围限作用下半充填裂隙变形模量特征

Characteristic of Deformation Modulus of Half-Filled Fissue under Confining Condition

采用微机控制万能材料试验机,通过轴向压缩、侧向约束的实验方式,以不同水泥砂配比样品作为充填介质,分别研究了同配比和同隙宽条件下的非全充填裂隙的变形模量。实验结果表明:在充填裂隙变形初期充填介质形态开始发生变化,随着应力的增大充填介质进入孔隙,最后直至组织密实,造成变形模量动态变化的特点;变形模量随应力的增大而增大;配制比例1∶2的充填裂隙的变形模量较大,且配制比例1∶2、1∶4、1∶6、1∶8的充填裂隙的变形模量呈现依次减小的趋势;同配置比充填裂隙的变形模量随应力的增大而增大,相同配制比例,不同充填裂隙宽度下,充填裂隙隙宽越大,充填裂隙的变形模量就越小。

In order to understand the deformation modulus of half-filled fissue in different filling conditions,by using WDW200 D,with experiment under the axial compression and lateral restraint conditions,the deformation modulus of half-filled fissue was studied under the condition of the same mix proportion of sample from different cement and sand and the same width of crack. The experimental results showed that： in the early deformation of filled fracture,the shape of filling medium began to change. The space of fissue was filled with filling medium and finally the medium became dense with the increase of the stress. It caused that deformation modulus had dynamic characteristics. The deformation modulus increased with the increase of the stress; as the mix proportion of cement mortar was 1 ∶ 2,the deformation modulus of filled fissue changed greatly. When the mix proportion of cement mortar was 1 ∶ 2,1 ∶ 4,1 ∶ 6,1 ∶ 8,the deformation modulus of filled fissue showed that it had a tendency to gradually decrease. The deformation modulus of filled fissue in the same configuration ratio of cement mortar condition increased with the increase of the stress. The larger crack width of filled fissue,the smaller deformation modulus of filled fissue will be in the same mix proportion of cement mortar and the different width of filled fissue conditions.