某地红砂岩多轴受力状态蠕变松弛特性试验研究  

Multi-axial experimental study on creep and relaxation properties of red sandstone from somewhere

作　　者：李铀[1] 朱维申[2] 彭意[1] 李铌[1] 黄超强[3] 

机构地区：[1]中南大学土木建筑学院 [2]山东大学岩土与结构工程研究中心 [3]中交第二公路勘察设计研究院,武汉430052

出　　处：《岩土力学》2006年第8期1248-1252,共5页Rock and Soil Mechanics

基　　金：湖南省科技计划重点项目(No.05FJ2006);湖南省自然科学基金(No.04JJ6002);中南大学科学研究基金资助课题(No.76163)

摘　　要：与岩石单轴蠕变松弛试验研究相比,多轴的研究结果很少,这一现状的结果是岩石的三维蠕变松弛模型基本是其单轴模型的简单推广,缺乏试验资料的佐证。为了积累宝贵数据,推动岩石多轴蠕变松施模型的发展,利用广东某地的红砂岩开展了以下试验研究:(1)不同围压下岩石的蠕变松弛特性;(2)二向受力状态下岩石的蠕变松弛特性;(3)多轴受力时,饱水和风干状态下岩石蠕变松弛特性的对比。总结、分析试验结果,获取了该种红砂岩多轴蠕变松弛特性的一些基本规律或现象,如:轴压相同时,侧压越高,蠕变量越小;当围压相同、时间相同时,应力σ1越高,则σ1的松弛量也越大。这些结果对于岩石力学的基础研究及现场施工设计均具有较大意义。Compared with uniaxial experimental study on creep and relaxation properties of rock, multi-axial experiment study is very few, which makes 3-D creep and relaxation model of rock to be just simply extension without enough experiment verification. For gathering useful data and prompting development of multi-axial creep and relaxation model of rock, the following experiments were done with the red sandstone obtained from somewhere in Guangdong Province, China： （1） creep and relaxation properties of rock under different confining pressure; （2） creep and relaxation properties of rock subjected to pressures from two directions; （3） comparison of creep and relaxation properties between air-dried and saturation samples under multi-axial pressure. By analyzing experimental results, some features or phenomena are found on creep and relaxation properties of the red sandstone, for example, when axial pressures are the same, the higher confining pressure is, the smaller creep is, when confining pressures and relaxation time are the same, the higher σ1 is, the larger relaxation of σ1is; etc.. All these are of some significance to theoretical study of rock mechanics and the design and construction of practical engineering.

关 键 词：岩石力学 蠕变 松弛 饱水 红砂岩 

分 类 号：TU458.4[建筑科学—岩土工程]