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| 1 | Rock mechanics contributions to recent hydroelectric developments in China显示文摘Rock mechanics plays a critical role in the design and construction of hydroelectric projects including large caverns under high in situ stress,deep tunnels with overburden more than 2500 m,and excavated rock slopes of 700 m in height.For this,this paper conducts a review on the rock mechanics contributions to recent hydroelectric developments in China.It includes the development of new testing facilities,mechanical models,recognition methods for mechanical parameters of rock masses,design flowchart and modeling approaches,cracking-restraint method,governing flowchart of rock engineering risk factors enabling the development of risk-reduced design and risk-reduced construction,and initial and dynamic design methods.As an example,the optimal design of underground powerhouses at the Baihetan hydroelectric plant,China,is given.This includes determination of in situ stresses,prediction of deformation and failure depth of surrounding rock masses,development of the optimal excavation scheme and support design.In situ monitoring results of the displacements and excavation damaged zones(EDZs)have verified the rationality of the design methodology. | Xia-Ting Feng Yang-Yi Zhou Quan Jiang | 2019 | Journal of Rock Mechanics and Geotechnical Engineering2019，11，3： | 6 |
| 2 | 基于应力-时间双阈值条件的岩石黏弹塑性蠕变模型显示文摘针对传统蠕变模型在衰减蠕变阶段拟合精度不高、无法刻画加速蠕变阶段非线性特征的不足,根据岩石流变试验中黏性系数在不同应力水平和不同蠕变阶段中的变化规律,建立了2种黏性系数随应力水平和时间变化的黏性元件N_(1)、N_(2),将N_(1)替换饱依丁-汤姆逊体中的黏性元件,将N_(2)与包含应力阈值和时间阈值双开关的塑性元件组合得到一个新的黏塑性元件,将其与改进后的饱依丁-汤姆逊体串联,得到一种新的岩石非线性黏弹塑性五元件蠕变模型,并推导至三维应力状态。对提出的蠕变模型进行稳定性及模型参数敏感性分析,从理论上证明了模型的合理性和科学性。阐述了模型各参数的求解方法。基于岩石加速蠕变阶段应变-时间曲线的特点,研究了加速蠕变阶段启动时间的确定方法。采用该模型对工程现场大尺寸软岩压缩流变试验和室内小尺寸饱水硬岩剪切流变试验数据进行拟合验算,计算结果的相关性系数均在0.95以上,说明拟合效果较好,验证了该模型的正确性和适用性。结果表明:根据流变试验各阶段岩石黏性系数随应力及时间的变化规律,采用流变力学理论构建的黏弹塑性蠕变模型物理意义明确,应力、时间双阈值条件下拟合得到的模型参数更准确,能更好地刻画岩石加速蠕变阶段的非线性特征。 | 崔阿能 胡斌 崔凯 刘杨 李京 | 2022 | 公路交通科技2022，39，2： | 1 |
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