土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (2): 265-268.

• 测试技术 • 上一篇    下一篇

某场地砂土标贯试验N 值与剪切指标相关性分析

张向营1,2，周玉凤1,2，杨浩军1,2，滕红军1,2，杜 靓1,2，郑幸燮1,2   

  1. （1.北京城建勘测设计研究院有限责任公司，北京 100101；2.城市轨道交通深基坑岩土工程北京市重点实验室，北京 100101）
  • 收稿日期:2020-10-30 修回日期:2020-11-20 出版日期:2022-04-30 发布日期:2022-04-27
  • 作者简介:张向营（1993-），男，硕士，研究方向为岩土工程勘察。

Correlation Analysis Between N-Value and Shear Strength Indices of a Sandy Soil

ZHANG Xiangying1,2, ZHOU Yufeng1,2, YANG Haojun1,2, TENG Hongjun1,2, DU Liang1,2, ZHENG Xingxie1,2   

  1. (1.Beijing Urban Construction Survey and Design Institute Co. Ltd., Beijing 100101;
    2.Beijing Key Laboratory of Geotechnical Engineering for Deep Excavation of Urban Rail Transit, Beijing 100101)
  • Received:2020-10-30 Revised:2020-11-20 Online:2022-04-30 Published:2022-04-27

摘要： 基于对某场地典型砂土层工程性质认识的加深，提出了砂层的标贯击数值与剪切指标的拟合公式，并与规范公式、前人研究成果进行了对比分析，结果显示，以往在进行本地区砂层剪切指标赋值时相对偏保守，可以在原有经验值基础上适当提高。粘聚力经验公式表明本场地砂土粘聚力与标贯击数整体上呈负相关关系，内摩擦角经验公式相比Peck等三种模型，在结果准确性方面有了一定的提升。为此类场地砂土层剪切指标赋值提供了一种新思路，在一定程度上节约了工程成本，研究结果对类似工程有一定的参考价值。

关键词: 砂土, 标贯试验, 剪切指标, 相关性分析

Abstract: Based on the increasingly understanding of the engineering properties of typical sandy soils, the empirical relationship between the Standard Penetration Test (SPT) N values and the shear strength indices is proposed. The proposed relationship was compared with the results of current design code recommended formula as well as the previous proposed relationship. The comparative results indicate that, compared with the proposed relationship, conservative design is usually obtained from both code recommended and previous recommended relationships when it is applied into the typical sandy soils. The design values could be slightly improved by applying the proposed empirical recommendations. The empirical formula for the cohesion shows that the cohesion of sandy soils and the SPT N values are reversely correlated. The empirical formula for the internal friction angle has a slight improvement in the accuracy of the results compared with the Peck and other three models. The proposed relationship provides a new approach for the evaluation of shear strength indies of the sandy soils in the studied site, and potentially saves the construction cost.

Key words: sandy soils, standard penetration test, shear strength indices, correlation analysis

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