含砾滑带土残余强度与剪切面粗糙度的细观响应机制

任三绍; 张永双; 徐能雄; 吴瑞安

doi:10.11779/CJGE202108012

含砾滑带土残余强度与剪切面粗糙度的细观响应机制 English Version

任三绍^{1, 2, 3,},
张永双^{1, 3, ,},
徐能雄²,
吴瑞安⁴

1.
中国地质科学院水文地质环境地质研究所,河北　石家庄　050061
2.
中国地质大学(北京),北京　100083
3.
中国地质调查局第四纪年代学与水文环境演变重点实验室,河北　石家庄　050061
4.
中国地质科学院地质力学研究所,北京　100081

基金项目:

国家自然科学基金重点项目 41731287

国家自然科学基金重大专项项目 41941017

详细信息

作者简介:
任三绍(1991— ),男,博士研究生,主要从事工程地质与地质灾害研究工作。E-mail：rensanshao123@163.com

通讯作者:
张永双, E-mail：zhys100@sohu.com

中图分类号: TU433
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- 文章访问数: 285
- HTML全文浏览量: 28
- PDF下载量: 140
出版历程
- 收稿日期: 2020-08-11
- 网络出版日期: 2022-12-02
- 刊出日期: 2021-07-31

Mesoscopic response mechanism of shear surface roughness and residual strength in gravelly sliding zone soils

REN San-shao^{1, 2, 3,},
ZHANG Yong-shuang^{1, 3, ,},
XU Neng-xiong²,
WU Rui-an⁴

1.
Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China
2.
China University of Geosciences, Beijing 100083, China
3.
Key Laboratory of Quaternary Chronology and Hydrological Environmental Evolution, China Geological Survey, Shijiazhuang 050061, China
4.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

摘要

摘要: 含砾滑带土的力学性质与剪切面细观结构紧密相关,定量化表征剪切面的粗糙度对于揭示含砾滑带土残余强度变化的细观机制具有重要意义。基于反复直剪试验和高精度三维激光扫描技术,对含砾滑带土剪切面的粗糙度进行了定量刻画,并剖析了其与残余强度参数之间的关系,结果表明：滑带土剪切面摩擦系数与粗糙度呈较明显的相关性；砾石是滑带土残余强度变化的内在因素,垂向应力和水是残余强度变化的外部因素。含砾滑带土的残余强度由剪切面砾石的接触性质和剪切面的起伏程度共同决定：砾石含量决定了咬合摩擦接触面的数量,随含石量增大,剪切面中咬合摩擦接触面增加；砾石最大粒径控制了接触面积和夹角,粒径越大,咬合摩擦越大；垂向应力的压实作用和水的软化作用有助于咬合摩擦向滑动摩擦转化,减小滑带土的残余强度。
- 含砾滑带土 /
- 残余强度 /
- 剪切面粗糙度 /
- 三维激光扫描 /
- 细观机制
Abstract: The mechanical properties of the gravelly sliding zone soils are closely related to the meso-structure of the shear surface. The quantitative characterization of shear surface roughness is of great significance to revealing the meso-mechanism of change of the residual strength in the gravelly sliding zone soils. Based on the reversal direct shear tests and the high-resolution 3D laser scanning technology, the shear surface roughness of the gravelly sliding zone soils is quantitatively characterized, and the relationship between the roughness and the residual strength parameters is analyzed. The results show that there is a positive linear correlation between the friction coefficient and the shear surface roughness. The gravels are the internal factor of the change of the residual strength of sliding zone soils, and vertical stress and water are the external factors. The residual strength of the gravelly sliding zone soils is determined by the contact properties of gravels on the shear surface and the shear surface undulation. The number of occlusive friction contact surfaces depends on the gravel content, and with the increase of gravels content, the occlusive friction interface increases. The maximum particle size of gravel controls the contact area and angle, and the larger the particle size, the greater the occlusive friction. The soil compaction under normal stress and the softening of fine-grained soil due to water are helpful to the transformation of occlusive friction to sliding friction, thus leading to lower residual strength of the sliding zone soils.
- gravelly sliding zone soil /
- residual strength /
- shear surface roughness /
- 3D laser scanning /
- meso-mechanism

HTML全文

感谢中国地质科学院地质力学研究所郭长宝研究员、成都理工大学裴向军教授、崔圣华博士和东华大学杨爱武教授在野外调查和试验过程中给予的指导和帮助,感谢各位专家及编辑在审稿过程中对本文提出的宝贵修改意见。

