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工程科学与技术:2018,50(2):50-59
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高地应力地区围岩劈裂破坏现场监测和能量耗散模型及应用
(1.山东大学 岩土与结构工程中心, 山东 济南 250061;2.山东大学 土建与水利学院, 山东 济南 250061)
Splitting Failure on Side Walls of Underground Cavern in High In-situ Stress Area and Applications of an Energy Dissipation Model
(1.Geotechnical & Structural Eng. Research Center,Shandong Univ.,Ji'nan 250061,China;2.School of Civil Eng.,Shandong Univ.,Ji'nan 250061,China)
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投稿时间:2017-06-02    修订日期:2017-10-30
中文摘要: 在进行埋深较大的地下洞室施工时,由于岩体的脆性特征,在高地应力作用下洞室围岩容易出现劈裂破坏。因此,在深部岩体开挖过程中,对围岩劈裂破坏区域的预测格外重要。本文从能量耗散原理出发,结合横观各向同性模型,采用劈裂破坏准则对模型单元应力状态进行判断,得到新的自定义横观各向同性计算模型,在此基础上对大岗山水电站大型地下洞室群开挖过程中的稳定性进行计算。在大岗山水电站大型地下洞室群开挖工程现场开展洞周围岩劈裂破坏区的监测,测得主厂房在进行各个开挖步开挖时主厂房与主变室之间岩桥中围岩的位移及劈裂破坏的情况。将现场监测结果与不同本构模型的稳定性分析计算结果进行对比,结果表明:大岗山水电站地下洞室群在进行开挖时,考虑能量耗散的横观各向同性模型计算所得的主厂房下游边墙劈裂区平均深度与现场监测结果最为接近。考虑能量耗散的横观各向同性模型可较好地反映主厂房与主变室之间岩桥内部围岩位移变化趋势,与现场监测情况吻合度较高;使用摩尔库伦模型及横观各向同性模型计算得到的曲线与监测值有较大区别。根据稳定性分析结果,主厂房下游边墙吊车梁位置关键点和主厂房洞中关键点开挖后洞壁出现的位移较大,其最大水平位移为29.46 mm;主厂房拱顶在开挖初期位移较大,拱顶竖直位移最大值为10.58 mm;主变室拱顶竖直位移为10.06 mm。对比其他现有的有限差分模型,考虑能量耗散的横观各向同性模型计算结果与实际监测值最接近,可以反映不同开挖步时围岩内部关键点位移的变化趋势。因此,在高地应力地区地下洞室开挖时,可使用该模型对洞周围岩的劈裂区进行预测与分析,并参考计算结果对关键区域加强监测与管理,从而减小围岩劈裂破坏对洞室稳定性的影响。
Abstract:In the construction of deep buried underground cavern,the surrounding rock masses of underground caverns are prone to appear splitting failure due to the high in-situ stress and the brittleness of rock mass.In this study,based on the energy dissipation principle and a transversely isotropic model,a kind of new custom transverse isotropic calculation model is estabilished which is judged by the splitting failure criterion of model element stress state,and the stability of excavation of large underground caverns in Dagangshan hydropower station is evaluated based on this new custom model.Besides,the displacement and the entire process of rock splitting failure of each excavation steps of the main house have been achieved through field monitoring on side walls of the construction site of large-scale caverns in Dagangshan.Then,the results of field monitoring are compared with the calculated results of the stability analysis of different constitutive models,and the following conclusions are obtained:during the excavation of the Dagangshan Hydropower Station underground caverns,the average depth of splitting zone of the sidewall in the main power house calculatedby the new model is quite consistent with the field monitoring result; compared with other models,the new model is better to reflect the change trend of surrounding rock displacement between the main power house and the main transformer chamber.According to the results of the stability analysis,the key point displacement of the downstream side wall and the position near the crane beam of the main power house is larger,the maximum horizontal displacement of the sidewall is 29.46 mm.The vault displacement of the main powerhouse is larger in the initial stage of excavation,and the maximum vertical displacement of the vault is 10.58 mm.The results show that,compared with other existing FDTD model,calculation results by the new custom model is closer to the actual monitoring value,which reflects the displacement of the surrounding rock mass in different excavation steps and the change trend of the surrounding rock displacements of the key points.This new model is reasonable to calculate and predict the splitting zone of the surrounding rock when the underground cavity in high geostrese areas during excavation and is also appropriate to the stability analysis on the surrounding rock after excavation.or Referring to the strengthen the monitoring and management of key areas,our proposed model is beneficial for reducing the splitting failure effect on tunnel stability.
文章编号:201700418     中图分类号:O319.56    文献标志码:
基金项目:国家科技支撑计划资助项目(2015BAB07B05);国家自然科学基金资助项目(51379112);山东大学基本科研业务费专项资金资助项目(2015JX003)
作者简介:王知深(1987-),男,博士生.研究方向:岩石力学数值模拟.E-mail:ashenlittle@126.com
引用文本:
王知深,李勇,朱维申,薛翊国,虞松,王旌,董振兴.高地应力地区围岩劈裂破坏现场监测和能量耗散模型及应用[J].工程科学与技术,2018,50(2):50-59.
WANG Zhishen,LI Yong,ZHU Weishen,XUE Yiguo,YU Song,WANG Jing,DONG Zhenxing.Splitting Failure on Side Walls of Underground Cavern in High In-situ Stress Area and Applications of an Energy Dissipation Model[J].Advanced Engineering Sciences,2018,50(2):50-59.