[1]张祎,李恒,王林峰,等.爆破作用下危岩稳定的可靠度分析[J].地震工程与工程振动,2021,41(03):210-219.[doi:10.13197/j.eeev.2021.03.210.zhangy.021]
 ZHANG Yi,LI Heng,WANG Linfeng,et al.Stability and reliability analysis of dangerous rocks under blasting[J].EARTHQUAKE ENGINEERING AND ENGINEERING DYNAMICS,2021,41(03):210-219.[doi:10.13197/j.eeev.2021.03.210.zhangy.021]
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爆破作用下危岩稳定的可靠度分析
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《地震工程与工程振动》[ISSN:/CN:]

卷:
41
期数:
2021年03
页码:
210-219
栏目:
论文
出版日期:
2021-06-30

文章信息/Info

Title:
Stability and reliability analysis of dangerous rocks under blasting
作者:
张祎12 李恒12 王林峰3 曾韬睿3
1. 中国地震局地震研究所 地震预警湖北省重点实验室, 湖北 武汉 430071;
2. 武汉地震工程研究院有限公司, 湖北 武汉 430071;
3. 重庆交通大学 山区公路水运交通地质减灾重庆市高校市级重点实验室, 重庆 400074
Author(s):
ZHANG Yi12 LI Heng12 WANG Linfeng3 ZENG Taorui3
1. Hubei Key Laboratory of Earthquake Early Warning, Institute of Seismology, CEA, Wuhan 430071, China;
2. Wuhan Institute of Earthquake Engineering Co., Ltd., Wuhan 430071, China;
3. Key Laboratory of Geological Hazards Mitigation for Mountainous Highway and Waterway, Chongqing Municipal Education Commission Chongqing Jiaotong University, Chongqing Jiaotong University, Chongqing 400074, China
关键词:
危岩爆破可靠度稳定性敏感性分析
Keywords:
dangerous rockblastingreliabilitystabilitysensitivity analysis
分类号:
P642
DOI:
10.13197/j.eeev.2021.03.210.zhangy.021
摘要:
为进行爆破作用下危岩稳定性的可靠度分析,基于可靠度理论和极限平衡方程,建立了考虑爆破力作用下的滑移式危岩、坠落式危岩和倾倒式危岩的功能函数、可靠指标和失稳概率计算方法。以天生三桥爆破施工为例,计算结果表明,受到爆破作用后离爆破点较近的危岩处于欠稳定~不稳定状态,离爆破点较远的危岩处于稳定~基本稳定状态,滑移式、坠落式和倾倒式危岩在受到爆破作用后失稳概率分别提高了20.78%、14.91%和5.8%。总结分析不同因素对爆破作用下危岩失稳概率的影响可知,粘聚力降低使坠落式危岩更易发生破坏;摩擦角变化对滑移式危岩失稳概率影响更显著;危岩和基座抗拉强度变化对重心在倾覆点外侧的危岩影响更大;炸药量和爆心距变化对坠落式危岩影响最大,倾倒式危岩次之,滑移式危岩最小。
Abstract:
According to the failure modes, dangerous rocks can be divided into sliding, falling and toppling types. Based on the reliability theory and the limit equilibrium equation, the calculation expressions of the function, reliable index and failure probability are obtained. Taking the blasting construction of Tiansheng 3rd Bridge as an example, the calculation results show that dangerous rocks closer to the blasting point are more unstable, those far from the blasting point are in stable or basic stable state. The failure probability of sliding type, falling type and toppling type increases 20.78%, 14.91%, and 5.8% under blasting, respectively. Analyzing the impacts of different factors on the failure probability, the decrease of cohesion force(c) makes the falling type more likely to be destroyed. The change of friction angle(φ) has greater impact on sliding dangerous rocks. Toppling type outside the tipping point is more sensitive to tensile strength of rocks and foundation beds. The changes of explosive mass and distance to the blasting center have the greatest impacts on falling dangerous rocks, followed by toppling and sliding ones.

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备注/Memo

备注/Memo:
收稿日期:2020-06-01;改回日期:2020-10-21。
基金项目:国家重点研发计划项目(2016YFC0802203);国家自然科学基金项目(51678097)
作者简介:张祎(1984-),男,工程师,硕士,主要从事岩土工程及地震地质灾害防治研究.E-mail:yzhang.wh@foxmail.com
更新日期/Last Update: 1900-01-01