防水卷材上置悬臂式挡墙的剪切滑移试验研究

卜崇鹏; 樊宇超; 王勇华; 杨丽娜; 罗丽娟; 张小辉; 王明皎

doi:10.20265/j.cnki.issn.1007-2993.2024-0232

防水卷材上置悬臂式挡墙的剪切滑移试验研究

doi: 10.20265/j.cnki.issn.1007-2993.2024-0232

1.
机械工业勘察设计研究院有限公司，陕西西安　710043
2.
长安大学建筑工程学院，陕西西安　710061

详细信息

作者简介:
卜崇鹏，男，1984年生，硕士，主要从事岩土工程设计等方面的工作。E-mail：564100069@qq.com

通讯作者:
樊宇超，男，1997年生，硕士，主要从事岩土工程设计等方面的工作。E-mail：1473013122@qq.com

中图分类号: TU476
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出版历程
- 收稿日期: 2024-05-28
- 修回日期: 2024-07-04
- 录用日期: 2024-08-29
- 刊出日期: 2025-10-10

Shear-slip test study of cantilever retaining wall structure on waterproof layer

1.
China Jikan Research Institute of Engineering Investigations and Design Co., Ltd., Xi’an 710043, Shaanxi, China
2.
School of Civil Engineering, Chang’an University, Xi’an 710064, Shaanxi, China

摘要

摘要: 通过设置多组室内大型剪切试验、蠕变与应力松弛耦合试验，研究悬臂式挡墙置于三种防水做法保护层上的抗滑承载力、剪切滑移破坏特征及机理。试验结果表明：在剪切变形过程中，悬臂式挡墙结构底板与防水层接触处出现明显变形与破坏，其主要破坏形式为滑移破坏与剥离破坏；悬臂式挡墙结构的剪切变形破坏过程包含变形、滑移和剥离三个阶段；不同做法的防水层对上置挡土墙水平位移、抗滑承载力的影响存在明显差异；防水层上置挡土墙的基底摩擦系数主要介于0.1～0.2，与常规岩土地基挡土墙相比，挡墙的基底摩擦系数明显较小，相同荷载作用下水平位移较大。
- 挡土墙 /
- 防水层 /
- 抗滑承载力 /
- 破坏机理 /
- 蠕变
Abstract: The anti-sliding bearing capacity, shear-slip failure characteristics, and mechanism of cantilever retaining walls placed on the protective layer of three waterproofing practices were studied through indoor large-scale shear tests and creep-stress relaxation coupled tests. Experimental results revealed that shear deformation, obvious deformation, and failure occur at the contact between the base plate of the cantilever retaining wall structure and the waterproof layer, and two forms mainly occur: slip failure and peeling failure. The shear deformation failure process of the cantilever retaining wall structure includes three stages: deformation, slippage, and peeling. The influence of different waterproof layers on the horizontal displacement and anti-slip bearing capacity of the upper retaining wall is obvious. The basement friction coefficient of the retaining wall on the waterproof layer is between 0.1 and 0.2, and compared with the conventional rock foundation retaining wall, the basement friction coefficient of the retaining wall is significantly smaller, and the horizontal displacement is large.
- retaining walls /
- waterproof layer /
- anti-slip bearing capacity /
- mechanism of destruction /
- creep

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图 1 1L-1M支护段剖面图（单位：mm）

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图 2 模型加载装置

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图 3 模型试验简化示意

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图 4 防水层处应力–应变关系

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图 5 蠕变与应力松弛耦合试验结果

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图 6 防水层破坏图

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图 7 防水层上置挡土墙剪切变形破坏示意图

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表 1 模型试验中试件基本参数

工程实例	试件名称	长度 /cm	宽度 /cm	厚度 /cm	混凝土强度等级
1-A型悬臂式挡土墙	加载板	70	50	10	C30
地库顶板	地库板	80	50	15	C30

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表 2 地库板防水层的三种常见做法

层数	双层卷材	防水涂料	单层卷材
实物图
1	70 mm厚C20细石混凝土保护层	70 mm厚C20细石混凝土保护层	70 mm厚C20细石混凝土保护层
2	干铺石油沥青纸胎油毡一层	干铺石油沥青纸胎油毡一层	干铺石油沥青纸胎油毡一层
3	4 mm厚SBS改性沥青耐根刺穿防水卷材	4 mm厚SBS改性沥青耐根刺穿防水卷材	4 mm厚SBS改性沥青耐根刺穿防水卷材
4	4 mm厚SBS改性沥青耐根刺穿防水卷材	3 mm厚自黏聚合物改性沥青防水卷材(聚酯胎)	1.5 mm厚自黏聚合物改性沥青防水卷材(无胎)
5	3mm厚SBS改性沥青防水卷材	20 mm厚1:3水泥砂浆找平层	3 mm厚SBS改性沥青防水卷材
6	表面抹平钢筋混凝土板	1.5 mm厚聚氨酯防水涂料	表面抹平钢筋混凝土板
7		表面抹平钢筋混凝土板

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表 3 挡土墙结构设计等效荷载

工况	挡墙高度H/m	挡墙基底压力/kPa	竖向集中荷载G/kN
1	4	77.5	27.125
2	5	93.5	32.225
3	6	111.5	38.025

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表 4 防水层上置挡土墙的基底摩擦系数

计算	双层卷材		单层卷材			防水涂料
竖向力/kN	27	32	27	32	38	27	32	38
水平力/kN	5.00	5.00	5.00	3.00	3.00	7.00	4.00	4.00
剪应力/kPa	12.50	12.50	12.50	7.50	7.50	17.50	10.00	10.00
摩擦系数	0.185	0.156	0.185	0.094	0.079	0.259	0.125	0.105
平均摩擦系数	0.14861

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