中文摘要：

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、36．0m。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。

英文摘要：

Dynamic penetration is one of wide applied in-situ test techniques. The rod length during operation could be as long as hundreds of meters, calling for length modification in practical applications. Two major methods are proposed in most present specifications for the modification of dynamic penetration rod length. These two methods are founded differently on Newton elastic collision theory and elastic rod waving theory, and derived totally different modified coefficients. How to apply rod length modifications to the results of dynamic penetration test has currently become major issues that limit their application. Indoor model tests are put forward for the modification issues, altogether with varies of heavy dynamic penetration model being conducted on sand and gravel soil with series of rod lengths （2.0, 8.9, 16.4, 23.4, 30.0, 36.0 m）. The modification coefficient of heavy dynamic penetration rod length is obtained after the tests. It is analyzed and concluded that the modification to heavy dynamic penetration rod length followed the description of Newton elastic collision theory, and is independent of the material properties.