深基坑开挖爆破对桩锚支护结构的影响及其机理研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (22) : 144-150.

论文

孙鹏昌1,2，覃卫民2，陈明1，卢文波1

作者信息 +

Influence of blasting in deep excavations on anchored pile supporting structures and its mechanism

SUN Pengchang1,2,QIN Weimin2,CHEN Ming1,LU Wenbo1

Author information +

文章历史 +

摘要

研究深基坑开挖爆破对桩锚支护结构的影响是确保深基坑安全稳定的关键性问题。依托厦门机场路一期工程分离式车行隧道深基坑爆破开挖工程，基于现场爆破振动监测数据建立了桩锚支护深基坑Abaqus三维有限元数值计算模型，分析研究了深基坑开挖爆破作用下，桩锚支护结构的爆破振动响应规律，支护桩的塑性损伤分布以及预应力锚索的拉力变化规律。研究结果表明：紧邻爆区的桩身最大爆破振动速度超过30 cm/s，远大于可参照的爆破振动安全控制标准，桩顶爆破振动存在放大效应；预应力锚索不同位置处的爆破振动速度远小于桩身，且与爆心距无明显相关性；爆破加载作用在波阻抗较小的岩土体边界上，易使支护桩与岩土体的交界面产生受拉损伤；爆破加载使得不同排预应力锚索的拉力产生重新分配调整。结合结构动力学和波动力学理论简要分析了深基坑开挖爆破对桩锚支护结构影响的作用机理。研究结果可为桩锚支护深基坑开挖爆破设计提供参考。

Abstract

Studying the influences and mechanisms of blasting on anchored pile supporting structures is a key issue to ensure the safety and stability of deep excavations. Relying on the deep excavations of Xiamen Airport Road Phase I, the Abaqus finite element model of the deep excavations was established. The blast vibration of the anchored pile supporting structures, the plastic damage distribution of the supporting piles, and variation of pulling force in prestressed cables were studied. The results show that the maximum blast vibration of the pile body in the adjacent blasting area is much greater than the referred blast vibration safety control standards, and there is an amplification effect of the blast vibration at the top of the pile. The blast vibration at different positions of the prestressed anchor cables is much smaller than that of the pile body, and there is no obvious correlation with the distance from explosive source. It is easy to cause tensile damage to the interface between the rock and the supporting pile if the wave impedance of the rock is rather small. The blast loading causes the readjustment and distribution of the tensile force of the prestressed anchor cables. Based on structural dynamics and wave dynamics theory, the influence mechanisms of blasting on anchored pile supporting structures were analyzed.

导出引用

孙鹏昌1,2，覃卫民2，陈明1，卢文波1. 深基坑开挖爆破对桩锚支护结构的影响及其机理研究[J]. 振动与冲击, 2021, 40(22): 144-150

SUN Pengchang1,2,QIN Weimin2,CHEN Ming1,LU Wenbo1. Influence of blasting in deep excavations on anchored pile supporting structures and its mechanism[J]. Journal of Vibration and Shock, 2021, 40(22): 144-150

