基于单试件法的节理岩体抗剪强度参数分析

邓华锋; 熊雨; 肖瑶; 齐豫; 李涛; 许晓亮

doi:10.11779/CJGE202008016

基于单试件法的节理岩体抗剪强度参数分析 English Version

三峡库区地质灾害教育部重点实验室(三峡大学),湖北　宜昌　443002

基金项目:

国家自然科学基金项目 51679127

国家自然科学基金项目 51439003

湖北省科技创新专项（重大项目） 2017ACA189

三峡库区地质灾害教育部重点实验室（三峡大学）开放研究基金项目 2018KDZ04

详细信息

作者简介:
邓华锋(1979—),男,博士,教授,主要从岩土工程方面的教学与研究工作。E-mail：dhf8010@ctgu.edu.cn

通讯作者:
许晓亮, E-mail：sichuan106@163.com

中图分类号: TU43
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出版历程
- 收稿日期: 2019-09-01
- 网络出版日期: 2022-12-05
- 刊出日期: 2020-07-31

Shear strength parameters of jointed rock mass based on single test sample method

Key Laboratory of Geological Hazards on Three Gorges Reservoir Area (China Three Gorges University), Ministry of Education, Yichang 443002, China

摘要

摘要: 试样之间的差异不仅影响节理岩体直剪试验结果的离散性,更重要的是影响节理岩体“多试件法”抗剪强度参数分析结果的合理性,为此,采用劈裂法制备了单节理砂岩试样,进行了节理面形貌扫描分析和直剪试验。研究结果表明：①由于制样条件限制,试样之间的差异不可避免,试样的非均匀性导致了试验结果的离散,使得试样使用顺序直接影响试验结果的分布规律；②基于Barton建立的节理面抗剪强度经验公式,提出了通过单个试样节理面形貌特征扫描分析或者单次直剪试验确定该试样节理面JRC值和抗剪强度参数的“单试件法”,为定量分析同组各试样之间抗剪强度参数差异提供了较好的思路；③提出了基于“单试件法”的节理岩体抗剪强度参数综合分析方法,将同组各试样在不同法向应力下的抗剪强度试验值和计算值一起进行拟合分析,使得每个试样在不同法向应力下的剪切力学特性都有体现,可以更加真实地反映该组试样节理面的剪切力学特性分布规律,而且可以消除试样使用顺序对试验结果的影响。
- 节理岩体 /
- 节理面 /
- 形貌 /
- 差异 /
- 试验顺序 /
- 分形维数 /
- 单试件法
Abstract: The difference between the samples affects the discreteness of the direct shear test results and more importantly the rationality of the analysis results of the shear strength parameters of the multiple test sample method of jointed rock mass. For this reason, the single-joint sandstone samples are prepared by using the splitting method, and the joint surface morphology scanning analysis and direct shear tests are carried out. The results indicate that: (1) Due to the limitation of the sample preparation conditions, the difference between the samples is unavoidable. The non-uniformity of the samples leads to the discreteness of the test results, so that the order of use of the samples directly affects the distribution of the test results. (2) Based on the empirical formula for the shear strength of joint surfaces established by Barton, a single test sample method is proposed to determine the JRC and shear strength parameters of the joint surface of the samples through the scanning analysis of topography of single sample joint surface or single direct shear test, so as to provide a better idea for quantitative analysis of the difference in shear strength parameters between the same sample. (3) A comprehensive analysis method for the shear strength of jointed rock mass based on the single sample method is proposed. The shear strength test values and calculated values of the same set of samples under different normal stresses are fitted together, so that the shear mechanical properties of the samples under different normal stresses are reflected. It can more accurately reflect the distribution of shear mechanical properties of the joint surface of the samples, and can eliminate the influences of the order of use of the samples on the test results.
- jointed rock mass /
- joint surface /
- topography /
- difference /
- test sequence /
- fractal dimension /
- single test sample method

