海底隧道风化花岗岩流变试验研究  

Testing study of rheological characteristics of weathered granite in undersea tunnel project

作　　者：赵旭峰[1] 孙钧[2] 

机构地区：[1]中国国际工程咨询公司,北京100044 [2]同济大学地下建筑与工程系,上海200092

出　　处：《岩土力学》2010年第2期403-406,共4页Rock and Soil Mechanics

基　　金：厦门市路桥建设投资总公司基金资助项目(No.2004056148)

摘　　要：采用全自动三轴流变试验机对厦门东通道海底隧道风化槽地段岩石进行三轴压缩流变试验,研究了岩石在不同围压和不同应力水平作用下轴向应变随时间的变化规律。试验表明,强风化花岗岩时效特性较全风化花岗岩更加明显;围压对岩石蠕变变形存在很大影响,围压越大,蠕变变形量越小。通过分析岩石压缩流变过程中应力-应变关系可知,蠕变变形在弹性阶段不对岩石整体构成明显损伤。而进入塑性阶段后,黏塑性变形对岩石破坏影响较大。建议通过支护增加围压,以提高隧道围岩屈服强度和减小流变变形,防止隧道失稳破坏。In order to know about the theological characteristics of rock specimens in undersea tunnel project, a series of triaxial compression rheoIogical experiments were carried out on the rock servo-controlling rheology testing machine. Results show that creep characteristics of intensely weathered granite is more obvious than full weathered granite; and that creep deformation of rock greatly depends on the confining pressure. With increase of confining pressure, creep deformation of rock will decrease. By analysis of stress-strain relation, creep deformation has few effects on damage of rock during elastic stage; whereas viscoplasticity deformation has more effects on damage of rock during plastic stage. In order to keep stability of tunnel, confining pressure should be increased to improve yield strength of surround rocks and decrease rheological deformation by strengthening supporting structure.

关 键 词：海底隧道 风化花岗岩 三轴流变试验 蠕变特性 

分 类 号：TU458[建筑科学—岩土工程]