长期静水浸泡对三峡库区滑带土物理-化学-力学性质的影响

张迪; 李岚星; 胡新丽; 牛李飞; 王斌; 王强

doi:10.19509/j.cnki.dzkq.2021.0041

长期静水浸泡对三峡库区滑带土物理-化学-力学性质的影响

doi: 10.19509/j.cnki.dzkq.2021.0041

张迪^1,,
李岚星¹,
胡新丽^1, ,,
牛李飞¹,
王斌²,
王强¹

基金项目:

国家自然科学基金重点项目 41630643

详细信息

作者简介:
张迪(1996-), 男, 现正攻读地质工程专业硕士学位, 主要从事地质灾害分析与防治的研究工作。E-mail: zhangdi@cug.edu.cn

通讯作者:
胡新丽(1968-), 女, 教授, 博士生导师, 主要从事岩土工程数值模拟与稳定性评价等方面的研究工作。E-mail: huxinli@cug.edu.cn

中图分类号: P642.22
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出版历程
- 收稿日期: 2020-12-28

Effect of long-term immersion in static water on the physical, chemical, and mechanical properties of sliding zone soil in the Three Gorges Reservoir area

摘要

摘要: 三峡水库蓄水使得库岸大量土体长期处于浸泡状态，导致土体软化从而诱发滑坡失稳。为研究长期浸泡对滑坡土体物理-化学-力学性质的影响，以马家沟滑坡原状滑带土为对象开展了浸泡软化试验，通过比较不同浸泡时间滑带土的粒度分布、界限含水率、化学与矿物成分、剪切特性等特征，探讨了滑带土浸泡软化机理。研究结果表明：浸泡过程中滑带土中Ca²⁺、Mg²⁺等离子流失较多，但矿物成分无变化；浸泡后滑带土出现阶段性粒度细化现象，液塑限和塑性指数均随黏粒含量增加而增大；随着浸泡时间增加，滑带土应力应变关系在低法向应力下由强软化型变为弱软化型，在高法向应力下由软化型变为硬化型；滑带土抗剪强度参数随着浸泡时间增加呈指数形式降低，黏聚力c降低程度大于内摩擦角φ。研究成果可以为水库滑坡稳定性评价提供理论依据。
- 水库滑坡 /
- 滑带土 /
- 浸泡软化 /
- 物理化学性质 /
- 抗剪强度
Abstract: The impoundment of the Three Gorges Reservoir has caused a large amount of soil on the bank to be immersed for a long time, which may cause the soil softened and induce instability of landslide.In order to study the effect of long-term immersion on the physical, chemical and mechanical properties of the landslide soil, the immersion softening test is carried out on the undisturbed sliding zone soil of Majiagou landslide.By comparing the particle size distribution, limit moisture content, the characteristics of chemical and mineral composition, shear characteristics, etc., this paper discusses the immersion softening mechanism of sliding zone soil.The results show that ions, such as Ca²⁺, Mg²⁺ in the sliding zone soil are largely lost during the immersion process, but the mineral composition does not change.After the immersion, the sliding zone soil appears staged particle size refinement, with which the liquid limit, plastic limit and plasticity index increase.As the immersion time increases, the stress-strain relationship of the sliding zone soil changes from a strong softening type to a weakly softening type under low normal stress, and from a softening type to a hardening type under high normal stress.The shear strength parameters decrease exponentially with the increase of immersion time, and the decrease of cohesion is greater than internal friction angle.The research results can provide a theoretical basis for the stability evaluation of reservoir landslide.
- reservoir landslide /
- sliding zone soil /
- immersion softening /
- physical and chemical properties /
- shear strength

HTML全文

图 1 马家沟滑坡全貌图^[1]

Figure 1. Boundary of the Majiagou landslide

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图 2 马家沟滑坡剖面图^[2]

