CPTU-based modified soil behavior type index classification 
method and its application

DENG Yu-chen; CHEN Zhi-bo; ZHENG You-qiang; PAN Sheng-gui

doi:10.16285/j.rsm.2021.0713

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CPTU-based modified soil behavior type index classification method and its application

更新时间：2026-06-25

- CPTU-based modified soil behavior type index classification method and its application
- Vol. 43, Issue 1, Pages: 227-234(2022)
- 作者机构：
  
  1. 福州大学紫金地质与矿业学院岩土与地质工程系,福建,福州,350116
  2. 福州大学地质工程福建省高校工程研究中心,福建,福州,350116
  3. 华东勘测设计院（福建）有限公司,福建,福州,350007
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2021.0713
  CLC： TU413
- Online First：07 January 2022，
  
  Published：2022
- 稿件说明：
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DENG Yu-chen, CHEN Zhi-bo, ZHENG You-qiang, et al. CPTU-based modified soil behavior type index classification method and its application[J]. 2022, 43(1): 227-234.
DOI：

DENG Yu-chen, CHEN Zhi-bo, ZHENG You-qiang, et al. CPTU-based modified soil behavior type index classification method and its application[J]. 2022, 43(1): 227-234. DOI： 10.16285/j.rsm.2021.0713.

摘要

孔压静力触探（piezocone penetration test，简称CPTU）常被应用于土层划分、土体分类，其各种土体分类方法有一定的适用性和局限性。引用两组实际工程案例，对5种常用的基于CPTU的土体分类图进行了分析比较。分析表明，已有分类图虽然能够区分黏性土和无黏性土，但对于粉质黏土、粉土和粉砂之间的判别均存在较大误差，且多数分类图采用过渡带分类，导致分类结果的准确性偏低。基于Robertson土类指数分类图，根据实际CPTU测试数据分类结果，对土类指数Ic进行了修正，将其同心圆模型修正为平行线模型，由此提出一种基于CPTU的修正土类指数土体分类方法。根据对实测数据的应用表明，提出的修正土类指数土体分类方法可以更好地满足土体分类，且能够满足粉质黏土、粉土和粉砂之间的判别。

Abstract

The piezocone penetration test (CPTU) is widely applied in soil layer division and soil classification. However

its various soil classification methods have certain applicability and limitations. Five common classification charts are analyzed based on two groups of practical engineering cases. The results show that the existing classification chart can well distinguish cohesive soil and non-cohesive soil

but there are certain errors in the discrimination between silty clay

silty and silty sand. Besides

most classification charts adopt the transitional zone method

which will underestimate the classification accuracy. In this study

according to the actual test data classification results

the soil behavior type index Ic is modified through the soil behavior type index classification chart by Robertson. As a result

a new method of CPTU based modified soil behavior type index is proposed by modifying the concentric circle model to a parallel line model. The application results show that the proposed classification method can well satisfy the classification of practical engineering soil and the discrimination between silty clay

silty soil and silty sand

respectively.

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