汾河二库坝基岩体张扭性结构面的工程地质特性及工程处理  

Engineering Geological Properties of Tenso-shear Structural Planes of Rock Mass of Fenhe Ⅱ Reservoir Dam and Treatment Measures to Them

作　　者：白滨[1] 

机构地区：[1]山西省水利水电勘测设计研究院,山西太原030024

出　　处：《水利与建筑工程学报》2010年第5期54-56,共3页Journal of Water Resources and Architectural Engineering

摘　　要：工程坝基施工开挖过程中发现岩体中发育多组张扭性结构面,使坝基岩体质量降低,为此参考勘察时地质资料、坝基施工开挖编录的地质资料等分析认为,这些具张扭性特征的结构面,是区域性剥蚀和河流深切所产生由垂向卸荷引起的河谷底部岩体应力集中所形成的浅生构造。通过现场测试和室内岩石试验,对坝基岩体中张扭性结构面的工程地质性质进行研究,这些张扭性结构面使坝基岩体结构松弛、强度降低、渗透性增强等,严重影响了坝基岩体质量,对坝基岩体稳定产生不利影响,并采取了合理的工程处理措施。In the construction and excavation process of the dam foundation of Fenhe Ⅱ Reservoir,it is found that the multiple tenso-shear structural planes are developed in the rock mass,which are considered as the epigenetic structures caused by vertical unloading in river bottom with reference to the geological data from investigation and construction.Through field tests and indoor rock tests,the engineering geological properties of the tenso-shear structural planes are studied,it is found that these tenso-shear structural planes led to the structure relaxation,strength reduction,permeability increasing and so on of rock mass of the dam foundation,which would seriously affect the rock mass quality and stability of the dam foundation.At last,some reasonable treatment measures are adopted according to these problems.

关 键 词：垂向卸荷 张扭性结构面 浅生构造 工程处理 

分 类 号：TV223.34[水利工程—水工结构工程]