中尺寸岩样真三轴试验系统研制与应用

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摘要目前国内外岩石真三轴试样尺寸倾向于两极，且尺寸跨度大、应力大小不同，不便于研究岩体三轴强度的尺寸效应和高应力环境复杂应力路径岩石的变形与强度特征，为了解决这个问题，研制LWZ–10000型中尺寸岩石真三轴试验系统，详细介绍该系统的设计思路、结构特点、技术指标及功能，该系统具有以下特点：(1) 自动伺服控制与变形破坏全过程数据采集，且精度高、性能稳定；(2) 试样尺寸介于室内和现场三轴试样尺寸之间，且尺寸可变；(3) 侧向和轴向载荷高，且三向独立控制；(4) 可同步进行超声波和声发射跟踪测试。采用该系统对锦屏大理岩进行大量的不同应力路径真三轴试验，对加载和卸载路径真三轴试验的应力–应变全过程曲线及与波速对应关系进行分析，结合大理岩不同尺寸卸载路径的真三轴试验成果，初步研究大理岩卸载路径下强度参数的尺寸效应。该系统的成功研制为研究多向复杂应力路径下不同尺寸深部岩体的变形及强度参数提供了新手段。

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关键词 ：岩石力学, 中尺寸岩样, LWZ&ndash, 10 000型真三轴试验系统, 伺服控制, 自动采集, 深部岩体, 尺寸效应

Abstract：Currently，the dimensions of rock samples used in true triaxial experiment are either too large or too small，the span of dimension is large and magnitudes of stress levels are different，which brings inconvenience to the study of size effect of strength for rock mass in triaxial stressed conditions as well as its deformation and strength characteristics under complex stress path. To cope with this issue，the true triaxial experiment system for middle sized rock samples，named LWZ–10000，is developed. The design concept，composition feature，technical indexes and main function are introduced in detail. The system has such noticeable features as follows：(1) Automatic servo control and data collection during whole process of deformation failure with high precision and stable performance. (2) The dimension of rock samples is between that used in laboratory experiment and in field experiment. Moreover，the dimension can be altered in a certain range. (3) The magnitudes of lateral and axial loads can be large and the magnitudes are controlled independently in three loading directions. (4) Ultrasonic and acoustic emission experiments can be conducted simultaneously. A lot of true triaxial experiments for Jinping marble samples under different stress paths are carried out by the developed system. The whole process stress-strain curves and the relationships with wave speeds in true triaxial experiments under loading and unloading paths are analyzed. Combining with the true triaxial experiment results of different sized marbles under unloading path，the size effect of strength parameters for marble under unloading path is preliminarily studied. The successful development of this system provides new approach to studying the deformation and strength characteristics of deep rock mass considering multidirectional stress state and different stress paths.

Key words： rock mechanics middle sized rock sample LWZ&ndash 10000 true triaxial experiment system servo control automatic collection deep rock mass size effect

收稿日期: 2012-04-20

引用本文:

李维树，黄书岭，丁秀丽，钟作武，邬爱清. 中尺寸岩样真三轴试验系统研制与应用[J]. 岩石力学与工程学报, 2012, 31(11): 2197-2203.
LI Weishu，HUANG Shuling，DING Xiuli，ZHONG Zuowu，WU Aiqing. DEVELOPMENT OF TRUE TRIAXIAL EXPERIMENT SYSTEM FOR MIDDLE SIZED ROCK SAMPLE AND ITS APPLICATIONS. , 2012, 31(11): 2197-2203.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2012/V31/I11/2197

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