绢云母化千枚岩各向异性特性及长期强度试验研究

Experimental study on long-term strength and anisotropic characteristics of sericite phyllite

对于承受高水平荷载、工作年限长的岩石边坡工程,获取岩石的长期强度,具有十分重要的意义。通过对岩质边坡中绢云母化千枚岩试件进行单轴压缩试验和分级加载单轴蠕变试验,在常规试验数据的基础上,研究了绢云母化千枚岩强度的各向异性特征和长期强度。研究结果表明：1相同加载条件下,随着层理面与轴向力加载方向夹角的增大,强度值是一个先减小后增大的过程,当夹角等于30°左右时,强度最低;2绢云母化千枚岩的长期强度大约为其单轴抗压强度的60.40%~82.71%。该结果为岩质边坡工程的安全和设计提供了有力依据。

It＇s very important to obtain the long-term strength of rock for rock slope engineering which under high levels loading and long working years. Laboratory experiments on the serieite phyllite specimens in rock slope under uniaxial compression and uniaxial creep with step-loading were carried out. On the basic of test data, the long-term strength and anisotropic characteristics of strengths of sericite phyllites were studied. The results indicate that： （1）With the increase of angles between bedding planes and axial-stress loading directions, the strengths are increase first and then decrease in the same load conditions. And the minimum value of strengths appears at the angle of 30°; （2）The long-term strength of sericite phyllite is 60.40% - 82. 71% of the compressive strength. The test results could provide a favorable basis for the safety and design of rock slope engineering.