Figure 2. Profile of the Majiagou landslide

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图 3 滑带土颗粒级配曲线

Figure 3. Particle size distribution curve of sliding zone soil

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图 4 滑带土浸泡软化试验设计

Figure 4. Design of immersion softening test for sliding zone soil

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图 5 滑带土静水浸泡

Figure 5. Sliding zone soil immersion in static water

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图 6 不同浸泡时间上清液主要阳离子质量浓度

Figure 6. Main cationic concentration of supernatant with different durations of immersion

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图 7 不同浸泡时间滑带土粒度分布

Figure 7. Particle size distribution of sliding zone soil with different durations of immersion

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图 8 不同浸泡时间滑带土界限含水率

Figure 8. Limit moisture content of sliding zone soil with different durations of immersion

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图 9 不同浸泡时间滑带土剪应力-位移曲线

Figure 9. Shear stress-displacement curve of sliding zone soil with different durations of immersion

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图 10 不同浸泡时间滑带土抗剪强度包络线

Figure 10. Shear strength envelope of sliding zone soil with different durations of immersion

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图 11 滑带土抗剪强度参数衰减模型

Figure 11. Attenuation model of shear strength parameters of sliding zone soil

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图 12 长期浸泡滑带土物理-化学-力学性质变化示意图

Figure 12. Changes of physical, chemical and mechanical properties of sliding zone soil with long-term immersion

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表 1 滑带土基本物理力学参数

Table 1. Physical properties of sliding zone soil

干密度ρ_d/(g·cm^-3)	天然含水率ω/%	相对密度G_s	塑限ω_P/%	液限ω_L/%
1.97	15.42	2.62	16.03	29.76

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表 2 不同浸泡时间上清液所含阳离子及pH(浸泡时间0 d为去离子水)

Table 2. Cationic and pH of supernatant with different durations of immersion

浸泡时间/d	Ag⁺		Ba²⁺		Ca²⁺		K⁺		Mg²⁺		Na⁺		Si		pH
浸泡时间/d	ρ_B/(mg·L^-1)	占比/%	ρ_B/(mg·L^-1)	占比/%	ρ_B/(mg·L^-1)	占比/%	ρ_B/(mg·L^-1)	占比/%	ρ_B/(mg·L^-1)	占比/%	ρ_B/(mg·L^-1)	占比/%	ρ_B/(mg·L^-1)	占比/%	pH
0	0.00	0.00	0.00	0.00	4.69	98.12	0.07	1.46	0.02	0.42	0.00	0.00	0.00	0.00	7.18
1	0.05	0.33	0.06	0.39	9.62	62.88	0.65	4.25	0.96	6.27	2.27	14.84	1.69	11.05	7.34
4	0.07	0.24	0.09	0.31	17.00	58.95	1.12	3.88	1.70	5.89	5.89	20.42	2.97	10.30	7.26
7	0.01	0.04	0.09	0.33	18.78	68.99	0.48	1.76	1.95	7.16	3.74	13.74	2.17	7.97	7.44
10	0.05	0.14	0.12	0.34	23.81	68.07	0.65	1.86	2.43	6.95	4.92	14.07	3.00	8.58	6.71
14	0.05	0.13	0.18	0.46	26.35	67.43	0.86	2.20	2.69	6.88	5.56	14.23	3.39	8.67	7.59
18	0.02	0.05	0.18	0.44	27.53	66.98	1.04	2.53	2.89	7.03	6.05	14.72	3.39	8.25	6.94
24	0.01	0.02	0.20	0.48	29.08	69.82	0.76	1.82	3.05	7.32	5.59	13.42	2.96	7.11	7.14
30	0.03	0.07	0.21	0.48	30.22	68.37	0.89	2.01	3.28	7.42	6.10	13.80	3.47	7.85	6.68

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表 3 不同浸泡时间滑带土矿物成分

Table 3. Mineral composition of sliding zone soil with different durations of immersion

