高速公路既有线扩堑爆破对边坡岩体损伤及稳定性研究
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摘要
针对高速公路扩堑爆破中复杂的现场环境和施工条件下引起公路边坡安全隐患,利用现场爆破振动监测和数值模拟的方法,研究广西南宁某高速公路段的改扩建工程中爆破振动对既有线边坡岩体损伤的影响。监测和数值模拟结果的分析和研究表明:依据工程实例构建的爆破数值模型计算结果和实际监测结果较吻合,可以用来分析和研究爆破振动对岩体损伤及稳定性影响;模型同一位置在不同爆破条件下,同时起爆相对于微差起爆爆破振动合速度增加了52%～105.4%,单段最大药量是爆破振动速度的最主要因素;微差起爆条件下,岩体中的有效应力相对于同时起爆降低了51.4%～98.2%,增加了载荷的作用次数。因此,在微差爆破条件下要防止边坡岩体在频繁载荷作用下的损伤。
In view of the potential safety hazards of highway slope caused by the complex site environment and construction conditions of highway cutting blasting,the influence of blasting vibration on rock mass damage and stability of existing highway slope in a highway reconstruction and extension project in Nanning,Guangxi,was studied by means of on-site blasting vibration monitoring and numerical simulation.According to the monitoring and numerical simulation results,the numerical model of blasting based on engineering examples fits the actual monitoring results well,which can be used to study the impact of blasting vibration on rock mass damage and stability.The combined velocity of blasting vibration increases by 52%～105.4% compared with millisecond initiation at the same position of the model under different blasting conditions.Under the condition of millisecond initiation,the effective stress in rock mass decreases by 51.4%～98.2% compared with the simultaneous initiation,but the times of load gets increased.Therefore,under the condition of millisecond blasting,the damage of slope rock mass under frequent loads should be prevented.
In view of the potential safety hazards of highway slope caused by the complex site environment and construction conditions of highway cutting blasting,the influence of blasting vibration on rock mass damage and stability of existing highway slope in a highway reconstruction and extension project in Nanning,Guangxi,was studied by means of on-site blasting vibration monitoring and numerical simulation.According to the monitoring and numerical simulation results,the numerical model of blasting based on engineering examples fits the actual monitoring results well,which can be used to study the impact of blasting vibration on rock mass damage and stability.The combined velocity of blasting vibration increases by 52%～105.4% compared with millisecond initiation at the same position of the model under different blasting conditions.Under the condition of millisecond initiation,the effective stress in rock mass decreases by 51.4%～98.2% compared with the simultaneous initiation,but the times of load gets increased.Therefore,under the condition of millisecond blasting,the damage of slope rock mass under frequent loads should be prevented.
引文
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[2] 徐树焕,刘静.公路岩质边坡爆破稳定性数值模拟分析研究[J].公路交通科技(应用技术版),2015,11(12):94-96.[2] XU Shu-huan,LIU Jing.Numerical simulation analysis of blasting stability of highway rock slope[J].Journal of Highway and Transportation Technology (Application Technology Edition),2015,11(12):94-96.(in Chinese)
[3] 张云鹏,武旭,郭奇峰.振动频率对台阶地形岩体内振动波地形效应影响的研究[J].矿业研究与开发,2018,38(7):71-76.[3] ZHANG Yun-peng,WU Xu,GUO Qi-feng.Study on the influence of vibration frequency on terrain effect of seismic wave in the rock mass with step topography[J].Mining Research and Development,2018,38(7):71-76.(in Chinese)
[4] 方超杰.公路路基爆破工程施工技术探讨[J].西部交通科技,2018(7):43- 45.[4] FANG Chao-jie.Discussion on construction technology of highway subgrade blasting engineering[J].Western Transportation Science & Technology,2018(7):43- 45.(in Chinese)
[5] 丁林敏,陶雪芬,吴著明.复杂环境下高速公路半坡开挖控制爆破[J].矿业研究与开发,2018,38(9):100-103.[5] DING Lin-min,TAO Xue-fen,WU Zhuo-ming.Controlled blasting in half slope excavation of a highway under complicated surroundings[J].Mining Research and Development,2018,38(9):100-103.(in Chinese)
[6] 吕凯.浅谈公路路基石方爆破施工技术[J].西部交通科技,2018(9):36-39,49.[6] Lü Kai.Discussions on stone blasting construction technology of highway subgrade[J].Western Transportation Science & Technology,2018(9):36-39,49.(in Chinese)
[7] 陈宁宁,高文学,周世生,等.爆炸荷载作用下路堑边坡稳定性分析[J].施工技术,2013,42(13):64- 67.[7] CHEN Ning-ning,GAO Wen-xue,ZHOU Sheng-sheng,et al.Study on stability of cutting slope under blast load[J].Construction Technology,2013,42 (13):64- 67.(in Chinese)
[8] 高文学,刘宏宇,刘洪洋,等.爆破开挖对路堑高边坡稳定性影响分析[J].岩石力学与工程学报,2010,29(S1):2982-2987.[8] GAO Wen-xue,LIU Hong-yu,LIU Hong-yang,et al.Analysis of the influence of blasting excavation on the stability of high cutting slope[J].Chinese Journal of Rock Mechanics and Engineering,2010,29 (S1):2982-2987.(in Chinese)
[9] 邹锐,王玉杰,任少峰,等.含水土质边坡的爆破振动响应及破坏模式研究[J].爆破,2018,35(1):27-34.[9] ZOU Rui,WANG Yu-jie,REN Shao-feng,et al.Study on vibration response and failure mode of soil slope with groundwater[J].Blasting,2018,35(1):27-34.(in Chinese)
[10] 李继业,蒲朝钦,何兴贵.节理岩体边坡爆破振动衰减特征分析[J].爆破,2018,35(2):32-36.[10] LI Ji-ye,PU Chao-qin,HE Xing-gui.Analysis of blasting vibration attenuation characteristics of jointed rock mass slope[J].Blasting,2018,35(2):32-36.(in Chinese)
[11] 赵亮,王旭东,裴强强,等.G7公路甘肃段爆破施工对土遗址震动影响的检测与分析[J].地震工程学报,2017,39(2):343-347,355.[11] ZHAO Liang,WANG Xu-dong,YAN Qiang-qiang,et al.Detection and analysis of the influence of blasting construction on the earthquake site of Gansu section of G7 highway[J].Journal of Earthquake Engineering,2017,39(2):343- 347,355.(in Chinese)
[12] 杨立云,刘振坤,周莹莹,等.爆炸应力波在含层理介质中传播规律的实验研究[J].爆破,2018,35(2):1-5.[12] YANG Li-yun,LIU Zhen-kun,ZHOU Ying-ying,et al.Study on propagation law of explosive stress wave in layered media[J].Blasting,2018,35(2):1-5.(in Chinese)
[13] 王玲霞.公路隧道爆破振动波的传播规律研究[J].公路,2018,63(5):332-336.[13] WANG Ling-xia.Research on propagation law of blasting vibration wave in highway tunnel[J].Highway,2018,63(5):332-336.(in Chinese)
[14] 罗志光,张长亮,陈力华,等.公路隧道不耦合装药光面爆破现场试验[J].地下空间与工程学报,2017,13(S2):578-584.[14] LUO Zhi-guang,ZHANG Chang-liang,CHEN Li-hua,et al.Field trial of uncoupled charge smooth blasting for highway tunnel[J].Chinese Journal of Underground Space and Engineering,2017,13(S2):578-584.(in Chinese)