爆破振动对新浇混凝土影响的试验研究

吴帅峰1,王戈2,袁东凯1,刘殿书1

振动与冲击 ›› 2017, Vol. 36 ›› Issue (2) : 39-44.

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (2) : 39-44.
论文

爆破振动对新浇混凝土影响的试验研究

  • 吴帅峰1,王戈2,袁东凯1,刘殿书1
作者信息 +

Experimental study on the influence of blasting vibration on fresh concrete

  • WU Shuaifeng1,WANG Ge2,YUAN Dongkai1,LIU Dianshu1
Author information +
文章历史 +

摘要

为探究新浇混凝土受爆破振动作用下的安全振速,以保证混凝土结构的可靠性,采用露天深孔爆破作为振源,对龄期为6h、12h、36h、48h和72h的C40混凝土分别在2~10cm/s的爆破振速下进行试验。通过测试各龄期试件在受振动扰动后的纵波波速及抗压强度,分析得出:龄期为6h和12h时,2.3cm/s的爆破振速能够使混凝土产生大于0.05的损伤以及5%以上的强度折减;龄期为36h和48h时,能够对混凝土造成损伤和强度折减的振速为4cm/s,36h龄期为混凝土抗振能力提升的拐点;龄期为72h时,混凝土表现出明显的抗振性能。最后,以损伤不大于0.05和强度折减不大于5%双重指标,给出龄期为6h、12h、36h、48h和72h的混凝土安全振速分别为2cm/s、2cm/s、4cm/s、5cm/s、7cm/s。为完善新浇混凝土在爆破振动下的安全标准提供参考。

Abstract

In order to inspect the safety vibration velocity of fresh concrete under blasting vibration,and ensure the reliability of concrete structure,open-pit longhole blasting was used as a vibration source to test the C40 concrete at the vibration velocity of 2-10 cm/s and the age of 6h,12h,36h,48h and 72h. The following results were obtained by testing the longitudinal wave velocity and compressive strength of specimens at various ages under vibration effect: at the age of 6h and 12h,2.3 cm/s of blasting vibration velocity may cause damage degree greater than 0.05 and strength reduction greater than 5%;at the age of 36h,48h and 72h,the vibration velocity which can cause damage and strength reduction of concrete is 4 cm/s,and the age of 36h is the inflection point of raising the anti-vibration ability of concrete;at the age of 72h,the concrete shows proper anti-vibration performance obviously. Finally,with the double index of damage degree no greater than 0.05 and strength reduction no greater than 5%,the safety vibration velocities of concrete at the age of 6h,12h,36h,48h and 72h were determined: 2 cm/s,2 cm/s,4 cm/s,5 cm/s and 7 cm/s,respectively. The results provide reference for improving safety standards of concrete under blasting vibration.

关键词

新浇混凝土 / 爆破振动 / 混凝土龄期 / 安全振速

Key words

fresh concrete / blasting vibration / concrete age / safety vibration velocity

引用本文

导出引用
吴帅峰1,王戈2,袁东凯1,刘殿书1. 爆破振动对新浇混凝土影响的试验研究[J]. 振动与冲击, 2017, 36(2): 39-44
WU Shuaifeng1,WANG Ge2,YUAN Dongkai1,LIU Dianshu1. Experimental study on the influence of blasting vibration on fresh concrete[J]. Journal of Vibration and Shock, 2017, 36(2): 39-44

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