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基于模型试验的重型动力触探杆长修正系数研究

左永振, 赵娜

左永振, 赵娜. 基于模型试验的重型动力触探杆长修正系数研究[J]. 岩土工程学报, 2016, 38(z2): 178-183. DOI: 10.11779/CJGE2016S2029
引用本文: 左永振, 赵娜. 基于模型试验的重型动力触探杆长修正系数研究[J]. 岩土工程学报, 2016, 38(z2): 178-183. DOI: 10.11779/CJGE2016S2029
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ZUO Yong-zhen, ZHAO Na. Model tests on modified coefficient of heavy dynamic penetration rod length[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(z2): 178-183. DOI: 10.11779/CJGE2016S2029
Citation: ZUO Yong-zhen, ZHAO Na. Model tests on modified coefficient of heavy dynamic penetration rod length[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(z2): 178-183. DOI: 10.11779/CJGE2016S2029
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基于模型试验的重型动力触探杆长修正系数研究  English Version

  • 长江科学院水利部岩土力学与工程重点实验室,湖北 武汉 430010

基金项目: 国家自然科学基金项目（51309024,51379021）
详细信息
    作者简介:

    左永振(1980- ),男,高级工程师,主要从事粗粒土力学性质研究。E-mail: zuoyongzh@163.com。

Model tests on modified coefficient of heavy dynamic penetration rod length

  • Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute,Wuhan 430010, China

摘要

    摘要
  • 摘要: 动力触探试验是西部地区河床覆盖层原位测试最常用的方法之一,其探测深度最大可达到上百米,在应用动力触探试验成果时,锤击数需要进行杆长修正,而目前岩土工程勘察规范中关于动力触探杆长修正问题,只给出了20 m范围内的杆长修正系数,深度超过20 m后的动力触探试验成果应该如何进行杆长修正,规范并无规定,规范已经不能满足生产需要,这也是限制该方法应用的关键问题。针对重型动力触探杆长修正问题,在室内进行不同杆长的重型动力触探模型试验,地基土材料为砂砾石和中粗砂两种,最大杆长达到83 m。通过模型试验,获得了重型动力触探杆长修正系数,重型动力触探杆长修正系数符合牛顿弹性碰撞理论,且与地基土材料特性和上覆压力无关。最后给出了推荐的重型动力触探杆长修正系数。
    Abstract: The dynamic penetration test (DPT) is one of widely applied in situ test techniques in bed covering of western region in China. The rod length during operation can be as long as hundreds of meters, and it should be modified in practical applications. On the modification of dynamic penetration rod length, the modified coefficient is proposed only in the range of 20 m in China's standard “Code for investigation of geotechnical engineering”,but how to modify has no provisions when the depth is more than 20 m. So the standard is unable to meet the production needs, and becomes a major issue that limits its applications. Indoor model tests are carried out for the modification issue, and heavy dynamic penetration model are conducted on sand and gravel soil with series of rod lengths (2.0 m, 8.9 m, 16.4 m, 23.4 m, 30.0 m, 36.0 m, 62.0 m, 83.0 m). The modification coefficient of heavy dynamic penetration rod length is obtained after the tests. It is analyzed and concluded that the modification of heavy dynamic penetration rod length obeys the description of Newton elastic collision theory, and is independent of the material properties and overburden pressure. Finally, the modified coefficient of dynamic penetration rod length is proposed.
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    • 参考文献(12)
  • [1] 左永振, 程展林, 丁红顺, 等. 动力触探杆长修正系数试验研究[J]. 岩土力学, 2014, 35(5): 1284-1288. (ZUO Yong-zhen, CHENG Zhan-lin, DING Hong-shun, et al. Study of modified coefficient of dynamic penetration rod length[J]. Rock and Soil Mechanics, 2014, 35(5): 1284-1288. (in Chinese))
    [2] 李会中, 郭 飞, 潘玉珍, 等. 重型超重型动力触探锤击数修正系数外延研究[J]. 人民长江, 2015, 46(1): 30-35. (LI Hui-zhong, GUO Fei, PAN Yu-zhen, et al. Study on extension and polynomial fitting of correction factors of heavy dynamic penetration and extra heavy dynamic penetration[J]. Yangtze River, 2015, 46(1): 30-35. (in Chinese))
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    [8] 龙达平, 姚永华. 深层标贯杆长修正问题的探讨[J]. 工程勘察, 1990, 3: 20-23. (LONG Da-ping,YAO Yong-hua. Discussion on the long correction of deep penetration rod length[J]. Engineering Investigation, 1990, 3: 20-23. (in Chinese))
    [9] JTJ064—98公路工程地质勘察规范[S]. 1999. (JTJ064—98 Specifications for survey of highway engineering geology[S]. 1999. (in Chinese))
    [10] 冯铭璋. 关于标准贯入试验杆长修正公式的讨论[J]. 工程勘察, 1986, 2: 15-16. (FENG Ming-zhang. Discussion on standard penetration test rod length correction formula[J]. Engineering Investigation, 1986, 2: 15-16. (in Chinese))
    [11] SKEMPTON A W. Standard penetration test procedures and the efforts in sands overburden pressure, relative density, particle size, ageing and over-consolidation[J]. Géotechnique, 1986, 36(3): 425-447.
    [12] ASTM D4633–86. Standard test method for stress wave energy measurement for dynamic penetrometer testing systems. Annual Book of Standards[S]. 1986.
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出版历程
  • 收稿日期:  2016-05-18
  • 发布日期:  2016-10-19

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