重型动力触探轴向冲击力与锤击能试验研究

doi:10.13722/j.cnki.jrme.2015.0183

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摘要动力触探试验杆长修正系数取值的合理性，依赖于对探杆受到落锤撞击后探杆内轴向冲击力及锤击能传递规律的认识程度。设计4个杆长方案(22.92，25.87，40.92，46.85 m)，在武汉南湖窑沟村、阳逻堤防2个场地开展重型动力触探试验，通过动态应变仪采集到各测点(沿探杆轴向布置6个测点)的全时程应变；然后，计算出各测点全过程的轴向冲击力，并应用F2法得到了各测点的锤击能；最后，研究各测点的轴向冲击力、锤击能的时空分布规律，并建立探杆轴向冲击力、锤击能与杆长的关系式，结果表明，杆顶的锤击能与已有的研究结果一致。研究成果可为杆长超过21 m的动力触探试验推广应用提供参考依据。

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关键词 ：土力学, 杆长修正, 轴向冲击力, 锤击能, 重型动力触探

Abstract：The correcting coefficient for rod length in dynamic penetration test depends on the transmission of the axial impacting force and the impacting energy of hammer from the top to the bottom end of the rod after the hammer impacted the rod top. Four test schemes with the rod lengths of 22.92，25.87，40.92 and 46.85 m respectively were designed and six monitored points were arranged along the axis of the rod. The heavy dynamic penetration tests were carried out at two sites in Wuhan，one at Yaogou village near South Lake and another at the cofferdam in Yangluo. The whole strain processes of every monitored point were measured with the dynamic strain gauge. Subsequently，the axial impacting force of the every monitored point was calculated and the hammer impacting energy was obtained with F2 method based on the wave mechanics. The temporal and spatial distributions of the axial impacting force and the impacting energy of hammer along the rod were studied thoroughly. The formulations of the axial impacting force and the hammer impacting energy with the rod length were established，which were consistent with existing research results.

Key words： soil mechanics correction coefficient of rod length axial impacting force hammer impacting energy heavy dynamic penetration test

引用本文:

石磊1，傅少君1，袁稳沉1，韩燕华1，2，赵明杰1. 重型动力触探轴向冲击力与锤击能试验研究[J]. 岩石力学与工程学报, 2016, 35(1): 201-208.
SHI Lei1，FU Shaojun1，YUAN Wenchen1，HAN Yanhua1，2，ZHAO Mingjie1. Experimental study on axial impacting force and hammer impacting energy in rod of heavy dynamic penetration test. , 2016, 35(1): 201-208.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2015.0183 或 http://www.rockmech.org/CN/Y2016/V35/I1/201

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