动力触探杆长修正系数试验研究

发布时间：2018-09-10 10:26

【摘要】：动力触探是一种应用广泛的原位测试技术,其动探杆长最大可达到上百米,在实际应用中需要进行杆长修正,目前规范中关于动力触探杆长修正问题,给出了以牛顿弹性碰撞理论和弹性杆波动理论为基础的两种修正方法,依据两种理论得出的修正系数是截然不同的。动力触探试验成果应该如何进行杆长修正,是限制该方法应用的重大问题。针对动力触探杆长修正问题,提出了室内模型试验,并依据砂砾石和均质砂两种地基土进行不同杆长的重型动力触探模型试验,杆长分别为2.0、8.9、16.4、23.4、30.0、36.0 m。通过试验,得到重型动力触探杆长修正系数。分析认为,重型动力触探杆长修正规律符合牛顿弹性碰撞理论,且与地基土材料特性无关。
[Abstract]:Dynamic penetration detection is a widely used in situ testing technology, the maximum length of the dynamic probe rod can be up to hundreds of meters, in practical application, the length of the rod should be revised. The problem of the correction of the length of the dynamic sounding rod in the current code is concerned. Two correction methods based on Newtonian elastic collision theory and elastic rod wave theory are presented. The correction coefficients obtained from the two theories are quite different. It is an important problem to limit the application of the method how to modify the length of rod in the test results of dynamic penetration test. Aiming at the problem of modifying the length of dynamic sounding rod, an indoor model test is put forward. According to the sand gravel and homogeneous sand soil, the heavy-duty dynamic penetration model test with different length of rod is carried out. The length of the rod is 2.0 ~ 8.9 ~ 16.44.30.036.0m. Through the experiment, the correction coefficient of the length of the heavy power penetration rod is obtained. It is considered that the correction law of the length of the heavy-duty dynamic sounding rod accords with Newton's elastic collision theory and has nothing to do with the properties of soil and foundation materials.
【作者单位】：长江科学院水利部岩土力学与工程重点实验室;
【基金】：中央级公益性科研院所基本科研业务费(CKSF2012022/YT) 国家自然科学青年基金(51309024) 水利部公益性行业科研专项经费项目(201201039)
【分类号】：TU413

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