| 爆破和降雨作用下诱发含后缘裂缝岩质边坡失稳机制研究 |
| |
| 引用本文： | 王建明,陈忠辉,周子涵,张凌凡,张雪冬.爆破和降雨作用下诱发含后缘裂缝岩质边坡失稳机制研究[J].中国安全生产科学技术,2019,15(1):62-68. |
| |
| 作者姓名： | 王建明 陈忠辉 周子涵 张凌凡 张雪冬 |
| |
| 作者单位： | （中国矿业大学（北京） 力学与建筑工程学院 ，北京 100083） |
| |
| 基金项目： | 基金项目: 国家重点研发计划课题（2016YFC0801602） |
| |
| 摘 要： | 为了探讨爆破和降雨对边坡失稳的影响，基于边坡实际结构，提出了将滑面分为后缘张拉裂缝段、中部锁固段、下部剪切滑动段。利用断裂力学理论，分析了爆破和降雨双重工况下的裂缝起裂扩展判据。基于格里菲斯（Griffith）能量准则，推导了边坡滑动块断裂后沿底滑面的剧动距离。通过实例验证了理论计算的可行性和适用性，研究结果表明:边坡表面裂缝起裂的根本动力为降雨、爆破以及二者的共同作用；在一定外力条件下，裂缝起裂扩展存在最小临界深度；降雨和爆破共同作用时，裂缝扩展临界深度最小；中部锁固段长度为控制边坡失稳的关键因素；降雨并不能使裂缝扩展，预知裂缝深度时，可通过控制爆破药量来控制边坡失稳。
|
| 关 键 词： | 岩质边坡 裂缝扩展 临界爆破药量 应力强度因子 |
Study on instability mechanism of rock slope with trailing edge cracks induced by blasting and rainfall |
| |
| WANG Jianming,CHEN Zhonghui,ZHOU Zihan,ZHANG Lingfan,ZHANG Xuedong.Study on instability mechanism of rock slope with trailing edge cracks induced by blasting and rainfall[J].Journal of Safety Science and Technology,2019,15(1):62-68. |
| |
| Authors: | WANG Jianming CHEN Zhonghui ZHOU Zihan ZHANG Lingfan ZHANG Xuedong |
| |
| Affiliation: | (School of Mechanics and Civil Engineering, China University of Mining and Technology Beijing, Beijing 100083, China) |
| |
| Abstract: | In order to explore the influence of blasting and rainfall on the instability of slope, based on the practical structure of slope, it was proposed to divide the sliding surface into the trailing edge tensile crack section, the middle locking section and the lower shear sliding section. The criteria of crack initiation and propagation under the double working conditions of blasting and rainfall were analyzed by using the theory of fracture mechanics, then the dynamic distance along the bottom sliding surface after the fracture of slope sliding block was deduced based on the Griffith energy criterion, and the feasibility and applicability of the theoretical calculation were verified by an example. The results showed that the basic motive force of crack initiation on the slope surface was the rainfall, blasting and their combined effect. Under a certain conditions of external force, the crack initiation and propagation had the minimum critical depth, and the critical depth of crack propagation was the smallest under the combined effect of rainfall and blasting. The length of middle locking section was the key factor to control the instability of slope. The rainfall could not make the cracks propagate, and the instability of slope could be controlled through controlling the blasting charge when the crack depth was predicted. |
| |
| Keywords: | rock slope crack propagation critical blasting charge stress intensity factor |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《中国安全生产科学技术》浏览原始摘要信息 |
|
点击此处可从《中国安全生产科学技术》下载全文 |
