| 三维裂隙间距对砂浆材料力学特性的影响 |
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| 引用本文： | 杨磊,李术才,郭彦双,朱维申,林春金.三维裂隙间距对砂浆材料力学特性的影响[J].岩土力学,2010,31(1):32-38. |
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| 作者姓名： | 杨磊 李术才 郭彦双 朱维申 林春金 |
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| 作者单位： | 1. 山东大学,岩土与结构工程研究中心,济南,250061
2. 山东大学,岩土与结构工程研究中心,济南,250061;中国地震局地质研究所地震动力学国家重点实验室,北京,100029 |
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| 基金项目： | 国家杰出青年科学基金，国家自然科学基金 |
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| 摘 要： | 采用刚性伺服试验机和声发射仪器,研究了预置三维裂隙间距对砂浆材料力学特性的影响,总结了含裂隙试件的破坏过程。综合分析单轴压缩应力-应变曲线和声发射数据可知,含三维裂隙试件的破坏主要由预置裂隙扩展、贯通造成,破坏过程可以分为微裂纹萌生、预置裂隙起裂、扩展、贯通几个基本阶段,试件最终破坏型式为单斜面剪切破坏。裂隙间距d与椭圆形裂隙长轴2c之比(d/2c)在0～1范围内,随着d/2c值增大,试件起裂应力σi和峰值强度σp有降低的趋势。当d/2c值从1/3增至2/3时,σi和σp发生突降,可见此范围为影响强度的敏感区间。d/2c值为1的试件σi和σp最低,相对完整(无预置裂隙)试件分别降低了22.48%和18.60%。裂隙间距不同的试件σi和σp之比变化范围为83.1%～78.9%,且随d/2c值增大,σi/σp有下降趋势。可见裂隙间距越大,从起裂应力到峰值应力的承载空间越大,这对工程实践有一定参考价值。
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| 关 键 词： | 砂浆试件 声发射 裂隙间距 起裂应力 峰值强度 |
| 收稿时间： | 2008-06-05 |
Influence of space between 3D-cracks on mechanical feature of mortar material |
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| YANG Lei,LI Shu-cai,GUO Yan-shuang,ZHU Wei-shen,LIN Chun-jin.Influence of space between 3D-cracks on mechanical feature of mortar material[J].Rock and Soil Mechanics,2010,31(1):32-38. |
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| Authors: | YANG Lei LI Shu-cai GUO Yan-shuang ZHU Wei-shen LIN Chun-jin |
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| Institution: | 1. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China; 2. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China |
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| Abstract: | The rigid serve-controlled test machine and acoustic emission equipment are used to study the influence of space between 3D-cracks on the mechanical feature of mortar material; and the failure process of samples with pre-existing cracks is concluded. The analysis of complete stress-strain curves and AE data indicates that sample failure is due to the propagation and coalescence of cracks. Failure process of samples with pre-existing cracks could be divided into the following stages: microcrack initiation, initiation of pre-existing cracks, crack propagation and crack coalescence. The failure pattern is shear failure along single inclined plane. When the ratio of cracks space d and length of elliptic crack long axis 2c ranging from 0-1, as the ratio grows, the initiation stress and maximum stress of samples reduce. With the ratio d/2c growing from 1/3 to 2/3, the initiation stress and maximum stress fall suddenly, showing that this space scope is the sensitive range. When the ratio d/2c =1, the initiation stress and maximum stress of sample fall 22.48 % and 18.60 % respectively corresponding to the sample without pre-existing cracks. The ratio of initiation stress to maximum stress of all different samples ranges from 83.1 % to 78.9 %. As the ratio d/2c grows, the ratio of initiation stress to maximum stress declines, which indicates that as space d grows, the loading range between initiation stress and maximum stress increase. |
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| Keywords: | mortar material sample acoustic emission space between cracks initiation stress maximum stress |
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