| 基于一种重塑性制样方法的节理黄土力学特性试验研究? |
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| 引用本文： | 王丽丽,李宁,何敏,刘青霞.基于一种重塑性制样方法的节理黄土力学特性试验研究?[J].防灾减灾工程学报,2020(1):35-42. |
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| 作者姓名： | 王丽丽 李宁 何敏 刘青霞 |
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| 作者单位： | 西安理工大学岩土工程研究所,陕西 西安 710048;中国地震局兰州地震研究所 黄土地震工程重点实验室,甘肃 兰州 730070;西安理工大学岩土工程研究所,陕西 西安 710048;兰州交通大学土木工程学院,甘肃 兰州 730070 |
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| 基金项目： | 中国地震局地震预测所基本科研业务费专项资金（2019IESLZ05）、中国地震局地震预测所基本科研业务费专项（2016IESLZ04）、国家自然科学基金项目（11572246, 51779207）资助 |
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| 摘 要： | 黄土节理是控制黄土地基、边坡和地下工程破坏与稳定性的重要因素,探讨节理性黄土的破坏特性对于了解边坡后缘拉裂演化过程、滑动面的生成具有重要意义。针对原状节理性黄土室内试验试样制备困难的问题,考虑节理面低强度、弱胶结的特点,以一种接触面模拟材料为载体,结合重塑制样的方法,提出一种节理性黄土室内三轴试样的制样方法,通过重塑试样与原状试样的节理面抗拉强度对比分析,验证该方法的合理性和有效性。在此基础上,开展节理性黄土的无侧限抗压强度试验和三轴压缩试验,讨论节理性黄土试样的强度与破坏规律。研究结果表明:节理的存在对试样强度和破坏的影响与节理倾角和围压大小有关,表现为低围压和45°倾角时的低强度效应;"沿节理面滑动破坏"与"破裂面与节理面呈X型共轭剪切破坏"是无侧限和三轴条件下的含单条贯通型节理性试样的两种典型破坏模式;非贯通型节理性试样的抗压破坏主要为"破裂面与节理面贯通型破坏"与"破裂面与节理面非贯通型破坏"两种类型。
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| 关 键 词： | 黄土节理 倾角效应 节理尺寸 破坏特性 |
Experimental Study on Mechanical Properties of Jointed Loess based on a Remouldling Sample Method |
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| WANG Lili,LI Ning,HE Min,LIU Qingxia.Experimental Study on Mechanical Properties of Jointed Loess based on a Remouldling Sample Method[J].Journal of Disaster Prevent and Mitigation Eng,2020(1):35-42. |
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| Authors: | WANG Lili LI Ning HE Min LIU Qingxia |
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| Abstract: | Loess joint is an important factor to affect the failure mechanism and stability of loess foundation and slope. Discussing the failure characteristics of jointed loess is of great significance for understanding the evolution process of tensile crack at the back edge of slope and the generation of sliding surface. In view of the difficulty in preparation of undisturbed jointed loess samples, considering the characteristics of low strength and weak cementation of jointed surface, a method of remodling jointed triaxial samples is proposed by using a kind of interface simulation material as a carrier and combining with remolding method. The rationality and validity of the method are verified by comparing the tensile strength of the joint surface between the remolded samples and the original samples. On this basis, the unconfined compressive strength test and triaxial compressive test of jointed loess are carried out, and the strength and failure law of jointed loess samples are discussed. The results show that the influence of joints on the strength and failure of specimens is related to the dip angle and confining pressure, which shows the effect of low strength at low confining pressure and large dip angle. sliding failure along the joint plane and X-shaped conjugate shear failure between the fracture surface and the joint plane are two typical failure modes of samples with one single through joint under unconfined and triaxial conditions. The compressive failure of non-penetrating jointed samples is mainly divided into "through-type failure of fracture surface and joint surface" and "non-penetrating -type failure of fracture surface and joint surface". |
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