摘要
为研究软弱围岩隧道塌方段的力学性状和处治方案,以拴马岭隧道为例,通过现场监测和数值模拟手段,对软弱围岩隧道塌方成因以及采用小导管环向注浆、锁脚锚杆、小导管超前注浆治理软弱围岩隧道塌方的效果进行了分析。结果表明:软弱围岩隧道塌方是以陡倾角断裂面发生剪切滑移为主因的剪切滑移型塌方;相比锁脚锚杆而言,系统锚杆对伴有土质的砂岩作用效果较差;环向注浆加固可有效遏制围岩塑性破坏的发展;三层小导管注浆在土质砂岩中加固效果突出,其加固段沉降最大值为10mm,是环向注浆加固段的28.5%;锁脚锚杆在围岩软弱段加固效果优于坚硬围岩。
In order to investigate mechanical properties and treatment measures of collapse sections in weak surrounding rock, the Shuan Mazhuang Tunnel is taken as an example, the contributing factors of soft rock tunnel collapse and the treatment effects of small duct radial grouting, feet-lock bolt and advanced small pipe grouting in soft rock tunnel collapse are discussed by field measurements and numerical simulation. The results indicate that, the soft rock tunnel collapse is shearing slip collapse which is mainly caused by shearing slip occurred in steep dip fault plane. System bolt have poor effects on reinforcement, compared with the feet-lock bolt. Small duct radial grouting can effectively curb the plastic failure development of soft surrounding rock. Three layer small duct grouting reinforcement effect in clay sandstone is prominent, since the maximum settlement of three layer small duct grouting reinforcement section is 10 mm which accounted for 28.5% of small duct radial grouting reinforcement section. The reinforcement effect of feet-lock bolt in soft rock is better than in hard rock.
出处
《应用力学学报》
CAS
CSCD
北大核心
2015年第3期384-389,4,共6页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51408554)
长安大学中央高校基本科研业务费专项资金资助项目(2013G1502027
2013G3214011)
陕西省工业科技攻关项目(2015GY185)
关键词
隧道工程
软弱围岩
塌方处治
现场测试
数值模拟
tunnel engineering,soft surrounding rock,collapse treatment,field measurement,numerical simulation
