黄土−三趾马红土滑坡滑带土的长期强度影响因素研究

祝艳波; 刘振谦; 李文杰; 苗帅升; 李红飞; 兰恒星

doi:10.16030/j.cnki.issn.1000-3665.202104012

黄土−三趾马红土滑坡滑带土的长期强度影响因素研究

长安大学地质工程与测绘学院, 陕西西安　710054

基金项目: 国家自然科学基金面上项目（41877247）；国家自然科学基金重大项目（41790443）

详细信息

作者简介: 祝艳波（1985-），男，博士，副教授，硕士生导师，主要从事岩土力学方面科研与教学工作。E-mail：zhuyanbo@chd.edu.cn

中图分类号: P642.2

收稿日期: 2021-04-06

修回日期: 2021-06-08

刊出日期: 2022-03-15

Experimental investigation of influencing factors on the long-term strength of sliding zones of the Loess-Hipparion laterite landslide

College of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi　710054, China

Received Date: 06 April 2021

Revised Date: 08 June 2021

Publish Date: 15 March 2022

摘要

摘要:
西北地区三趾马红土广泛分布，其蠕变特性强、变形后强度衰减明显，为典型的易滑地层。以往研究较少关注三趾马红土的长期强度衰减规律，为探讨三趾马红土强度时间效应，文章开展三趾马红土蠕变试验研究，获取其蠕变全过程曲线；利用等时曲线法求取其长期强度，并分析影响因素对长期强度影响的敏感性。结果表明：三趾马红土蠕变性强，蠕变特性受初始条件影响显著，试样干密度越小、含水率越高、试验围压越小，其蠕变变形量越大；三趾马红土蠕变变形后强度衰减明显，强度损失率为6.67%～34.58%，干密度越小、含水率越高、围压越小其长期强度越低；三趾马红土长期强度衰减随影响因素变化敏感性不同，随含水率变化最为敏感，随围压变化敏感性次之，随干密度变化敏感性最低；三趾马红土强度损失率变化则呈现不同规律，干密度越小、含水率越高、围压越低，其强度损失率越大，且其变化幅度随围压变化最为敏感，随含水率变化次之，随干密度变化敏感性最低。
- 三趾马红土 /
- 蠕变曲线 /
- 长期强度 /
- 滑坡 /
- 黄土
Abstract:
The Hipparion laterite with strong creep characteristics and obvious strength attenuation after deformation is widely distributed in northwest China. However, previous studies have paid little attention to the long-term strength attenuation of the Hipparion laterite. In order to investigate the time effect of strength of the Hipparion laterite, the creep test of samples under different influence factors is carried out. The long-term strength is calculated by using the isochronal curve method based on the creep curves, and the sensitivity of influencing factors to the long-term strength is analyzed. The results indicate that the Hipparion laterite has strong creep characteristics, which are affected by the density, moisture content of samples and confining pressure. The smaller the dry density, the higher the moisture content of the samples, and the smaller the confining pressure, the greater the deformation of the sample in the creep process. After creep deformation, the strength of the Hipparion laterite decreases obviously with a strength loss rate of 6.67%−34.58%, which varies with the influence factors. The sensitivity of the long-term strength attenuation of the Hipparion laterite is different with the change of the influencing factors. The long-term strength is the most sensitive to the change of water content, followed by the change of confining pressure, and is the lowest with the change of dry density. The change of the strength loss rate of the Hipparion laterite presents different rules. The smaller the dry density is, the higher the water content is, and the lower the confining pressure is, the greater the strength loss rate is. The change range of the long-term strength loss rate is the most sensitive to the change of confining pressure, followed by the change of water content, and the long-term strength loss rate is the lowest with the change of dry density.
- Hipparion laterite /
- creep curve /
- long-term strength /
- landslide /
- loess

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图 1 研究区及试验土料（据文献[30]修改）

Figure 1.

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图 2 干密度对试样强度的影响

Figure 2.

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图 3 含水率对试样强度的影响

Figure 3.

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图 4 围压对试样强度的影响

Figure 4.

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图 5 干密度1.8 g/cm³试样蠕变曲线

Figure 5.

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图 6 含水率23%试样蠕变曲线

Figure 6.

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图 7 围压300 kPa试样蠕变曲线

Figure 7.

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图 8 蠕变等时曲线

Figure 8.

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图 9 不同影响因素对试样等时曲线的影响

Figure 9.

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图 10 双对数等时曲线

Figure 10.

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图 11 不同因素对试样长期强度及强度损失率的影响

Figure 11.

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图 12 试样长期强度随影响因素变化敏感性

Figure 12.

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表 1 基本物理性质参数

Table 1. Basic physical property indexes

土样	比重	液限 /%	塑限 /%	塑性指数	干密度/ （g·cm⁻³）
三趾马红土	2.73	58.68	28.72	29.96	2.32

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表 2 蠕变试验加载方案

Table 2. Loading schemes for the creeping test

试样编号	干密度/（g·cm⁻³）	含水率/%	围压/kPa	剪切强度q_f/kPa	荷载q/kPa
1	1.5	20	100	587	125.00, 250.00, 375.00, 500.00, 625.00, 750.00
2	1.6	20	100	680	156.00, 312.00, 468.00, 624.00, 780.00
3	1.7	20	100	1121	218.75, 437.50, 656.25, 875.00, 1091.25
4	1.8	20	100	1229	218.75, 437.50, 656.25, 875.00, 1093.75, 1312.50
5	1.8	15	100	2260	500.00, 1000.00, 1500.00, 2000.00, 2500.00, 3000.00
6	1.8	18	100	1620	375.00, 750.00, 1125.00, 1500.00, 1875.00, 2250.00
7	1.8	20	100	1229	218.75, 437.50, 656.25, 875.00, 1093.75, 1312.50
8	1.8	23	100	600	125.00, 250.00, 375.00, 500.00, 625.00, 750.00
9	1.8	20	100	1229	218.75, 437.50, 656.25, 875.00, 1093.75, 1312.50
10	1.8	20	200	1380	250.00, 500.00, 750.00, 1000.00, 1250.00, 1500.00
11	1.8	20	300	1500	281.25, 562.50, 843.75, 1125.00, 1406.25, 1687.50

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