地下厂房洞室群施工期围岩变形及破坏特征分析

发布时间：2018-04-10 06:13

本文选题：地下厂房洞室群　切入点：围岩变形　出处：《地下空间与工程学报》2015年S2期

【摘要】：简要介绍了锦屏一级水电站地下厂房洞室群的工程地质条件、施工期安全监测方法。对围岩变形监测成果进行了统计分析,对围岩变形规律及特点进行了研究。结合施工开挖及地质条件,对围岩变形过程、时效行进行了探讨。经过分析认为厂房地下洞室群围岩变形破坏机理复杂,与岩体强度、应力场分布、岩体工程地质特性、洞室群规模和形状、开挖方式、支护时机和强度等多种因素有关,其中地应力高的大理岩岩体强度相对较低是施工期围岩变形破坏的主要原因。提出了增加开挖层数、减少开挖层高、相邻洞室错层开挖、增加对穿锚索及降低锚索锁定初值等建议措施。
[Abstract]:This paper briefly introduces the engineering geological conditions and safety monitoring methods of underground powerhouse caverns of Jinping I Hydropower Station.The monitoring results of surrounding rock deformation are statistically analyzed, and the law and characteristics of surrounding rock deformation are studied.Combined with construction excavation and geological conditions, the deformation process and aging line of surrounding rock are discussed.It is considered that the deformation and failure mechanism of surrounding rock mass of underground cavern group of workshop is complex, which is related to many factors, such as rock mass strength, stress field distribution, rock mass engineering geological characteristics, size and shape of cavern group, excavation mode, supporting opportunity and strength, etc.The relatively low strength of marble rock mass with high ground stress is the main reason of surrounding rock deformation and failure during construction.Some measures such as increasing the number of excavation layers, reducing the height of the excavation layer, excavating the adjacent cavern staggered layer, increasing the number of anchor cables and reducing the initial value of anchor cable locking are put forward.
【作者单位】：长江科学院工程质量检测中心;中国水电工程顾问集团公司中南勘测设计研究院;
【基金】：中央级公益性科研院所基本科研业务费资助项目(2010-2-8)
【分类号】：TV731.6;TV223

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