原位土体受力状态特征研究  

STUDY ON THE STRESS STATE CHARACTERISTICS OF IN-SITU SOIL

作　　者：杨馨茹 王启 周涖泓 YANG Xinru;WANG Qi;ZHOU Lihong(School of Civil Engineering,Jilin University of Architecture and Technology,Changchun 130114,China;Jilin Jianzhu University Survey Limited Company,Changchun 130102,China)

机构地区：[1]吉林建筑科技学院土木工程学院,长春130114 [2]吉林建筑大学勘测有限公司,长春130102

出　　处：《低温建筑技术》2024年第9期64-68,85,共6页Low Temperature Architecture Technology

基　　金：吉林建筑科技学院校级科研项目(重点)“基于结构失效定律的地基承载力研究”(校科字[2021]022ZQKJ),(51978422)。

摘　　要：目前,判定土体强度与地基承载力的理论与方法众多,但是现有的设计承载力是通过经验和统计方法以相当大的随机变化性和离散性折减极限荷载而得到的。为了规避这种不确定性的影响,揭示原位土体受力状态特征,文中应用结构受力状态理论对载荷板沉降试验数据进行土体受力状态建模。首先将实测沉降数据转化为广义力的功(GFW),形成表征土体受力状态的特征参数。然后利用Mann-Kendall(以下简称M-K)准则判定特征参数随荷载变化曲线上的突变点。最后用结构受力状态分析方法得出的土体实质承载力与现行中国规范判定结果进行对比。结果表明应用结构受力状态理论能进一步判定土体的实质强度与弹塑性分支(EPB)强度,并且可将弹塑性分支强度直接作为土体的设计荷载,在保证安全的前提下更合理地设计地基承载力。Currently,theories and methods for determining soil strength and foundation bearing capacity are numerous.However,the existing design bearing capacities are derived from empirical and statistical methods that reduce ultimate loads with considerable randomness and variability.To mitigate this uncertainty and reveal the in-situ stress state of soil,this paper applies structural stress state theory to model the soil stress state using load plate settlement test data.First,the measured settlement data are converted into generalized work of force(GFW)to form characteristic parameters representing the soil stress state.Then,the Mann-Kendall(M-K)criterion is used to identify abrupt changes in the characteristic parameters along the load variation curve.Finally,the soil's effective bearing capacity obtained through structural stress state analysis is compared with the current Chinese standard results.The results indicate that applying structural stress state theory can further determine the actual soil strength and elastic-plastic branch(EPB)strength,and the EPB strength can be directly used as the design load for soil,allowing for a more rational design of foundation bearing capacity while ensuring safety.

关 键 词：原位土体 荷载板沉降 土体弹性状态 安全裕度 

分 类 号：TU432[建筑科学—岩土工程]