摘要
通过对较大尺寸的单裂隙岩体试块进行不同侧面加载的渗流试验,在实验室里开展了单裂隙流 固耦合渗流研究,模拟核废料贮藏库的围岩自由面的最危险部位的渗流量 应力耦合状态。分析了裂隙岩体渗流与应力的耦合机理,获得了几种典型情况下的试验数据,并拟合出不同应力条件下单裂隙岩体渗流量与应力间数学经验公式。从而说明并非任一方向的应力增加都能使渗流量减小,而是裂隙岩体的渗流量随着双向压应力的增加而减少,随着平行于裂隙面方向的单向压应力的增加而增加。缝隙开度虽然随着法向应力的增加而逐渐减小,但最终不可能完全闭合,所以,此时流量不可能为零。同时,在试验过程中还通过闭环控制来实现被加载面的均匀受力,这为大尺寸岩体试验提供了一种很好的加载方法。
The experimental study was conducted with a large rock containing one fracture under different confined stresses on differentfaces. It simulated the Hydro Mechanical(HM) couplingstates of the most dangerou sposition of nuclearwasteisolators. ThemechanismofHMcouplingwasanalyzedwithtypicalexperi mentaldata, andarelationshipbetweenstressandtheseepagefluxunderdifferentstressfieldswasyielded. It showsthatnotalltheincreaseofstressinonecertaindirectionwouldinducethedecreaseoftheflow. Theflow willdecreaseasthenormalpressurerises. Itwillincreasewiththeshearingstress. Thefracturewouldnotbe completelyclosedwiththenormalstressincreasing. Thereforethefluxwouldnotbezero. Inaddition, agood solutionofclosed circlecontrolwasprovidedtomakethepressureequilibratedoneachfaceofthelargerock intheexperiments.
出处
《实验力学》
CSCD
北大核心
2005年第1期10-16,共7页
Journal of Experimental Mechanics
基金
国家自然科学基金(10102020)
973项目(G1999032805)资助
