb_tenf$	$cb_shearf$
wall	3.0×10⁷	3.0×10⁸	0	—	—
ball	2.5×10⁷	1.0×10⁸	0.95	—	—
ball-ball	1.6×10⁷	5.0×10⁶	0.95	3.0×10⁵	1.0×10⁵

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表 2 各工况下的极限承载力与破坏模式

Table 2 Peak resistances and failure modes

摩擦系数 $μ'$	埋深比（H/h）	极限承载力/N	破坏模式
0.5	2	2169.9	整体剪切
	4	3249.5	整体剪切
	6	5721.6	整体剪切
	8	7181.3	局部破坏
1	2	2276.9	整体剪切
	4	3633.2	整体剪切
	6	5763.8	整体剪切
	8	8025.9	过渡模式

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