参考文献

[1] 李宁, 张西前, 于冲. 爆破应力波对边坡预应力锚索的动力影响[J]. 岩石力学与工程学报, 2007, 26(S1): 2593-2600.
LI Ning, ZHNAG Xi-qian, Yu Chong. Research on dynamic response of prestressed anchor cables subjected to blasting load on slope[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(S1): 2593-2600.
[2] 陆遐龄. 岩石高边坡爆破开挖对锚固设施的影响[J]. 爆破, 2000, 17(S1): 147-151.
LU Xia-ling. Influence of rock high slope explosive excavation on anchored installations[J]. Blasting, 2000, 17(S1): 147-151.
[3] 苏华友, 张继春. 紫坪铺进水口高陡边坡锚索抗爆破振动分析[J]. 岩石力学与工程学报, 2003, 22(11): 1916-1918.
SU Hua-you, ZHANG Ji-chun. Analysis on blasting vibration effect on prstressed cable of high slope in zipingpu project[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(11): 1916-1918.
[4] 吴忠诚, 汤连生, 刘晓纲, 等. 复合土钉墙大型现场测试及变形性状分析研究[J]. 岩石力学与工程学报, 2007, 26(z1): 2974-2980.
WU Zhong-cheng, TANG Lian-sheng, LIU Xiao-gang, et al. Study on large-scale in-situ test on compound soil nailing wall and deformation property analysis[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(z1): 2974-2980.
[5] 贾永胜, 钟冬望, 姚颖康, 等. 基坑爆破预留层对围护桩的保护作用数值分析[J]. 工程爆破, 2017, 23(05): 4-7+24.
JIA Yong-sheng, ZHONG Dong-wang, YAO Ying-kang, et al. Numerical calculation of the barrier effect of the pre-protective layer on bored piles in deep foundation pit blasting[J]. Engineering Blasting, 2017, 23(05): 4-7+24.
[6] 刘燕, 陶津, 文永胜, 等. 爆破作用下桩锚支护结构设计探讨[J]. 青岛理工大学学报, 2005, 26(6): 46-48.
LIU Yan, TAO Jin, WEN Yong-sheng, et al. The discussion of the design for pit-anchor supporting structure under the action of blast[J]. Journal Of Qingdao Technological University, 2005, 26(6): 46-48.
[7] 曲宏略, 胡焕国, 张建经,等. 地震动对锚索桩的响应特性研究[J]. 地震工程学报, 2015, 37(2): 317-323.
QU Hong-lve, HU Huan-guo, ZHANG Jian-jing, et al. Dynamic response characteristics of anchor cable piles under ground motion[J]. China Earthquake Engineering Journal, 2015, 37(2): 317-323.
[8] 曲宏略, 张建经, 王富江. 预应力锚索桩板墙地震响应的振动台试验研究[J]. 岩土工程学报, 2013, 35(2): 313-320.
QU Hong-lve, ZHANG Jian-jing, WANG Fu-jiang. Seismic response of prestressed anchor sheet pile wall from shaking table tests[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(2): 313-320.
[9] 康景文, 颜光辉, 胡静, 等. 深基坑锚拉支护结构地震时程分析及静动对比研究[J]. 岩土工程学报, 2010, 32(S2): 183-186.
KANG Jing-wen, YAN Guang-hui, HU Jing, et al. Seismic time history analysis and static-dynamic comparative study on anchored supporting structure of deep foundation pit[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(S2): 183-186.
[10] 范刚, 张建经, 付晓, 等. 双排桩加预应力锚索加固边坡锚索轴力地震响应特性研究[J]. 岩土工程学报, 2016, 38(6): 1095-1103.
FAN Gang, ZHANG Jian-jing, FU Xiao, et al. Axial force of anchor cables in slope reinforced by double-row anti-slide piles and pre-stressed anchor cables[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(6): 1095-1103.
[11] LEE, J, FENVES, G L. A plastic-damage concrete model for earthquake analysis of dams[J]. Earthquake Engineering & Structural Dynamics, 1998, 27(9): 937-956.
[12] LU W, YANG J, CHEN M, et al. An equivalent method for blasting vibration simulation[J]. Simulation Modelling Practice & Theory, 2011, 19(9): 2050-2062.
[13] 覃卫民, 逄铁铮, 王浩, 等. 深基坑附近房屋出现裂缝的施工监测分析[J]. 岩石力学与工程学报, 2009, 28(3): 533-540.
QIN Wei-min, PANG Tie-zheng, WANG Hao, et al. Analysis of excavation monitoring for house cracking nearby deep pit foundation[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(3): 533-540.
[14] GB 6722-2014. 爆破安全规程[S]. 北京: 中国标准出版社, 2015.
GB 6722-2014. Safety regulations for blasting[S]. Beijing: Standards Press of China, 2015.
[15] DL/T 5135-2013. 水电水利工程爆破施工技术规范[S]. 北京: 中国电力出版社, 2014.
DL/T 5135-2013. Specification of excavation blasting for hydropower and water resources projects[S]. Beijing: China Electric Power Press, 2014.
[16] Dowding C H. Construction Vibrations[M]. Eaglewood Cliffs: Prentice Hall Inc., 2008.
[17] Achenbach J D, Hemann J H, Ziegler F. Tensile failure of interface bonds in a composite body subjected to compressive loads[J]. Aiaa Journal, 1968, 6(10): 2040-2043.