长江科学院院报2017，Vol.34Issue(3)：85-89,5.DOI:10.11988/ckyyb.20151059
水岩作用下露天坑边坡岩石蠕变试验分析
Creep Curve of Rock at Open-pit Slope underWater-rock Interaction
摘要
Abstract
In the aim of investigating the long-term effect of water level fluctuation on slope stability, rock samples from Cangshang open-pit slope in Laizhou City were selected for triaxial creep test under different saturation-dehydration cycles.By analyzing creep strain-time curves and creep rate curves of SγJH, the creep properties of slope rock after saturation-dehydration cycles were explored.Furthermore, SγJH rock samples after different cycles were scanned by electron microscopy to analyze the damage mechanism of rock under water-rock interaction in microscopic scale.Results indicate that, 1) along with the increasing of saturation-dehydration cycles, axial creep strain increased up to 31%, and the lateral creep strain increased by 33% under adjacent cycle times;2)instantaneous elastic strain of SγJH-15 improved by 54.3% than that of SγJH-0,creep strain at adjacent load level increased by 24.3% and total creep strain of SγJH reached 80% or above of limit strain in triaxial compression test;3) with the increasing of saturation-dehydration cycles, steady creep rate became nonzero and steady rheological rate of SγJH-15 at the fifth level of loading reached up to 29.2×10-6 h;4)at the moment of applying axial load at all levels,initial creep rate acceleration also increase.In the research field of mechanical properties of rock under water-rock interaction, microscopic weakening and rupture occurs in rock samples under the cycle action due to heterogeneous internal structure of SγJH.Hence the original stress balance is broken, resulting in irregular fluctuations and abrupt change of rock deformation curve.关键词
水岩作用/露天矿坑/岩石力学/蠕变试验/蠕变规律Key words
water-rock interaction/open pit/rock mechanics/creep test/creep law分类
建筑与水利引用本文复制引用
秦哲,付厚利,程卫民,于岩斌..水岩作用下露天坑边坡岩石蠕变试验分析[J].长江科学院院报,2017,34(3):85-89,5.基金项目
国家自然科学基金煤炭联合基金重点项目(U1261205) （U1261205）
国家自然科学基金面上项目(51574158) （51574158）
