|Table of Contents|

Stability analysis of blasting excavation on high rock slope of reconstruction and extension highway(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年01期
Page:
112-122
Research Field:
基础工程
Publishing date:

Info

Title:
Stability analysis of blasting excavation on high rock slope of reconstruction and extension highway
Author(s):
FENG Zhongju1;  MENG Yingying1; 2;  HUO Jianwei1; 3;  ZHAO Ruixin1;  WANG Fuchun1;  JIANG Guan1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Henan Jiaoyuan Engineering Technology Group Co., Ltd, Zhengzhou 450046, Henan, China; 3. China State Construction International Investments Limited, Hangzhou 310000, Zhejiang, China)
Keywords:
slope engineering;  stability analysis;  numerical simulation;  high rock slope;  reconstruction and extension project;  millisecond blasting
PACS:
U416.1
DOI:
10.19815/j.jace.2021.07118
Abstract:
In order to study the influence of different blasting excavation methods on the stability of high rock slopes, relying on the reconstruction and expansion project of Beijing-Shanghai Expressway, the blasting load time history curve of high rock slopes was established. The dynamic response characteristics of the slope using simultaneous blasting and millisecond blasting methods were studied, and the safety factors of the two blasting methods and the change law of particle velocity were compared and analyzed. The results show that the method of calculating the equivalent blasting dynamic load with the modified blasting load constant B is reasonable and reliable to study the stability of the high rock slope under the action of blasting. The slope stability is high by using millisecond blasting, and the safety factor of the slope shows a decreasing periodic change with the application of the equivalent blasting dynamic load. When the equivalent blasting dynamic load F reaches the maximum value Fmax and 0.6Fmax, the corresponding safety factor is the minimum point. The velocity change of each particle changes synchronously with the application of the blasting dynamic load. As the distance between the particle and the blasting area increases, the law gradually weakens, and peak vibrations only appear near the maximum value. The velocity of each particle of simultaneous blasting is greater than that of millisecond blasting, which is not conducive to the excavation of the slope. The peak values between the measuring points appear decreasing and lagging. Stress concentration occurs near the blasting area. The local shear stress is greater than the shear strength of the rock mass. The use of millisecond blasting resulted in stress concentration near the blasting area, and the local shear stress is greater than the shear strength of rock mass, resulting in shear failure. The displacement monitoring difference before and after blasting is small, and good loosening effect is achieved. Local cracks appear in rock mass, so it is necessary to pay attention to timely support in the future.

References:

