圆锥动力触探成果在碎石土勘察中应用.pdfVIP

第3卷 第7期 542 中国科技论文在线 SCIENCEPAPER ONLINE 2008 年 7 月 圆锥动力触探成果在碎石土勘察中的应用 李奇峰 1,2 ，梁收运 1 （1. 兰州大学土木工程与力学学院，兰州 730000 ；2. 甘肃煤田地质局一四六队，甘肃平凉 744000 ） 摘 要：重型及超重型圆锥动力触探试验是碎石土地基勘察的有效手段，但在通常勘察中，人们常仅把圆锥动 力触探成果作为地基土求取参数的定性参考数值，有时即便用圆锥动力触探数值在规范表格中查得地基承载力 及变形参数，却因数值远大于实际数值，而不得不弃用。本文从圆锥动力触探的原理、应用入手，以工程实例 分析动力触探数值常常偏大的原因及处理办法，实现动力触探成果与地基土力学参数之间合理的转换关系，以 推进对圆锥动力触探试验在岩土工程勘察中更好、更准确地应用。 关键词：勘查技术；圆锥动力触探；试验研究；碎石土；锤击数；应用技巧 中图分类号：TU19 文献标识码：A 文章编号：1673－7180(2008)07 －0542 －5 The application of cone dynamic penetration test method to geotechnical exploration in gravel soils LI Qifeng1,2, LIANG Shouyun1 (1. College of Civil Engineering and Mechanics ，Lanzhou University ，Lanzhou 730000; 2. No.146 Team of Gansu Coal Geological Bureau ，Pingliang ，Gansu 744000) Abstract: The heavy and super-heavy cone dynamic penetration test is an effective means to geotechnical exploration in gravel soils. But the results of cone penetration tests are often used just as qualitative parameters or reference values. Even though sometimes the results of cone penetration tests are used to obtain the bearing capacity and deformation parameters of soil foundation from the criterion tables ，but these bearing capacity and deformation parameters are too larger than actual values to be used. Based on the principle of cone dynamic penetration test ，a reasonable relationship between the dynamic penetration test results and the parameters of foundation soil mechanics is presented through analyzing the reason why dynamic penetration test results are often much larger than their normal values. Ther