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[1]王建明,陈忠辉,周子涵,等.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.[doi:10.11731/j.issn.1673-193x.2019.01.010]
 WANG Jianming,CHEN Zhonghui,ZHOU Zihan,et al.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.[doi:10.11731/j.issn.1673-193x.2019.01.010]
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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
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
15
期数:
2019年1期
页码:
62-68
栏目:
职业安全卫生管理与技术
出版日期:
2019-01-31

文章信息/Info

Title:
Study on instability mechanism of rock slope with trailing edge cracks induced by blasting and rainfall
文章编号:
1673-193X(2019)-01-0062-07
作者:
王建明陈忠辉周子涵张凌凡张雪冬
(中国矿业大学(北京) 力学与建筑工程学院 ,北京 100083)
Author(s):
WANG Jianming CHEN Zhonghui ZHOU Zihan ZHANG Lingfan ZHANG Xuedong
(School of Mechanics and Civil Engineering, China University of Mining and TechnologyBeijing, Beijing 100083, China)
关键词:
岩质边坡裂缝扩展临界爆破药量应力强度因子
Keywords:
rock slope crack propagation critical blasting charge stress intensity factor
分类号:
X936;TD824
DOI:
10.11731/j.issn.1673-193x.2019.01.010
文献标志码:
A
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。
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.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期: 2018-11-21
基金项目: 国家重点研发计划课题(2016YFC0801602)
作者简介: 王建明,博士研究生,主要研究方向为边坡稳定性、地下采矿工程等。
更新日期/Last Update: 2019-01-31