贵州某区域全风化膨胀岩膨胀特性试验研究  

Experimental Study on Expansion Characteristics of Fully Weathered Expansive Rock in an Area of Guizhou of High Speed Railway

作　　者：李林[1] 吴光[1] 王金淑[1] 饶鸿 连奇 LI Lin;WU Guang;WANG Jinshu;RAO Hong;LIAN Qi(Southwest Jiaotong University,Chengdu 610031 , China)

机构地区：[1]西南交通大学,成都610031

出　　处：《高速铁路技术》2018年第2期43-48,83,共7页High Speed Railway Technology

摘　　要：本文选取初始含水率、干密度、初始加压荷载值三个主要因素,分析研究区岩土体膨胀率、膨胀力在以上三个因素作用下的变化规律,建立膨胀力与初始含水率、干密度、初始加压荷载间的关系。研究的结论:(1)干密度越大,试样达到膨胀稳定阶段需要的时间越长。无论在任何含水率状态下,试样的变形量随干密度的增大而显著增大;(2)初始含水率对无荷载状态的一维膨胀速率的影响较干密度大,干密度对无荷载膨胀率大小的影响较含水率大;(3)土体平衡膨胀力与干密度之间满足指数关系,膨胀应变与竖向应力呈logistic函数关系。In this paper, main factors, such as initial moisture content, dry density and pressure load value are selected to analyze the change law of rock and soil swelling rate and expansion force under the above three factors. The relationships between expansion force and initial moisture content, dry density, and pressurized loads are made. The main research results are as follows ： （1） the bigger the dry density, the longer the sample needs to reach the expansion stabilization phase. The deformation of the specimen increases significantly with the increase of the dry density in any water content state. （2） The initial moisture content has a greater influence on one-dimensional expansion rate of the no-load state than dry density. While, the effect of dry density on the size of no-load expansion rate is greater than that of moisture content. （3） The relationship of equilibrium expansion force of soils and dry density satisfies the exponential relationship, and the relationship between the expansion strain and the vertical stress is logistic functional relationship.

关 键 词：膨胀率 膨胀力 指数关系 膨胀应变 

分 类 号：TU443[建筑科学—岩土工程]