图 1 江顶崖滑坡滑带土发育特征

Figure 1. Development characteristics of sliding zone soils in Jiangdingya

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图 2 剪切面三维形貌提取流程

Figure 2. Extraction process of 3D morphology of shear surface

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图 3 残余强度参数与砾石含量、最大粒径的关系

Figure 3. Relationship among residual strength parameters, gravel content and maximum particle size

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图 4 剪切面摩擦系数与粗糙度的关系

Figure 4. Relationship between friction coefficient and roughness of shear surface

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图 5 不同最大粒径下剪切面等值线图（饱和,300 kPa）

Figure 5. Contour map of shear surface morphology under different maximum particle sizes (saturated, 300 kPa)

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图 6 剪切面摩擦系数、粗糙度与砾石最大粒径的关系

Figure 6. Relationship among friction coefficient, roughness of shear surface and maximum particle size of gravels

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图 7 剪切面摩擦系数、粗糙度与砾石含量的关系（饱和）

Figure 7. Relationship among friction coefficient, roughness and gravels content (saturated)

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图 8 不同垂向应力下剪切面等值线图（饱和,砾石含量30%）

Figure 8. Contour map of shear surface morphology under different normal stresses (saturated, gravel content of 30%)

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图 9 剪切面摩擦系数、粗糙度与垂向应力的关系

Figure 9. Relationship among friction coefficient, roughness and normal stress of shear surface

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图 10 不同状态下摩擦系数、粗糙度与垂向应力的关系（砾石含量30%）

Figure 10. Relationship among friction coefficient, roughness and normal stress under different states (gravel content of 30%)

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图 11 剪切面起伏形态概化模式图

Figure 11. Generalized model for shear surface fluctuation

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图 12 含砾滑带土剪切面中的砾石分布特征

Figure 12. Distribution characteristics of gravels on shear surface

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图 13 剪切面摩擦示意图

Figure 13. Schematic diagram of shear surface friction

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图 14 接触单元i受力示意图

Figure 14. Stress diagram of contact unit i

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表 1 滑带土基本物理力学指标

Table 1 Basic physical and mechanical indexes of sliding zone soils

孔隙比 $e_{0}$	土粒相对质量密度 $G_{s}$	干密度/(g·cm^-3)	塑限 $w_{L}$ /%	液限 $w_{P}$ /%	塑性指数 $I_{P}$	颗粒级配/%
孔隙比 $e_{0}$	土粒相对质量密度 $G_{s}$	干密度/(g·cm^-3)	塑限 $w_{L}$ /%	液限 $w_{P}$ /%	塑性指数 $I_{P}$	<0.005 mm	0.005~0.075 mm	0.075~2 mm	>2 mm
0.579~0.673	2.72~2.73	1.86~1.96	15.4~16.7	34.2~35.8	18.8~20.4	14~19	26~32	32~36	15~24

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表 2 滑带土剪切试验方案

Table 2 Schemes for shear tests on sliding zone soils

试验编号	状态	含水率/%	样品颗粒配比/%				垂向应力/kPa	试验编号	状态	含水率/%	样品颗粒配比/%				垂向应力/kPa
试验编号	状态	含水率/%	<2 mm	2~5 mm	5~10 mm	10~20 mm	垂向应力/kPa	试验编号	状态	含水率/%	<2 mm	2~5 mm	5~10 mm	10~20 mm	垂向应力/kPa
JDY-01	天然	13.5	70	18	12	0	100	JDY-23	饱和	24.7	90	6	4	0	500
JDY-02							300	JDY-24	饱和	24.7	90	6	4	0	700
JDY-03							500	JDY-25	天然	13.5	100	0	0	0	100
JDY-04							700	JDY-26							300
JDY-05	饱和	24.7	70	18	12	0	100	JDY-27							500
JDY-06							300	JDY-28							700
JDY-07							500	JDY-29	饱和	24.7	100	0	0	0	100
JDY-08							700	JDY-30							300
JDY-09	天然	13.5	80	12	8	0	100	JDY-31							500
JDY-10							300	JDY-32							700
JDY-11							500	JDY-33	饱和	24.7	70	30	0	0	100
JDY-12							700	JDY-34							300
JDY-13	饱和	24.7	80	12	8	0	100	JDY-35							500
JDY-14							300	JDY-36							700
JDY-15							500	JDY-37	饱和	24.7	70	15	15	0	100
JDY-16							700	JDY-38							300
JDY-17	天然	13.5	90	6	4	0	100	JDY-39							500
JDY-18							300	JDY-40							700
JDY-19							500	JDY-41	饱和	24.7	70	10	10	10	100
JDY-20							700	JDY-42							300
JDY-21	饱和	24.7	90	6	4	0	100	JDY-43							500
JDY-22	饱和	24.7	90	6	4	0	300	JDY-44							700

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