基质胶结对土石混合体强度变形特性影响

doi:10.13278/j.cnki.jjuese.201504202

摘要/Abstract

摘要：

利用应变控制式静力三轴剪切仪,对具有不同胶结程度和含石量的土石混合体试样进行了固结不排水剪切试验;通过对制备的土石混合体试样的应力-应变关系、孔隙水压力变化、有效应力路径和抗剪强度指标等试验结果的对比分析,探讨了不同胶结程度土石混合体试样的差别及产生原因.试验结果表明:不同胶结程度土石混合体破坏方式可分为剪切带破坏和鼓肚变形破坏两种基本类型;胶结使得土石混合体应力应变关系和孔隙水压力变化与未胶结土石混合体差异明显,胶结作用对土石混合体的剪胀和软化特性影响显著.在块石软硬程度、形状及试样密实度相近的条件下,不论是否胶结或胶结程度如何,土石混合体有效内摩擦角φ'与无量纲粒度分布特征参数D₅₀WBP/D₆₀具有较好的线性相关性.试验结论为确定不同胶结程度土石混合体强度提供了参考.

关键词: 土石混合体, 基质胶结, 固结不排水剪切试验, 含石量

Abstract:

Based on the strain-controlled static tri-axial shear apparatus, the authors conducted a series of consolidation un-drained shear tests on manmade soil-rock mixture (S-RM) with different matrix bonding and block proportion by weight (WBP). The difference of the results with various matrix bonding as well as their causes of the difference were studied by a comparative analysis of the stress-strain relationship, pore pressure, effective stress path, and shear strength parameters. The test results show that the failure models of S-RM with different matrix bonding can be classified as shear band and bulge deformation damage. The different matrix bonding causes a big difference on stress-strain relationship and pore pressure. The matrix bonding strongly affects the mechanical behavior of dilation and the strain-softening of S-RM. The effective internal friction angle φ' of different bonding S-RM has a good liner correlation with the dimensionless parameter D₅₀WBP/D₆₀ under the similar conditions of the hardness,shape of rock, and the density of samples. The conclusions drawn from the test were significant and useful for obtaining the strength of a soil-rock mixture with different matrix bonding.

Key words: soil-rock mixture (S-RM), matrix bonding, consolidation un-drained shear tests, block proportion by weight (WBP)

中图分类号:

TU43

高玮, 胡瑞林. 基质胶结对土石混合体强度变形特性影响[J]. 吉林大学学报(地球科学版), 2015, 45(4): 1164-1172.

Gao Wei, Hu Ruilin. Experimental Research on Strength Characteristics of Soil-Rock Mixture with Different Matrix Bonding[J]. Journal of Jilin University(Earth Science Edition), 2015, 45(4): 1164-1172.

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