1000-7598 (2011) 10-2929-08
动力扰动下深部开挖洞室围岩分层
断裂破坏机制模型试验研究
左宇军1,2马春德3朱万成4李术才5宫凤强3陈春春6
1.贵州大学矿业学院,贵阳5500032.贵州大学贵州省非金属矿产资源综合利用重点试验室贵阳550003;
3.中南大学资源与安全工程学院,长沙4100834.东北大学岩石破裂与失稳研究中心,沈阳110006;
5.山东大学岩土与结构工程研究中心,济南250061;6.大连大学材料破坏力学数值试验研究中心,辽宁大连116622
摘要:为研究动、静组合加载下深部巷道围岩分区破裂化的机制,在Instron电液伺服材料试验机上对用石膏制作的深部洞室模型进行了动、静组合加载试验。为进一步分析动、静组合加载下深部巷道围岩分层断裂化的力学本质,将动、静组合加载下深部巷道围岩近似视为若干个二维动、静组合加载试样的组合体,并用红砂岩试样进行了二维动、静组合加载试验。试验结果表明,巷道轴向应力为最大主应力且大于一定值时,围岩会发生分层断裂现象;巷道轴向应力为最大主应力且与外部扰动应力叠加达到一定值时,围岩也会发生分层断裂现象;巷道直径越大,在相同的动、静组合加载条件下,更易发生分层断裂现象;相同直径的巷道,在不同的动、静组合加载作用下,巷道围岩分层断裂化程度小同,动、静组合应力叠加值越大,分层断裂化程度越严重;应力状态对试样裂纹扩展及分布方向起着主导作用,试样破裂面一般垂直于最小主应力方向(在最小主应力面内),与最大主应力方向一致;深部巷道围岩存在形成破裂圈的应力状态,这样的应力状态可诱发巷道围岩分区破裂现象的发生。
动、静组合加载;深部巷道;分区破裂;模型试验
TU452
A
Model test study of mechanism of layered fracture within surrounding rock
of tunnels in deep stratum tunnelling under dynamic disturbance
A Chun-deZI Shu-caiGONG Feng-qiangZUO Yu-junMHU Wan-chengL
CHEN Chun-chun
2011-04-27
基金项目:国家自然科学基金资助(No. 50874020,No.50934006,No.50874024); 973计划资助(No.2007CB209407);贵州省自然科学研究重点项目资助(黔教科2010003);贵州省科技计划项目资助(黔科合GY字(2011) 3063);贵州省高层次人才科研条件特助经费资助(2011年);贵州大
学引进人才科研项目资助(贵大人基合字(2010) 008号)。
左宇军,男,1965年生,博士,教授,主要从事岩石力学与采矿工程方面的教学与研究工作。E-mail: zuo.yuj un@yahoo.com.cn
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@ @ 动力扰动下深部开挖洞室围岩分层断裂破坏机制模型试验研究
作者:作者单位:
左宇军, 马春德, 朱万成, 李术才, 宫凤强, 陈春春, ZUO Yu-jun, MA Chun-de, ZHU Wan-cheng, LI Shu-cai, GONG Feng-qiang, CHEN Chun-chun
左宇军,ZUO Yu-jun(贵州大学矿业学院,贵阳550003;贵州大学贵州省非金属矿产资源综合利用重点试验室贵阳550003), 马春德,宫凤强,MA Chun-de,GONG Feng-qiang(中南大学资源与安全工程学院,长沙
,410083), 朱万成,ZHU Wan-cheng(东北大学岩石破裂与失稳研究中心,沈阳,110006), 李术才,LI Shu-cai(山东大学岩土与结构工程研究中心,济南,250061), 陈春春,CHEN Chun-chun(大连大学材料破坏力学数值试验研究中心,辽宁大连,116622)岩土力学
Rock and Soil Mechanics2011,32(10)
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