砂岩拉-剪力学特性试验研究

黄达; 张永发; 朱谭谭; 陈洪凯

doi:10.11779/CJGE201902004

砂岩拉-剪力学特性试验研究 English Version

黄达^{1, 2},
张永发^1, ,,
朱谭谭¹,
陈洪凯³

1. 重庆大学山地城镇建设与新技术教育部重点实验室,重庆 400045;
2. 河北工业大学土木与交通学院,天津 300401;
3. 重庆交通大学岩土工程研究所,重庆 400074

基金项目: 国家自然科学基金项目（41472245,41672300）; 重庆市研究生科研创新项目（CYB17043）; 中央高校基本科研业务费项目（106112017CDJXSYY002）

详细信息

作者简介:
黄达(1976- ),男,博士,教授,博士生导师,主要从事岩体力学及地质灾害方面的研究与教学工作。E-mail: hdcqy@126.com。

通讯作者:
张永发，E-mail：zyfcqu@126.com

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出版历程
- 收稿日期: 2017-12-20
- 发布日期: 2019-02-24

Experimental study on tension-shear mechanical behavior of sandstone

1. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, China;
2. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;
3. Institute of Geotechnical Engineering, Chongqing Jiaotong University, Chongqing 400074, China

摘要

摘要: 岩体工程开挖和河谷下切均将致使岩体应力沿一个或多个方向卸荷,造成岩体应力场重分布。这种卸荷常造成岩体承受拉剪应力,使得卸荷岩体的破坏呈现明显张性特征。然而由于试验技术的限制,在法向拉应力作用下岩石剪切力学行为的试验研究仍非常困难。笔者研发了拉伸-双面剪切试验装置,可直接在常规微机控制伺服直剪试验机上进行试验（将法向压应力转换成拉应力）。采用此装置,开展了砂岩的拉剪试验,结果表明：拉-剪应力作用下岩石剪应力-剪位移曲线峰前仅出现初始非线性段和线性变形两个阶段（即没有峰前的屈服段）;砂岩抗剪强度和剪切刚度随法向拉应力的增大逐渐减小;Hoek-Brown准则比Mohr-Coulomb准则能更好的描述砂岩在拉剪应力下的强度特征;随着法向拉应力的增大,岩样破裂面张性特征越突出且形状更为平直。
- 拉剪应力 /
- 双面剪切 /
- 抗剪强度 /
- 刚度 /
- 破裂
Abstract: Rock excavation and river incision result in stress unloading in one or more directions, which leads to the redistribution of stress fields of rock masses in the influenced zone. The rock masses in the unloading zone commonly bear tension-shear stress, making the failure of unloading rocks exhibit obvious tensile property. However, due to the limitation of test technology, it is still quite difficult to study the shear mechanical behavior of rock under the action of normal tensile stress. In this study, a tension double-shear test auxiliary device that can be used by conventional direct shear testing machine is designed to convert the normal compressive force to the tensile one. The direct shear tests on sandstone under tensile normal stress are carried out using this device. The results show that under the tension-shear stress, the curves of shear stress versus shear displacement before peak stress only show two deformation stages of initial nonlinear deformation and linear deformation (namely without yield stage before peak). The shear strength and shear stiffness of sandstone gradually decrease with the increase of the normal tensile stress. Compared with the Mohr-Coulomb criterion, the Hoek-Brown criterion is better in describing the strength characteristics of sandstone under tensile shear stress. Besides, as the normal tensile stress increases, the rupture surface of rock specimen has more obvious tension and is straighter in shape.
- tension-shear stress /
- double-face shear /
- shear strength /
- stiffness /
- fracture

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参考文献(16)

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