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| 1 | Acoustic emission monitoring of rockbursts during TBM-excavated headrace tunneling at Jinping Ⅱ hydropower station显示文摘To better understand the mechanical properties of marble at Jinping II hydropower station, this paper examines the changes of brittle rocks in excavation damaged zones(EDZs) before and after excavation of tunnel with the tunnel boring machine(TBM). The paper attempts to employ the acoustic emission(AE) to study the AE characteristics and distribution of rockburst before and after TBM-excavated tunnel. It is known that the headrace tunnel #2, excavated by the drill-and-blast(D&B) method, is ahead of the headrace tunnel #3 that is excavated by TBM method. The experimental sub-tunnel #2–1, about 2000 m in depth and 13 m in diameter, between the two tunnels is scheduled. In the experimental sub-tunnel #2–1, a large number of experimental boreholes are arranged, and AE sensors are installed within 10 m apart from the wall of the headrace tunnel #3. By tracking the microseismic signals in rocks, the location, frequency, quantity, scope and intensity of the microseismic signals are basically identifed. It is observed that the AE signals mainly occur within 5 m around the rock wall, basically lasting for one day before tunnel excavation and a week after excavation. Monitoring results indicate that the rockburst signals are closely related to rock stress adjustment. The rock structure has a rapid self-adjustment capacity before and after a certain period of time during tunneling. The variations of rock stresses would last for a long time before reaching a fnal steady state. Based on this, the site-specifc support parameters for the deep tunnels can be accordingly optimized. | Wuwei Cheng Wenyou Wang Shiqiang Huang Peng Ma | 2013 | Journal of Rock Mechanics and Geotechnical Engineering2013，5，6： | 6 |
| 2 | 高地应力下花岗质片麻岩蠕变损伤模型研究显示文摘高海拔地区深埋隧道的花岗质片麻岩在高地应力条件下具有较强的蠕变力学特性,易导致隧道结构开裂,对结构的安全性和耐久性影响较大。在花岗质片麻岩基本力学特性试验的基础上,对其开展了高围压下的三轴蠕变试验。研究表明:随着围压的增大,轴向蠕变量减小显著,环向蠕变量受影响较小;不同围压下的加速蠕变阶段,环向蠕变效应均比轴向更显著;破裂面倾角随围压的增大逐渐减小。基于蠕变试验结果,分析了花岗质片麻岩的损伤演化规律,提出了指数型损伤变量,将传统Burgers蠕变模型改进为能够描述加速蠕变段的全损伤蠕变模型,并推导了一维和三维蠕变损伤方程,利用加速蠕变阶段的试验数据对模型进行了参数识别,拟合效果较好。 | 钟祖良 王南云 任玉琪 李洋 | 2021 | 地下空间与工程学报2021，17，3： | 2 |
| 3 | 高地应力条件下深部砂岩三轴蠕变特性及本构模型显示文摘大量的工程建设项目存在高陡岩质边坡,在高应力环境下,岩石的蠕变特性是评价边坡长期稳定性的关键指标。为探讨深层高应力条件下岩石的蠕变特性,本文采用分级加载的方式对高陡岩质边坡深部砂岩进行三轴蠕变实验。研究表明,在高应力环境下,硬岩也呈现出典型的蠕变特性,基于损伤理论,引入一个非线性黏塑性体元件,提出一种改进的Burgers模型来描述深部砂岩的蠕变本构特性。通过数据拟合对比,验证改进的Burgers模型的正确性和适用性。研究结果为高地应力条件下的工程建设提供了有效的基础资料和参考依据。 | 李延福 段顺荣 张地 谭维佳 | 2022 | 科技通报2022，38，2： | 2 |
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