岩体结构面抗剪强度尺寸效应联合试验系统及初级应用研究

doi:10.13722/j.cnki.jrme.2020.1215

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摘要岩体结构面抗剪强度尺寸效应及其机制是岩石力学及工程地质等相关领域研究的基本问题。目前国内外无成型的可用于大范围系列尺度试样直剪试验的仪器，使得岩体结构面抗剪强度尺寸效应研究进展缓慢。为此，开发岩体结构面抗剪强度尺寸效应联合试验系统与技术，采用多尺度结构面试样快捷切换、荷载测控系统分级和重叠试样等效性校验、测试过程动态检测及结构面剪损测量等关键技术和方法，为结构面抗剪强度尺寸效应等关键科学问题研究提供基础试验支撑平台。该试验系统以两级直剪设备联合试验的初步应用表明：能满足10 cm×10 cm～100 cm×100 cm相差100倍的岩体结构面试样自动切换问题，涉及系列多尺度试样的输送、定位、加载、复位等工作流程；能满足荷载值范围从2～1 000 kN相差500倍的测控系统精度和稳定性，检测机构鉴定试验系统精度等级达到0.5级，通过对30 cm×30 cm和40 cm×40 cm重叠试样在两级直剪设备的抗剪强度试验结果对比，结果表明两者的衔接性良好；通过对相同结构面尺寸的试样在不同载荷条件时的抗剪强度测试，结果表明切向荷载峰值与施加的法向载荷相关；通过对不同结构面尺寸的试样在相同载荷条件时的抗剪强度测试，结果表明切向荷载峰值/法向载荷的比值总体变化趋势稳定，但在某一结构面尺寸范围内出现小幅波动。

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	杜时贵1
	吕原君1
	罗战友2
	黄曼3

关键词 ：岩石力学, 岩体结构面, 抗剪强度, 尺寸效应, 同精度

Abstract：The size effect of rock joint shear strength is a basic research issue in the field of rock mechanics and engineering geology. Due to the lack of mature direct shear test equipment on series size specimens at home and abroad，the research process on shear strength size effect of rock joints is slow. In this paper，a shear strength size effect direct shear combined test system of rock joints is developed，and the key technologies and methods are put forward such as fast conversion of multi-scale jointed specimens，classification of load measurement and control system，equivalence check of overlapping specimens，dynamic detection in testing process and shear loss measurement of structural planes，providing a basis experimental support platform for investigating the size effect of rock joint shear strength and other key scientific issues. The preliminary application results of the developed test system are demonstrated by two-level direct shear apparatus. It is shown that the test system can solve the problem of automatic transformation of specimens in the range of 100 times of the rock joint size from 10 cm×10 cm to 100 cm×100 cm，involving the process of transporting，positioning，loading and resetting of multi-scale specimens. The test system can also solve the problem of accuracy and stability of the measurement control system in the range of 500 times of the load from 2 kN to 1 000 kN. The accuracy level of the test system reaches 0.5 through the identification of a testing organization. The shear strength test results of overlapped specimens of 30 cm×30 cm and 40 cm×40 cm in two-level direct shear apparatus are compared，which shows that the convergence of the two sizes of samples is good. For the specimens with the same structural plane sizes under different loads，the peak values of the tangential load are related to the applied normal loads. For the specimens with different structural plane sizes under the same load，however，the ratio of the tangential load peak value to the normal load has a stable trend，except for a slight fluctuation in a certain size range of the structural plane.

Key words： rock mechanics rock joint shear strength size effect equal precision

引用本文:

杜时贵1，吕原君1，罗战友2，黄曼3. 岩体结构面抗剪强度尺寸效应联合试验系统及初级应用研究[J]. 岩石力学与工程学报, 2021, 40(7): 1337-1349.
DU Shigui1，LYU Yuanjun1，LUO Zhanyou2，HUANG Man3. Combined test system for size effect of rock joint shear strength and its primary application research. , 2021, 40(7): 1337-1349.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.1215 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I7/1337

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