甘肃甘谷裂隙泥岩剪切蠕变行为及其修正模型研究

吴礼舟; 李部; 孙萍

甘肃甘谷裂隙泥岩剪切蠕变行为及其修正模型研究

吴礼舟^1, ,,
李部¹,
孙萍^2,

1.
成都理工大学地质灾害防治与地质环境保护国家重点试验室, 四川成都 610059
2.
中国地质科学院地质力学研究所, 北京 100081

基金项目:

国家自然科学基金面上项目 41472296

国家自然科学基金面上项目 41672282

详细信息

作者简介:
孙萍(1978-), 女, 博士, 副研, 主要从事工程地质、地质灾害方面的研究工作。E-mail:sunpingcgs@163.com

通讯作者:
吴礼舟(1975-), 男, 博士, 教授, 主要从事岩土工程科研教学工作。E-mail:wulizhou07@cdut.cn

中图分类号: T045;P642.22
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- 被引次数: 0
出版历程
- 收稿日期: 2017-05-14
- 刊出日期: 2017-12-01

STUDY ON SHEAR CREEP BEHAVIOR OF MUDSTONE AND ITS CORRECTION MODEL OF GANGU FISSURE IN GANSU

WU Lizhou^{1
, ,},
LI Bu¹,
SUN Ping^2
,

1.
State Key Laboratory of Geological Hazard Prevention and Geological Environment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

摘要

摘要: 岩石在长期荷载作用下表现出典型的蠕变特性，裂隙泥岩在长期荷载作用下的力学性质不同于完整岩石。对甘肃甘谷赵家窑滑坡钻孔取芯的裂隙泥岩开展剪切蠕变试验，探讨轴向压应力、预制裂隙长度等因素对试样剪切蠕变特征的影响。试验结果表明：轴向荷载和裂隙长度对试样剪切蠕变特征有明显的影响。轴向压应力越大，试样剪切蠕变变形越不明显；裂隙越长，试样剪切蠕变变形越显著。应力较低时，如Cvisc模型等蠕变模型能够较好反映泥岩的蠕变力学特性。而在加速蠕变阶段，大多数模型却不能准确体现泥岩蠕变曲线的非线性变化。改进的西原模型克服了传统模型不能对非线性蠕变特征进行描述的缺点，且模型参数较少，能较好地适用工程软弱岩体。不同载荷作用下泥质软岩试样剪切蠕变过程中，裂隙泥岩剪切破坏带形成表现为渐进与突发相结合。泥岩的剪切蠕变力学模型可解释泥岩滑坡的多种现象，边坡潜在滑移带内泥质软岩发生的剪切蠕变则是泥岩滑坡的内在诱因。
- 裂隙泥岩 /
- 剪切蠕变 /
- 蠕变模型 /
- 滑坡
Abstract: Rock shows typical creep property under long-term load, and the mechanical property of fractured mudstone are different from that of intact rock under long-term load. The shear creep test was carried out on the fractured mudstone from the drilled core at Gangu Zhaojiayao landslide in Gansu province, with investigation on the influence of axial compressive stress and the length of prefabricated cracks on the shear creep characteristics of samples. The experimental results show that axial load and crack length have obvious influence on the shear creep characteristics of the samples. The larger the axial compressive stress is, the less the shear creep deformation is. The longer the crack is, the more obvious the shear creep deformation is. When the stress is low, the creep model such as Cvisc model can better reflect the creep mechanical properties of the mudstone; however, in the accelerated creep stage, most of the models can not accurately reflect the nonlinear change of creep curves of the mudstone. The improved Nishihara (K-B) model with less model parameters overcomes the shortcoming that the traditional model cannot describe the nonlinear creep curves, and it can be better applied to engineering soft rock. In the process of shear creep of argillaceous soft rock samples under different loads, the formation of shear failure zone of fractured mudstone is characterized by the combination of gradual and sudden failure. The shear creep mechanical model of mudstone can explain many phenomena of mudstone landslide. The shear creep of the argillaceous soft rock in the potential slip zone of the slope is the intrinsic cause of the landslide.
- fractured mudstone /
- shear creep /
- creep model /
- landslide

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图 1 泥岩试样

Figure 1. Mudstone specimen

下载: 全尺寸图片幻灯片

图 2 裂隙加工示意图

H-岩石试件边长; a-为加工裂纹深度

Figure 2. Sketch map of fracture processing

下载: 全尺寸图片幻灯片

图 3 仪器装样及运行过程图

Figure 3. Instrument sample loading and running process diagram

下载: 全尺寸图片幻灯片

图 4 试样破坏特征

Figure 4. Damage characteristics of samples

下载: 全尺寸图片幻灯片

图 5 不同正应力下无裂隙试样剪切蠕变位移-时间分阶段曲线

Figure 5. Displacement-time curves of shear creep under different normal stresses of non-crack samples

下载: 全尺寸图片幻灯片

图 6 预制10 mm裂隙试样在不同正应力下剪切蠕变位移-时间曲线

Figure 6. Displacement-time curves of shear creep under different normal stresses of prefabricated 10 mm crack samples

下载: 全尺寸图片幻灯片

图 7 预制15 mm裂隙试样在不同正应力下剪切蠕变位移-时间曲线

Figure 7. Displacement-time curves of shear creep under different normal stresses of prefabricated 15 mm crack samples

下载: 全尺寸图片幻灯片

图 8 预制裂隙10 mm在不同正应力作用下剪切蠕变速率—时间曲线

Figure 8. Rate-time curves of shear creep under different normal stresses of prefabricated 10 mm crack samples

下载: 全尺寸图片幻灯片

图 9 预制裂隙15 mm在不同正应力作用下剪切蠕变速率—时间曲线

Figure 9. Rate-time curves of shear creep under different normal stresses of prefabricated 15 mm crack samples

下载: 全尺寸图片幻灯片

图 10 蠕变体的示意图及应变-时间曲线

Figure 10. Schematic diagram and axial strain-time curve of a creep mass

下载: 全尺寸图片幻灯片

图 11 改进的西原模型

Figure 11. The modified Nishihara model

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图 12 改进西原模型计算值与试验结果值的对比

Figure 12. Comparison between the modified Nishihara model and the experiment

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表 1 泥质软岩试样

Table 1. Parameters of pelitic soft rock sample

编号	裂隙长度a/mm	水平初始荷载τ/MPa	每级水平荷载增加τ/MPa	轴向荷载N/kN	轴向正应力σ/MPa
W1-3	0	0.56	0.56	1	0.28
W4-6	0	0.56	0.56	2	0.56
W7-9	0	0.56	0.56	3	0.83
L1-3	10	0.56	0.56	1	0.28
L4-6	10	0.56	0.56	2	0.56
L7-9	10	0.56	0.56	3	0.83
L10-12	15	0.56	0.56	1	0.28
L13-15	15	0.56	0.56	2	0.56
L16-18	15	0.56	0.56	3	0.83

下载: 导出CSV

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