摘要
采用数值方法分析地下洞室开挖后的岩体塑性开裂区,与实际情况差异较大;主要取决于选择的塑性流动判别准则,因此采用声波测试确定围岩松动圈,界定标准存在一定的模糊性和经验性,实际操作困难也较大。根据围岩松动的主要影响因素,结合实验研究成果,基于施工开挖的声波资料,在统计分析的基础上给出洞室松动圈判别的数学模型。根据监测资料,通过挖掘数据发展的潜在规律,运用监测位移时间和空间上的特性,提出主级松动、松动扩展百分比等新概念。该方法为洞室围岩整体性稳定和围岩松动评判拓展新的思路,并为地下厂房洞室的监测资料分析和开挖质量评估,提供有效方法,同时对其他类似工程也提供一定的借鉴作用。
When conducting numerical analysis of plastic cracking zone of rock mass subjected to underground excavation, its results mainly depend on the adopted plastic flow criterion. Therefore, the discrepancy between numerical results and practical engineering is often considerable. The criterion for excavation disturbed zone（EDZ） is still not clear and only empirical, and the acoustic emission（AE） also lacks efficiency and accuracy in engineering practices. Based on the analysis of major influencing factors and a review of several experiments, the mathematical model for determining EDZ of underground caverns is put forward. The proposed model is based on analyzing AE data derived from construction process and statistical treatments. According to the abundant data, the underlying laws of EDZ development are analyzed by data mining. Some new concepts, such as major disturbed zone and percentage of spreading disturbed zone, are proposed by analyzing temporal and spatial characteristics of monitored displacements. The proposed method provides a new approach for determining general stability and disturbed degree of surrounding rock in underground caverns. Also, it provides an effective approach for analyzing monitoring data and assessing excavation quality of underground caverns. It can be referenced by other similar projects as well.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第3期513-519,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家科技支撑计划项目(2008BAB29B01)
国家自然科学基金重大研究计划项目(90715042)
国家杰出青年科学基金项目(50725931)
关键词
地下工程
围岩松动圈
监测数据
主级松动
松动扩展
开挖质量评估
underground engineering
excavation disturbed zone（EDZ）
monitoring data
major disturbed zone
spreading disturbed zone
assessment of excavation quality
