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Creep properties and permeability evolution in triaxial rheological tests of hard rock in dam foundation
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  • 分类:TU455[建筑科学—岩土工程;建筑科学—土工工程] TE319[石油与天然气工程—油气田开发工程]
  • 作者机构:[1]Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China, [2]College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China, [3]Kunming Design and Research Institute, China Hydropower Consulting Group Co., Kunming 650051, China
  • 相关基金:Projects(I1172090, 51009052, 51109069) supported by the National Natural Science Foundation of China; Project(2011CB013504) supported by the National Basic Research Program of China
中文摘要:

Triaxial 爬测试被使用岩石 servo-controlled triaxial 流变学测试在渗出物压力下面执行设备。基于试验性的结果,岩石 rheological 性质由联合的渗出物压力影响了被学习,并且渗出物的变化与时间评价在完全爬岩石的过程被分析。当应用压力是不到失败压力水平时, creep 变丑不是明显的,这被显示出,并且它的主要形式是不变的爬。什么时候使用了压力水平,比大或折断应力的不到 but 结束,看见增加更容易爬变丑和更多明显加速爬特征。环绕爬变丑显然比高轴爬变丑。在阶段不变爬,渗出物流动率的一般水准在附近 4.7 察觉到电路。而且,一个察觉到的边缘测试电路是职业人员监 ? 监吗??

英文摘要:

Triaxial creep tests were carried out under seepage pressure by using rock servo-controlled triaxial rheology testing equipment. Based on experimental results, rock rheological properties influenced by seepage-stress coupling were studied, and variations of seepage rate with time in complete creep processes of rock were analyzed. It is shown that, when the applied stress is less than failure stress level, the creep deformation is not obvious, and its main form is steady-state creep. When applied stress level is greater than or less than but close to fracture stress, it is easier to see the increase of creep deformation and the more obvious accelerative creep characteristics. The circumferential creep deformation is obviously higher than the axial creep deformation. At the stage of steady-state creep, the average of seepage flow rate is about 4.7×10-9 rn/s at confining pressure (tr3) of 2 MPa, and is about 3.9×10-9 m/s at a3 of 6 MPa. It is seen that the seepage flow rate at or3 of 2 MPa in this case is obviously larger than that at tr3 of 6 MPa. At the stage of creep acceleration, the seepage flow rate is markedly increased with the increase of time. The variation of rock permeability is directly connected to the growth and evolution of creep crack. It is suggested that the permeability coefficient in complete creep processes of rock is not a constant, but is a function of rock creep strain, confining pressure, damage variable and pore water pressure. The results can be considered to provide a reliable reference for the establishment of rock rheological model and parameter identification.

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