混合岩化片岩岩体变形参数试验研究
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摘要
混合岩化片岩具有各向异性,对工程基础稳定性影响极大。为了研究曲溪地区混合岩化片岩岩体的变形特征,了解岩体的变形参数,通过现场刚性承压板法试验,获得了坝址选区内混合岩化片岩微风化带岩体的弹性参数E_S=12.60 GPa,E_0=7.78 GPa;弱—微风化带岩体的弹性参数E_S=1.67 GPa,E_0=0.89 GPa,结合试验所得的Ⅰ型、Ⅱ型、Ⅲ型三种压力(P)—变形(W_0)关系曲线,对重力坝址区混合岩化片岩体变形进行分析。坝址区内混合岩化片岩的变形,属于岩体内部孔隙和层理受压所致,且变形范围不影响混凝土重力坝的建设。
Migmatized schist rock has anisotropy,a great impact on the stability of the engineering foundation. In order to study the deformation characteristics of the migmatized schist in the Quxi area and to understand the deformation parameters of the rock mass,the elastic parameters E_S of the rock mass in the micro-weathering zone of the migmatized schist in the dam site were obtained by the onsite rigid bearing plate method,i.e. E_S= 12.60 GPa,E_0= 7.78 GPa. The parameters of weak-micro weathered migmatization schist is E_S= 1.67 GPa,E_0= 0.89 GPa. The obtained three types of pressure( P) vs deformation( W_0) curves type Ⅰ,type Ⅱ and Ⅲ were applied to analyze the deformation of the rock mass in the dam area. The results show that the deformation of the migmatizition schist in study area is mainly due to the compress of the structural fracture and bedding caused by the pressure while the deformation scope does not affect the concrete construction of the dam. The proposed site meets the construction conditions of concrete gravity dam.
Migmatized schist rock has anisotropy,a great impact on the stability of the engineering foundation. In order to study the deformation characteristics of the migmatized schist in the Quxi area and to understand the deformation parameters of the rock mass,the elastic parameters E_S of the rock mass in the micro-weathering zone of the migmatized schist in the dam site were obtained by the onsite rigid bearing plate method,i.e. E_S= 12.60 GPa,E_0= 7.78 GPa. The parameters of weak-micro weathered migmatization schist is E_S= 1.67 GPa,E_0= 0.89 GPa. The obtained three types of pressure( P) vs deformation( W_0) curves type Ⅰ,type Ⅱ and Ⅲ were applied to analyze the deformation of the rock mass in the dam area. The results show that the deformation of the migmatizition schist in study area is mainly due to the compress of the structural fracture and bedding caused by the pressure while the deformation scope does not affect the concrete construction of the dam. The proposed site meets the construction conditions of concrete gravity dam.
引文
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[2]刘彬.软硬相间层状岩体变形参数理论研究及工程应用[D].成都:成都理工大学,2006.
[3]张占荣,杨艳霜,赵新益,等.岩体变形参数确定的经验方法研究[J].岩石力学与工程学报,2016,35(S1):3195-3202.
[4]甘肃省水利水电勘测设计研究院.天水曲溪城乡供水工程现场岩体变形试验报告[R].兰州:甘肃省水利水电勘测设计研究院,2015.
[5]杜磊.云母角闪片岩变形特征参数试验研究[J].甘肃水利水电技术,2016,52(9):21-23.
[6]凡远行,谢红强,卓莉,等.基于现场承压板试验的岩体变形参数及修正方法[J].四川大学学报(工程科学版),2015,47(S2):61-66.
[7]罗传毅.确定取舍离群值的简便方法[J].吉林化工学院学报,1987,4(3):24-28.
[8]王毅,聂德新,张景科,等.岩体裂隙化程度与岩体变形参数的关系研究[J].岩石力学与工程学报,2003,22(S2):2572-2574.
[9]中华人民共和国国家经济贸易委员会.混凝土重力坝设计规范:DL 5108—1999[S].北京:中国电力出版社,2000.
[10]中华人民共和国水利部.水利水电工程地质勘查规范:GB 50287—1999[S].北京:中国计划出版社,1999.