某地区非饱和粉土抗液化强度的试验研究  

Experimental Study on Liquefaction Resistance of Unsaturated Silty Soil in a Region

作　　者：陈林志 罗军尧 王昆 Chen Linzhi;Luo Junyao;Wang Kun(Faculty of Civil Engineering,Kunming University of Science and Technology,Kunming 650500,China;Power China Kunming Engineering Corporation Limited,Kunming 650051,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]中国电建集团昆明勘测设计研究院有限公司,昆明650051

出　　处：《科技通报》2024年第6期67-71,共5页Bulletin of Science and Technology

基　　金：云南省基础研究计划项目青年专项(202301AU070022);干湿循环条件下根系加固红黏土边坡技术研究(毕科联合[2023]55号)。

摘　　要：以往研究表明液化主要发生在饱和土中,但对于非饱和粉土也有液化现象发生。本文利用《建筑抗震设计规范》(GB 50011-2010)中的“标贯法”对山东省乐陵市的非饱和粉土液化程度进行判别,并引用Andrus提出的抗液化应力比CRR (cyclic resistance ratio),对乐陵市非饱和粉土进行分析研究。研究结果表明:16个试验点中接近70%的试验点被判断为液化点;对于埋深小于7 m的非饱和粉土,其孔隙比是影响液化的一个重要因素,孔隙比与抗液化能力呈现出较好的相关性;在7 m内的埋深范围内,浅层的非饱和粉土抗液化能力更强;当埋深超过某一深度界限(7~9 m)时,孔隙比对抗液化能力的影响较小,埋藏深度的影响较为显著,深度大的非饱和粉土的抗液化能力更强。研究结果为工程中判断非饱和粉土液化及其影响因素提供参考。Previous studies have shown that liquefaction mainly occurs in saturated sandy soils,but liquefaction has also occurred in unsaturated silty soils.This paper uses《the standard penetration method in the Code for seismic de-sign of buildings》(GB 50011-2010)to distinguish the liquefaction of unsaturated silt soil in Leling and analyzes the unsaturated silt soil in Leling by using the cyclic resistance ratio(CRR)proposed by Andrus.The results showed that nearly 70%of the 16 test sites were judged as liquefaction sites.For unsaturated silty soil with buried depth less than 7 m,the pore ratio is an important factor affecting liquefaction,and the pore ratio has a good correlation with the liquefaction resistance.In the depth range of 7 m,the shallow unsaturated silty soil has better liquefaction resistance.When the burial depth exceeds a certain depth(7-9 m),the effect of pore ratio on anti-liquefaction ability is small,but the effect of burial depth is more significant.The unsaturated silty soil with greater depth has stronger anti-liquefac-tion ability.This study provides some reference value for judging the liquefaction of unsaturated silty soil and its influ-encing factors in engineering.

关 键 词：非饱和粉土 液化 抗液化强度 

分 类 号：TU413[建筑科学—岩土工程]