压实高庙子膨润土力学特性各向异性研究进展

doi:10.3724/1000-6915.jrme.2025.0403

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Abstract The primary mineral component of bentonite is montmorillonite. The layered structure of montmorillonite causes the long axes of bentonite particles to align directionally during uniaxial static compaction into blocks, resulting in compaction-induced mechanical anisotropy. This paper systematically reviews the research progress on anisotropy in relation to swelling pressure, swelling/shrinkage deformation, compressibility, and strength characteristics, using Gaomiaozi bentonite as a case study. The findings indicate that swelling anisotropy is linked to the oriented swelling of montmorillonite crystal layers and the rearrangement of montmorillonite particles. An increase in dry density enhances the former, while higher salt concentrations suppress both mechanisms. Additionally, increased moisture content promotes structural homogenization of compacted bentonite. During loading, specimens with vertical compaction planes are more prone to particle slippage compared to those with horizontal planes, which results in reduced yield stress. Under high stress levels, initial anisotropy may diminish, while secondary anisotropy may emerge. Tensile strength is greater when tensile force is applied parallel to the crystal layer plane, and specimens with vertical compaction planes exhibit higher shear strength than those with horizontal planes. Future research should focus on the orientation of soil particles and other microstructural features, the development of predictive models for anisotropy under multi-factor coupling, in-situ testing in underground laboratories, and the behavior and evolutionary mechanisms of bentonite barriers under coupled thermos-hydro-mechanical-chemical (THMC) processes.

Key words： soil mechanics GMZ bentonite anisotropy swelling pressure swelling/shrinking deformation compression strength

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	Articles by authors
	YE Weimin1
	2*
	ZENG Caiyun1
	LU Puhuai1
	LU Yu1
	WANG Qiong1
	CHEN Yonggui1

Cite this article:

YE Weimin1,2*,ZENG Caiyun1, et al. Advances on anisotropy of the mechanical properties of compacted Gaomiaozi bentonite[J]. , 2026, 45(6): 1842-1853.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0403 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I6/1842

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