随机介质理论在地下厂房沉降研究中的应用

Application of stochastic medium theory to researching underground powerhouse settlements

基于随机介质理论模型,对地下工程开挖引起岩层和地表移动规律进行了分析.认为地下工程开挖引起岩层颗粒运动符合随机介质运动规律,提出了地下工程开挖地表沉陷三维计算模型,并以冶勒水电站地下厂房开挖所引起地表沉陷特征进行了具体分析,并将计算结果与实际观测数据进行对比分析,表明水平移动位移、变形均较小.又因地下厂房开挖较深,水平移动规律不如上层塌陷明显,且地表最大观测沉降值约为200mm,而最大计算值约为370mm;在地下厂房顶部,最大观测沉降值约为400mm,最大计算值约为440mm.最大水平移动计算值为100mm.数值计算的结论较为精确、可靠,显示出分层影响传递规律,并最终影响到地表.

Based on stochastic medium model,motion regularity of rock and ground surface from underground engineering excavation was researched.Shifting of ground surface particle from excavation coincides with stochastic medium model.Three dimensional computation model from underground engineering excavation was put forward.Sinkage feature of underground powerhouse excavation for Yele Hydropower Station was analyzed detailedly.Comparative analysis between computation data and observation results was fulfilled.The most observed value of settlement is about 200 mm;but most computational value is 370 mm.Most observation value is 400 mm on the heading position of underground powerhouse;but most computational value is 440 mm.Most horizontal displacement is 100 mm.Results show that the layered influence rules and settlement influence would present to ground surface.