超前预固结灌浆调压井施工期围岩稳定的影响研究  

Study of surrounding rock stability during construction of surge shaft with advance pre-consolidation grouting

作　　者：王晨辉 WANG Chen-hui(Xinjiang Jianyuan Construction Co.,Ltd.,Urumqi 830000,China)

机构地区：[1]新疆建源工程有限公司,乌鲁木齐830000

出　　处：《广西水利水电》2022年第1期79-82,共4页Guangxi Water Resources & Hydropower Engineering

摘　　要：结合工程实例,针对复杂地质情况下的大尺寸调压井,采用理想弹塑性材料本构关系及D-P屈服准则建立三维有限元模型,研究调压井施工期围岩的稳定性。分析各方案下分步开挖过程对围岩稳定性的影响,了解围岩应力变形分布特征、塑性区发展状况。通过研究对Ⅳ~Ⅴ类围岩超前预固结灌浆后开挖成井,不采取任何支护措施,固结灌浆影响范围为开挖边线外7 m的方式。分析计算结果表明,对于地质条件复杂、规模较大的调压井工程,施工过程中单纯的支护不足以维持围岩的稳定,需采用灌浆手段控制围岩的变形量与塑性区发展范围,减小对支护的要求。Combined with actual project,in view of the large size surge shaft under complicated geological condi⁃tions,3D finite element model was established by constitutive relation of ideal elastoplastic material and D-P yield criterion to study the surrounding rock stability of surge shaft during construction period.The author analyzed the impact of step excavation process of various schemes on the surrounding rock stability,so as to find out the stress and deformation distribution characteristics as well as the plastic zone development of surrounding rock.The author also studied surge shaft excavation without any supporting measures and within surrounding rock of IV~V class after advance pre-consolidation grouting with the influence scope of consolidation being 7m outside the excavating boundary.The results of study demonstrate that for a large size surge shaft under complicated geological conditions,simple supports is not able to keep the surrounding rock stability during construction;grouting is required to control the deformation of surrounding rock and development of plastic zone,so as to reduce the demands for supports.

关 键 词：调压井 围岩稳定 弹塑性材料 固结灌浆 

分 类 号：TV732.51[水利工程—水利水电工程]