Characteristic state lines and subarea of initial state 
of sand under undrained shearing

WANG Ning-bo; YAO Yang-ping

doi:10.16285/j.rsm.2023.1111

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Characteristic state lines and subarea of initial state of sand under undrained shearing

更新时间：2026-06-25

- Characteristic state lines and subarea of initial state of sand under undrained shearing
- Vol. 44, Issue 11, Pages: 3165-3172(2023)
- 作者机构：
  
  1. 中国建筑科学研究院有限公司地基基础研究所,北京,100031
  2. 建筑安全与环境国家重点实验室,北京,100013
  3. 北京航空航天大学交通科学与工程学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2023.1111
  CLC： TU441
- Online First：28 November 2023，
  
  Published：2023
- 稿件说明：
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WANG Ning-bo, YAO Yang-ping. Characteristic state lines and subarea of initial state of sand under undrained shearing[J]. 2023, 44(11): 3165-3172.
DOI：

WANG Ning-bo, YAO Yang-ping. Characteristic state lines and subarea of initial state of sand under undrained shearing[J]. 2023, 44(11): 3165-3172. DOI： 10.16285/j.rsm.2023.1111.

摘要

砂土不排水特性表现出强烈的初始状态依赖性，为深入探究砂土这一特性，介绍了e-lnp（e为孔隙比，p为围压）平面内砂土已有与不排水特性有关的初始状态特征线，即最松固结线（loosest consolidation line，简称LCL）、静态液化分界线（static liquefaction dividing line，简称LDL）以及准稳态分界线（quasi steady-state dividing line，简称QDL），并在引入砂土正常压缩线（normal compression line，简称NCL）的基础上，结合剪胀和屈服理论，补充论证了LDL的存在性，给出了QDL的简易确定方法。基于特征状态线，将砂土初始状态进行了分区，分别为I静态液化区、II应变软化区、III准稳态区、IV应变硬化区，使得砂土在同一初始状态特征区表现出相似的不排水剪切特性。分析了初始状态分区的应用，包括理论应用与工程应用，以期为砂土不排水特性初始状态依赖性的理解及相关工程实际提供指导。

Abstract

The undrained behavior of sand is mainly dependent on its initial state. To better understand and reveal this feature

the characteristic state lines

namely the loosest consolidation line (LCL)

the static liquefaction dividing line (LDL) and the quasi steady-state dividing line (QDL)

which are related to the undrained behavior of sand in the e-lnp plane

are presented firstly. Based on the theory of shear yielding and dilatancy

a simple method used to determine QDL is given

and the existence of LDL is demonstrated by introducing the normal compression line (NCL) of sand. Subsequently

the initial state of sand is divided into four characteristic subareas

which can be referred to as the static liquefaction subarea I

the strain softening subarea II

the quasi-steady state subarea III and the strain hardening subarea IV

and sand shows the similar undrained behavior when its initial state places in the individual subarea. Finally

the theoretical and engineering applications of subarea are analyzed.

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