砂土边坡稳定性土工离心模型试验  

Geotechnical centrifugal model test on sandy soil slope stability

作　　者：罗强[1,2] 朱江江[1,2] 张瑞国[1,2] 蒋良潍[1,2] 张正[1,2] LUO Qiang1, 2 ZHU Jiangjiang1,2, ZHANG Ruiguo1,2, JIANG Liangwei1, 2, ZHANG Zheng1, 2(1. School of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China; 2. MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, Chin)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031

出　　处：《岩石力学与工程学报》2018年第5期1252-1259,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2013CB036204);中央高校基本科研业务费专项资金项目(2682013ZT12)~~

摘　　要：基于土工离心模型试验技术,研究砂土边坡稳定性随边坡坡度和含水率变化的规律,分析离心荷载作用下砂土边坡的变形特性及破坏模式,讨论较高含水率砂土存在的水分迁移现象对边坡稳定性的影响机制;同时,作为2013年全国岩土工程离心模型平行试验的内容之一,结合其他实验室的测试数据,对砂土边坡离心模型试验的误差概率特征进行了分析。研究表明:砂土边坡的变形表现出显著的脆性破坏特征,破坏模式为近似直线状破裂面的浅层溜滑。在水分迁移微弱条件下,各实验室平行试验的模型边坡破坏离心加速度与边坡坡度的关系具有高度的一致性;较高含水率的砂土在试验过程中存在水分迁移现象引起砂土强度显著改变,是影响砂土边坡稳定性的本质原因;砂土边坡破坏离心加速度的统计值具有正态分布特征,试验误差以随机为主,但也存在明显的系统误差。研究成果加深了对土工离心模型试验技术的认识。The effects of slope gradient and soil moisture content on the stability of sandy soil slopes were investigated with the geotechnical centrifugal model test,the deformation characteristics and failure modes of sandy soil slopes under centrifugal load were analyzed and the mechanism of water migration influencing the slope stability was discussed. Meanwhile,the test results together and the data from other laboratories in the parallel tests of geotechnical centrifugal modeling that were performed in 2013 were analyzed on the characteristics of error probability of centrifugal model test on sandy soil slopes. It is shown that the deformation of the sandy soil slope presents obvious brittle failure characteristics,and the failure mode features the shallow slippery with a straight linear failure plane. There is a close relationship between the centrifugal acceleration at failure and the slope gradient under the condition of weak water migration. The water migration that exists in sand with high moisture content leads to the remarkable variation of the sand strength,which is the essential factor affecting the stability of the sandy soil slope. The statistical data of centrifugal acceleration at failure present the feature of normal distribution. Notable systematic error is observed in the test process,though the test error is mainly the random one.

关 键 词：边坡工程 离心模型试验 砂土边坡 稳定性 水分迁移 平行试验 

分 类 号：P642[天文地球—工程地质学]