HTML全文

图 1 典型单节理试样

Figure 1. Typical single joint sample

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图 2 YZW 1000型微机控制电动直剪仪

Figure 2. YZW 1000 microcomputer control electric straight shear instrument

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图 3 ST500三维非接触式表面轮廓仪

Figure 3. ST500 three-dimensional non-contact surface profiler

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图 4 典型节理面微观形貌扫描图

Figure 4. Scanning microtopography of typical joint surface

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图 5 节理面微观形貌分析网格图

Figure 5. Micromorphology analysis grids of joint surface

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图 6 典型试样节理面x,y方向剖面轮廓线

Figure 6. Profiles of joint surface of typical samples in x and y directions

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图 7 节理面抗剪强度拟合分析结果

Figure 7. Fitting results of shear strength of joint surface

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图 8 节理面抗剪强度参数拟合分析

Figure 8. Fitting analysis of shear strength parameters of joint surface

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表 1 典型试样节理面各剖面线分形维数

Table 1 Fractal dimensions of section lines of joint surface typical samples

剖面线序号	0	1	2	3	4	5	6	7	8	9	10	均值	标准差
D_xi	1.25	1.04	1.07	1.07	1.02	1.04	1.03	1.14	1.09	1.12	1.05	1.08	0.07
D_yi	1.04	1.09	1.16	1.20	1.02	1.22	1.46	1.02	1.08	1.02	1.10	1.13	0.13

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表 2 各试样节理面x,y方向分形维数均值

Table 2 Mean values of fractal dimension in x and y directions of joint surface of samples

编号	法向应力/MPa	x方向分形维数均值 ${\bar{D}}_{x}$	y方向分形维数均值 ${\bar{D}}_{y}$	抗剪强度试验值/MPa
S_1.0-1	1.0	1.08	1.13	1.05
S_1.0-2		1.08	1.18	1.15
S_1.0-3		1.20	1.06	1.23
S_1.5-1	1.5	1.03	1.07	1.36
S_1.5-2		1.15	1.03	1.56
S_1.5-3		1.06	1.20	1.61
S_2.0-1	2.0	1.07	1.03	1.76
S_2.0-2		1.08	1.10	1.88
S_2.0-3		1.12	1.30	2.31
S_2.5-1	2.5	1.19	1.09	2.56
S_2.5-2		1.24	1.10	2.88
S_2.5-3		1.12	1.36	2.71

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表 3 节理面抗剪强度试验值和计算值

Table 3 Test and calculated values of shear strength of joint surface

编号	法向应力/MPa	抗剪强度试验值/MPa	x方向分形维数均值 ${\bar{D}}_{x}$	粗糙度系数JRC	抗剪强度计算值/MPa	误差/%
S_1.0-1	1.0	1.05	1.08	9.18	1.03	-1.63
S_1.0-2		1.15	1.08	9.18	1.02	-11.19
S_1.0-3		1.23	1.20	14.00	1.37	11.01
S_1.5-1	1.5	1.36	1.03	5.85	1.21	-10.98
S_1.5-2		1.56	1.15	12.26	1.71	9.36
S_1.5-3		1.61	1.06	8.05	1.36	-15.37
S_2.0-1	2.0	1.76	1.07	8.64	1.81	2.58
S_2.0-2		1.88	1.08	9.18	1.85	-1.36
S_2.0-3		2.31	1.12	11.07	2.03	-11.98
S_2.5-1	2.5	2.56	1.19	13.67	2.76	7.65
S_2.5-2		2.88	1.24	15.22	2.96	2.74
S_2.5-3		2.71	1.12	11.07	2.45	-9.67

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表 4 节理面抗剪强度参数拟合分析结果

Table 4 Fitting results of strength parameters of joint surface shear

编号	法向应力/MPa	抗剪强度试验值/MPa	粗糙度系数JRC计算值	黏聚力/MPa	摩擦角/(°)
S_1.0-1	1.0	1.05	9.65	0.23	39.71
S_1.0-2		1.15	11.18	0.29	41.15
S_1.0-3		1.23	12.29	0.37	42.16
S_1.5-1	1.5	1.36	8.01	0.18	38.12
S_1.5-2		1.56	10.59	0.26	40.60
S_1.5-3		1.61	11.18	0.29	41.15
S_2.0-1	2.0	1.76	8.12	0.18	38.23
S_2.0-2		1.88	9.46	0.22	39.53
S_2.0-3		2.31	13.67	0.41	43.39
S_2.5-1	2.5	2.56	12.05	0.33	41.95
S_2.5-2		2.88	13.30	0.39	43.06
S_2.5-3		2.71	14.63	0.46	44.20

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表 5 节理面抗剪强度参数拟合分析结果

Table 5 Fitting results of joint strength parameters of surface shear

分析方法	黏聚力/MPa	摩擦角/(°)
极值Ⅰ	0.98	23.13
极值Ⅱ	-0.33	52.13
“多试件法”	0.02	46.11
“单试件法”确定各试样的均值	0.30	41.10
基于“单试件法”的综合分析方法	0.30	41.16

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