摘要
大断面硐室开挖往往需要对变形进行严格控制,结合山西引黄工程的地下硐室工程,运用数值分析方法模拟分析仅采用浅层锚杆及浅层锚杆与深层锚索的联合支护围岩稳定情况。在围岩条件较好的地下硐室施工中,仅采用浅层锚杆或浅层锚杆与深层锚索联合支护均能保证围岩稳定性;模型计算中,仅采用浅层锚杆时位移分布较为明显,且由于硐室的不规则,导致锚杆出现应力集中现象,当采用联合支护时,锚杆应力分布较为均匀;同时通过对各个阶段的位移曲线图与支护结构的内力分析,认为联合支护对位移控制更为有利;采用浅层锚杆支护和联合支护施工,计算结果中位移分布差异性较大,综合考虑,采用联合支护更加有利于硐室的安全。
The excavation of large section chamber often requires strict control of deformation.In combination with the underground chamber project of Shanxi Yellow River Diversion Project,numerical analysis method is used to simulate and analyze the stability of surrounding rocks supported only by shallow bolts and combined support of shallow bolts and deep bolts.In the construction of underground chamber with better surrounding rock conditions,only shallow anchor or combined support of shallow anchor and deep anchor cable can ensure the stability of surrounding rock.In model calculation,displacement distribution is obvious only when shallow anchor is used,and stress concentration occurs in anchor due to irregular chamber.When combined support is used,the stress distribution of bolt is more uniform.At the same time,through the analysis of displacement curve and internal force of support structure at each stage,it is considered that joint support is more advantageous to displacement control.When shallow bolt support and combined support are used,the difference of displacement distribution in calculation results is great.Considering comprehensively,combined support is more advantageous to the safety of tunnel chamber.
作者
贾增明
梁波
戴仕鹏
JIA Zeng-ming;LIANG Bo;DAI Shi-peng(SINOHYDRO BUREAU 14 CO.,LTD.,Kunming 650000,China;College of Architectural Engineering,Kunming University of Technology,Kunming 650000,China)
出处
《云南水力发电》
2021年第4期20-26,共7页
Yunnan Water Power
关键词
大断面硐室
数值分析
浅层锚杆与深层锚索
联合支护分析
large section cavern
numerical analysis
shallow bolt and deep bolt
bolt and cable support analysis