浸泡时间/d	方解石	蒙脱石	绿泥石	伊利石	高岭石	石英	长石
浸泡时间/d	w_B/%
0	7.41	26.74	5.26	28.32	6.27	13.44	12.56
1	8.04	26.22	6.84	27.35	6.84	14.89	9.83
4	5.42	27.76	4.66	28.65	6.75	12.07	14.69
7	6.91	25.98	5.50	29.63	6.71	16.70	8.57
10	7.54	25.61	6.08	25.28	5.17	19.98	10.34
14	5.78	25.08	3.67	27.18	3.67	20.19	14.43
18	6.25	25.61	8.45	20.20	8.45	20.89	10.14
24	8.71	27.76	9.00	27.29	3.03	14.92	9.30
30	8.76	27.92	9.44	26.50	3.05	15.01	9.33

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表 4 地下水水质分析

Table 4. Quality analysis of the groundwater

水类型	离子成分ρ_B/(mg·L^-1)							pH	含盐量ρ_B/ (mg·L^-1)
水类型	Ca²⁺	Mg⁺	Na⁺	K⁺	Cl^-	SO₄^2-	HCO₃^-	pH	含盐量ρ_B/ (mg·L^-1)
地下水	67.22	8.51	7.84	1.85	14.18	3.84	249.57	7.50	360.17

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表 5 化学反应方程式

Table 5. Chemical reaction equation

现象	化学方程式
胶结物溶解	CaCO₃+CO₂+H₂O→Ca²⁺+HCO₃^- MgCO₃+CO₂+H₂O→Mg²⁺+HCO₃^-
离子交换	土粒-Ca²⁺+2Na⁺→土粒-2Na⁺+Ca²⁺ 土粒-Ca²⁺+2K⁺→土粒-2K⁺+Ca²⁺ 蒙脱石-Ca²⁺+2H⁺→蒙脱石-2H²⁺+Ca²⁺

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表 6 不同浸泡时间滑带土抗剪强度参数

Table 6. Shear strength parameters of sliding zone soil with different durations of immersion

浸泡时间/d	黏聚力c/kPa	内摩擦角φ/(°)
0	75.46	19.34
1	71.85	18.58
4	66.28	17.66
7	59.30	16.44
10	57.10	15.98
14	55.45	15.75
18	54.65	15.71
24	53.97	15.63
30	53.66	15.58

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长期静水浸泡对三峡库区滑带土物理-化学-力学性质的影响

doi: 10.19509/j.cnki.dzkq.2021.0041

作者简介:
张迪(1996-), 男, 现正攻读地质工程专业硕士学位, 主要从事地质灾害分析与防治的研究工作。E-mail: zhangdi@cug.edu.cn

通讯作者:
胡新丽(1968-), 女, 教授, 博士生导师, 主要从事岩土工程数值模拟与稳定性评价等方面的研究工作。E-mail: huxinli@cug.edu.cn

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Effect of long-term immersion in static water on the physical, chemical, and mechanical properties of sliding zone soil in the Three Gorges Reservoir area

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留言板

长期静水浸泡对三峡库区滑带土物理-化学-力学性质的影响

doi: 10.19509/j.cnki.dzkq.2021.0041

作者简介: 张迪(1996-), 男, 现正攻读地质工程专业硕士学位, 主要从事地质灾害分析与防治的研究工作。E-mail: zhangdi@cug.edu.cn

通讯作者: 胡新丽(1968-), 女, 教授, 博士生导师, 主要从事岩土工程数值模拟与稳定性评价等方面的研究工作。E-mail: huxinli@cug.edu.cn

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Effect of long-term immersion in static water on the physical, chemical, and mechanical properties of sliding zone soil in the Three Gorges Reservoir area

计量

出版历程

目录

作者简介:
张迪(1996-), 男, 现正攻读地质工程专业硕士学位, 主要从事地质灾害分析与防治的研究工作。E-mail: zhangdi@cug.edu.cn

通讯作者:
胡新丽(1968-), 女, 教授, 博士生导师, 主要从事岩土工程数值模拟与稳定性评价等方面的研究工作。E-mail: huxinli@cug.edu.cn