防灾减灾工程学报2017，Vol.37Issue(4)：636-643,8.DOI:10.13409/j.cnki.jdpme.2017.04.019
高拱坝坝肩软弱结构面HM耦合效应试验研究
Experimental Study on HM Coupling Effect of Weak Structural Planes for High Arch Dam Abutment
摘要
Abstract
In order to quantitatively reveal the hydro-mechanical(HM) coupling effect of the weak structural planes in the dam abutment after a high arch dam project put into operation,the dam abutment rock samples of main faults of Jinping I high arch dam were collected,and the specimens were prepared by using remolding method,then a series of triaxial compression tests were performed on the replica specimens under hydrostatic pressures of 0,1,2,3 and 4 MPa in the MTS Rock Mechanics Testing System.The results show that the strength parameters of Jinping I arch dam abutment faults material have significant hydraulic pressure weakening effect,the friction coefficient f changes a little when the water pressure increases,the average weakening rate is less than 7 ％,while the cohesion c significantly decreases when the water pressure increases and the maximum weakening rate is up to 100％.Considering the combined effect of strength parameters f and c,the average weakening rate of the anti-shear strength τ of the main faults is around 25％ under engineering condition of 3MPa water pressure and10 MPa normal stress.A prediction model of structural plane strength parameters under different water osmotic pressures was established,and according to the effective stress principle,the weakening rule and mechanism of shear strength of structural plane were analyzed preliminarily.The test results have been applied in the dam abutment stability study of the Jinping I high arch dam,and the research methods can provide the reference for the research of the mechanical properties of weak structure plane under multi-field coupling condition.关键词
高拱坝工程/坝肩软弱结构面/HM耦合作用/强度弱化效应/试验研究Key words
high arch dam project/weak structural plane of dam abutment/multi-field coupling/strength weakening effect/experimental study分类
建筑与水利引用本文复制引用
杨宝全,张林,陈媛,陈建叶,董建华,刘恩龙..高拱坝坝肩软弱结构面HM耦合效应试验研究[J].防灾减灾工程学报,2017,37(4):636-643,8.基金项目
国家自然科学基金项目(51609163 （）
51409179 （）
51379139)、国家重点研发项目(2016YFC0401908)资助 （2016YFC0401908）