[1] 冯忠居,于 翔,冯 凯,等.公路加宽高边坡二次开挖落石防护风险评估[J].公路,2019,64(6):9-15.
FENG Zhongju,YU Xiang,FENG Kai,et al.Risk assessment of rockfall protective structures for secondary excavation of side slope for highway widening project[J].Highway,2019,64(6):9-15.
[2]冯忠居,霍建维,胡海波,等.高寒盐沼泽区干湿-冻融循环下桥梁桩基腐蚀损伤与承载特性[J].交通运输工程学报,2020,20(6):135-147.
FENG Zhongju,HUO Jianwei,HU Haibo,et al.Corrosion damage and bearing characteristics of bridge pile foundations under dry-wet-freeze-thaw cycles in alpine salt marsh areas[J].Journal of Traffic and Transportation Engineering,2020,20(6):135-147.
[3]冯忠居,于 翔,高雪池,等.公路路基边坡失稳风险及处治效果评价研究[J].公路,2020,65(9):1-8.
FENG Zhongju,YU Xiang,GAO Xuechi,et al.Evaluation and study of the instability risk and treatment effect of roadbed slope[J].Highway,2020,65(9):1-8.
[4]MAO L J,XU Q,JIAN Z,et al.Dynamic responses of slope under the effect of seismic loads[J].Applied Mechanics and Materials,2013,438/439:1587-1591.
[5]范 哲.不同风化程度凝灰岩高边坡破坏机理及加固技术研究[D].西安:长安大学,2018.
FAN Zhe.Research on failure mechanism and reinforcement technology of tuff high slope with different degree of weathering[D].Xi'an:Chang'an University,2018.
[6]冯云鹤.加宽高速公路既有高边坡二次开挖稳定性分析及工程技术研究[D].西安:长安大学,2016.
FENG Yunhe.The secondary excavation stability analysis of the existing high slope and engineering technology research in the highway reconstruction project[D].Xi'an:Chang'an University,2016.
[7]冯忠居,朱彦名,高雪池,等.基于熵权-灰关联法的岩质开挖边坡安全评价模型[J].交通运输工程学报,2020,20(2):55-65.
FENG Zhongju,ZHU Yanming,GAO Xuechi,et al.Safety evaluation model of excavating rock slope based on entropy-grey correlation method[J].Journal of Traffic and Transportation Engineering,2020,20(2):55-65.
[8]冯忠居,张永清,李 晋.堆载引起桥梁墩台与基础的偏移及防治技术研究[J].中国公路学报,2004,17(3):74-77.
FENG Zhongju,ZHANG Yongqing,LI Jin.Study of displacement of bridge pier and abutment foundation caused by earth piling load and its prevention technique[J].China Journal of Highway and Transport,2004,17(3):74-77.
[9]蒙超荣,冯忠居,胡明华,等.边坡人字形骨架防护骨架尖角设计研究[J].公路,2017,62(5):53-58.
MEMG Chaorong,FENG Zhongju,HU Minghua,et al.Study of design for herringbone skeleton sharp angle of side slope protection[J].Highway,2017,62(5):53-58.
[10]高文学,刘运通.路堑高边坡岩体多边界爆破理论及其应用[J].岩石力学与工程学报,2007,26(增1):3397-3401.
GAO Wenxue,LIU Yuntong.Blasting theory of high and steep road cutting rock slope with multilateral boundary and its application[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(S1):3397-3401.
[11]任永强,张家铭,李 晔,等.基于数值模拟技术的爆破动力荷载对边坡的稳定性影响研究[J].自然灾害学报,2013,22(5):262-268.
REN Yongqiang,ZHANG Jiaming,LI Ye,et al.Study into influence of blasting dynamic load on slope stability based on numerical simulation[J].Journal of Natural Disasters,2013,22(5):262-268.
[12]史秀志,陈 新,史采星,等.基于GEP的爆破峰值速度预测模型[J].振动与冲击,2015,34(10):95-99.
SHI Xiuzhi,CHEN Xin,SHI Caixing,et al.Prediction model for blasting-vibration-peak-speed based on GEP[J].Journal of Vibration and Shock,2015,34(10):95-99.
[13]刘 斌,葛大庆,李 曼,等.地基InSAR评估爆破作业对露天采矿边坡的稳定性影响[J].遥感学报,2018,22(增1):139-145.
LIU Bin,GE Daqing,LI Man,et al.Using ground-based InSAR to evaluate the stability of an open-pit slope under blasting operation[J].Journal of Remote Sensing,2018,22(S1):139-145.
[14]YUAN W,LIU S G,WANG W,et al.Numerical study on the fracturing mechanism of shock wave interactions between two adjacent blast holes in deep rock blasting[J].Earthquake Engineering and Engineering Vibration,2019,18(4):735-746.
[15]刘小鸣,陈士海.群孔微差爆破的地表振动波形预测及其效应分析[J].岩土工程学报,2020,42(3):551-560.
LIU Xiaoming,CHEN Shihai.Prediction and effect analysis of surface vibration waveform for group hole delay blasting[J].Chinese Journal of Geotechnical Engineering,2020,42(3):551-560.
[16]冷振东,卢文波,胡浩然,等.爆生自由面对边坡微差爆破诱发振动峰值的影响[J].岩石力学与工程学报,2016,35(9):1815-1822.
LENG Zhendong,LU Wenbo,HU Haoran,et al.Studies on influence of blast-created free face on ground vibration in slope blasts with millisecond-delays[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(9):1815-1822.
[17]杨仁树,丁晨曦,杨国梁,等.微差爆破的爆生裂纹扩展特性试验研究[J].振动与冲击,2017,36(24):97-102.
YANG Renshu,DING Chenxi,YANG Guoliang,et al.Tests for blasting induced crack propagation characteristics of short-delay blasting[J].Journal of Vibration and Shock,2017,36(24):97-102.
[18]爆破安全规程:GB 6722—2014[S].北京:中国标准出版社,2015.
Safety regulations for blasting:GB 6722—2014[S].Beijing:Standards Press of China,2015.
[19]YANG C L,CAO G W,YANG X Z.Uniform formula for the Riemann solutions of a scalar combustion model[J].Acta Mathematica Scientia,2016,36(5):1405-1418.
[20]SCHALL J,THOMPSON P L,ZERGES S M,et al.Hydraulic design of highway culverts,third edition[R].Washington DC:Federal Highway Administration,2012.
[21]邹新宽.浅埋连拱隧道开挖爆破动力响应特征及减振技术研究[D].成都:西南交通大学,2016.
ZOU Xinkuan.Blasting dynamic response characteristics and vibration reduction technology in shallow-buried arch-tunnel[D].Chengdu:Southwest Jiaotong University,2016.
[22]国家安全生产监督管理总局,国家煤矿安全监察局.煤矿安全规程2016[M].北京:煤炭工业出版社,2016.
State Administration of Work Safety,National Mine Safety Administration.Coal mine safety regulations 2016[M].Beijing:China Coal Industry Publishing House,2016.
[23]郑颖人.岩土数值极限分析方法的发展与应用[J].岩石力学与工程学报,2012,31(7):1297-1316.
ZHENG Yingren.Development and application of numerical limit analysis for geological materials[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(7):1297-1316.
[24]陈 明,卢文波,吴 亮,等.小湾水电站岩石高边坡爆破振动速度安全阈值研究[J].岩石力学与工程学报,2007,26(1):51-56.
CHEN Ming,LU Wenbo,WU Liang,et al.Safety threshold of blasting vibration velocity to high rock slope of Xiaowan hydropower station[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(1):51-56.
[25]蒋 楠,周传波,平 雯,等.岩质边坡爆破振动速度高程效应[J].中南大学学报(自然科学版),2014,45(1):237-243.
JIANG Nan,ZHOU Chuanbo,PING Wen,et al.Altitude effect of blasting vibration velocity in rock slopes[J].Journal of Central South University(Science and Technology),2014,45(1):237-243.
[26]黄润秋.岩石高边坡发育的动力过程及其稳定性控制[J].岩石力学与工程学报,2008,27(8):1525-1544.
HUANG Runqiu.Geodynamical process and stability control of high rock slope development[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(8):1525-1544.

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Last Update: 2023-01-01