| 高地应力区砂岩在卸荷条件下的变形参数劣化试验研究 |
| |
| 引用本文： | 胡政,刘佑荣,武尚,易威,王康.高地应力区砂岩在卸荷条件下的变形参数劣化试验研究[J].岩土力学,2014,35(Z1):78-84. |
| |
| 作者姓名： | 胡政 刘佑荣 武尚 易威 王康 |
| |
| 作者单位： | 1. 中国地质大学 工程学院，武汉 430074；2. 武汉市测绘研究院，武汉 430022 |
| |
| 基金项目： | 国家重点基础研究发展计划(973)项目资助(No.2011CB710603)；中国地质调查局“西部地区复杂山体滑坡成灾机理研究”资助(No.1212011014030)。 |
| |
| 摘 要： | 以锦屏某高边坡砂岩所赋存的高地应力环境为基础,开展峰前卸围压力学特性试验,研究了应力-应变全过程曲线、变形特征及参数劣化效应。试验结果表明,相对于加载试验,岩样卸荷破坏表现出明显的脆性特征,相同初始围压下卸荷破坏所需偏应力较加载试验少;卸荷过程横向应变和体积应变急剧增大,卸荷方向表现出明显的扩容特征;当初始围压小于某一值(30 MPa),岩样破坏所需卸荷量随初始围压增大而增大,当初始围压达到一定值(40 MPa时),脆性特征更加明显,很少的卸荷量即可引起岩样破坏。以表征岩石卸荷程度的卸荷量H为参变量,分别对高、低围压下卸荷过程中变形参数(变形模量和泊松比)随卸荷量变化关系进行拟合,得到高、低地应力区卸荷过程中变形劣化参数的关系式。试验结果和计算方法对高应力区边坡开挖的稳定性评价具有一定指导意义。
|
| 关 键 词： | 卸荷 高应力 变形参数 劣化效应 |
| 收稿时间： | 2013-06-11 |
Experimental study of deformation parameters degradation of sandstone in high geostress regions under unloading conditions |
| |
| HU Zheng
,
LIU You-rong
,
WU Shang
,
YI Wei
,
WANG Kang.Experimental study of deformation parameters degradation of sandstone in high geostress regions under unloading conditions[J].Rock and Soil Mechanics,2014,35(Z1):78-84. |
| |
| Authors: | HU Zheng LIU You-rong WU Shang YI Wei WANG Kang |
| |
| Institution: | 1. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China; 2. Wuhan Institute of Surveying and Mapping, WuHan 430022, China |
| |
| Abstract: | Based on the sandstone’s high geostress area from where a high slope in Jinping, a series of pre-peak unloading tests have been carried out; and the complete stress-strain curve, deformation characteristics and degradation effect of deformation parameters are studied. The test results show that compared to loading failure, the rock’s brittle characteristics of unloading failure is obvious; and unloading failure needs lower deviatoric stress under the same initial confining pressure. The lateral strain and volumetric strain increase sharply in the process of unloading; and the expansion characteristics in the unloading direction is obvious. When the initial confining pressure is less than a value(30 MPa), the rock’s failure unloading percentage would increase along with initial confining pressure’s enlargement. But when initial confining pressure grow up to a value(40 MPa), the brittle characteristics is very obvious; and a few unloading percentage can cause the rock failure. Taking unloading percentage H which expresses unloading level as variable quantity, and making fitting of deformation parameters when in high and low stress. We get the functions between deformation degradation parameters and unloading percentage under unloading process. The test results and calculation method could benefit excavation for the stability analysis of slope under high geostress. |
| |
| Keywords: | unloading high stress deformation parameters degradation effect |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
