| 软-陡基底排土场边坡破坏模式与机理 |
| |
| 作者姓名： | 王家臣 李阳春 徐文彬 栾茂旭 |
| |
| 作者单位： | 中国矿业大学(北京)能源与矿业学院,北京 100083;中国矿业大学(北京)能源与矿业学院,北京 100083;中国矿业大学(北京)能源与矿业学院,北京 100083;中国矿业大学(北京)能源与矿业学院,北京 100083 |
| |
| 基金项目： | 国家重点研发计划2018YFC0808403 |
| |
| 摘 要： | 针对西藏甲玛铜矿角岩排土场基底倾角大、表土层软的特点，以该地区排土场为工程背景，基于相似模拟原理，采用底摩擦试验与数值模拟相结合的方法，进行了软-陡基底排土场失稳模式和机理研究；通过非接触式位移监测系统获得了排土场变形移动演化规律。试验结果表明:①软-陡基底排土场变形失稳大致分为坡脚卸荷变形、垂直张拉裂缝贯通和张拉裂缝扩展三个阶段；②基底软弱土层受压，坡脚处软弱土层受剪切作用明显，是滑移变形失稳触发地带；③潜在滑移面穿过软弱土层，形成近似圆弧滑面。软-陡基底排土场失稳破坏主要呈现沉降、拉裂和滑移模式。
|
| 关 键 词： | 软弱层 倾斜基底 排土场 破坏模式 失稳机理 |
| 收稿时间： | 2020-08-25 |
Failure mode and mechanism of mine waste dump with a soft and steep layer base |
| |
| Affiliation: | School of Energy and Mining Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China |
| |
| Abstract: | The waste dump of Tibet Jiama Copper Mine, which has a steep and soft base, is taken as the engineering background to reveal the failure mode and mechanism with assistance of similarity simulation principle.Using a method combining bottom friction test and numerical simulation.The deformation evolution of the waste dump is obtained by the contactless displacement monitoring system.The experimental results show that: ①The deformation and instability of the soft steep base dump can be divided into three stages: unloading deformation at the slope toe, vertical tensile crack penetration and tensile crack propagation.②The soft soil layer at the base is compressed and the soft soil layer at the slope toe is subjected to shearing.The slope toe is the trigger zone for slipping deformation and instability.③The potential slip surface passes through the soft soil layer to form an approximate circular arc slip surface.The instability failure of the soft-steep base dump mainly presents the modes of settlement, cracking and slippage. |
| |
| Keywords: | |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《》浏览原始摘要信息 |
|
点击此处可从《》下载全文 |
|
