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EXPERIMENTAL RESEARCH ON SHEAR CHARACTERISTICS OF MUD-FILLED STRUCTURAL SURFACE UNDER REPEATED SHEARING
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摘要: 结构面的力学特性直接关系工程岩体的变形稳定，而充填物对结构面的力学特性存在较大的影响。为了准确地量化充填前后结构面剪切性能的变化，以三峡库区典型库岸边坡节理岩体为研究对象，采用劈裂法制备了人工节理，按照充填度100%进行考虑，设计进行了充填前、后结构面的重复剪切试验。结果表明：(1)基于重复剪切过程中结构面抗剪性能劣化趋稳的变化规律，提出了一种单试件充填前、后重复剪切的试验方法，并提出了量化分析充填物对结构面影响程度的试验流程和数据处理方法，可以比较准确地确定充填物对结构面抗剪性能的影响；(2)泥质充填后结构面的抗剪性能劣化趋势明显，不同法向应力下的降幅在38.51% ~54.82%之间，而且，法向应力越大，降低幅度越大；(3)在重复剪切过程中，泥质充填结构面的抗剪强度呈现先增大、再减小趋稳的非线性变化规律，主要与剪切过程中泥质充填物的变少、变薄、变光滑，以及结构面出露面积增多、磨损，凹陷位置被岩屑和土填充有关。相关试验方法和思路可为充填结构面剪切性能分析提供较好的参考。Abstract: The mechanical properties of the structural surface affect the stability of the engineering rock mass directly. The filling has a greater impact on the mechanical properties of the structural surface. In order to accurately analyze the effect of filling on the shear performance of structural surface,we prepared the artificial joint samples. We take the joint rock mass of the typical reservoir bank slope in the Three Gorges Reservoir area as the research object. We operate repeated shear tests on structural surfaces before and after filling,according to the filling degree 100%.The results show the following findings. (1)Based on the law of change in the shear resistance of the structural surface during the repeated shearing process,we proposes a method for repeated shearing of single specimen before and after filling. We proposes the experimental procedure and data processing method for analyze the influence of the filling on the structural surface. It can accurately analyze the influence of fillings on the shear resistance of structural surfaces. (2)The shear resistance of the structural surface deteriorates obviously after filling. The drop rate in different normal stresses is between 38.51% ~54.82%. The greater the normal stress,the greater the reduction. (3)During repeated shear,the shear strength of the filling structure surface shows a law of increasing,then decreasing,and stabilizing. It is related to the reduction of the filling material,the expose of the structural surface and the filling of the mud. The related test methods can provide a good reference for the analysis of the shear performance on the filling structure surface
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Key words:
- Filling the structural surface /
- Repeat cut /
- Single specimen method /
- Shear strength /
- Deterioration
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图 1 重复剪切作用下结构面剪应力-剪切变形曲线
Figure 1. Stress-shear deformation curves of structural surface under repeated shear tests
图 5 YZW-1000型微机控制电动直剪仪
Figure 5. YZW-1000 microcomputer controlled electric direct shear instrument
图 6 典型重复剪切下结构面剪应力-剪切位移曲线图
a. 法向应力1.0 MPa; b. 法向应力1.5 MPa; c. 法向应力2.0 MPa; d. 法向应力2.5 MPa
Figure 6. Shear stress-shear displacement curve of structure surface under typical repeated shearing
图 8 充填结构面重复剪切作用下剪应力-剪切位移曲线图
a. 法向应力1.0 MPa；b.法向应力1.5 MPa; c. 法向应力2.0 MPa; d. 法向应力2.5 MPa
Figure 8. Shearing stress-shearing displacement curve diagram under repeated shearing of filling structure surface
图 9 充填前、后结构面抗剪强度变化曲线
Figure 9. Change curve of shear strength of structural surface before and after filling
图 11 1.5 MPa法向应力下结构面形态照片
a. 充填结构面图; b. 1次剪切后; c. 2次剪切后；d. 3次剪切后; e. 4次剪切后; f. 5次剪切后
Figure 11. Schematic diagram of structural surface morphology under 1.5 MPa normal stress
图 12 2.5 MPa法向应力下结构面形态照片
a. 充填结构面; b. 1次剪切后; c. 2次剪切后; d. 3次剪切后; e. 4次剪切后; f. 5次剪切后
Figure 12. Schematic diagram of structural surface morphology under 2.5 MPa normal stress
图 13 充填物与结构面出露面积占比变化图
a. 法向应力1.5 MPa; b. 法向应力2.5 MPa
Figure 13. Changes in the proportion of the exposed area of the filling material and the structural surface
表 1 泥质充填物参数表
Table 1. Parameter table of argillaceous filling
比重
/g·cm-3液限
/%塑限
/%最大干密度
/g·cm-3内摩擦角
/(°)黏聚力
/kPa1.73 28.80 17.23 1.70 21.87 30.55 
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表 2 单次剪切作用下抗剪强度变化值
Table 2. Change value of shear strength under single shear
剪切次数 法向应力/MPa 1.0 1.5 2.0 2.5 1 0.265 0.278 0.578 0.878 2 -0.094 -0.032 -0.119 -0.173 3 -0.036 -0.031 0.116 0.151 4 0.165 0.171 0.016 0.047 5 0.006 0.037 0.021 0.031 正值说明强度降低，负值说明强度上升
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