考虑渗透吸力影响膨润土的修正有效应力及其验证

doi:10.11779/CJGE201904005

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摘要普遍认为膨润土是高放废物地质处置库缓冲/回填层的理想材料,膨润土在地下水溶液中的膨胀变形和剪切强度关乎高放废物地质处置库的安危。地下水溶液中膨润土膨胀变形和剪切强度受到渗透吸力影响,根据膨润土表面分形模型,建立考虑渗透吸力应力影响的修正有效应力公式,用竖向应力p和渗透吸力π表示为,并采用膨润土在NaCl溶液中的膨胀变形和剪切强度进行验证。NaCl溶液中膨润土的膨胀变形与修正有效应力表示为同一曲线,峰值剪切强度与修正有效应力表示为同一直线,符合Mohr-Coulomb准则。

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	徐永福

关键词 ：渗透吸力, 膨润土, 膨胀变形, 峰值剪切强度, 表面分维, 修正有效应力

Abstract：Bentonite is widely seen as a potential buffer/backfill materials for deeply buried geological disposal system to isolate high-level radioactive waste (HLRW). The swelling deformation and shear strength of the bentonite in saline solutions are very important to the safety of the HLRW depository. A conceptual model is proposed to explain the influences of osmotic suction on the volume change and shear strength of the bentonite in a quantitative way. A new formula for the effective stress is proposed as incorporating with vertical stress (p) and osmotic suction (π), and . The relationship is expressed using a unique curve in the form of for the bentonite in NaCl solutions. The peak shear strength is expressed using a unique curve according to the Mohr-Coulomb criterion for the bentonite in NaCl solutions.

Key words： osmotic suction bentonite swelling deformation peak shear strength surface fractal dimension modified effective stress

收稿日期: 2017-11-21

ZTFLH:

TU443

基金资助:国家自然科学基金重点项目（41630633,41877211）; 安徽省自然科学基金面上项目（1808085MD106）

作者简介: 徐永福(1967- ),男,江苏泰兴人,博士,教授,从事分形介质力学、非饱和（特殊）土力学和地基处理的研究。E-mail: yongfuxu@sjtu.edu.cn。

引用本文:

徐永福. 考虑渗透吸力影响膨润土的修正有效应力及其验证[J]. 岩土工程学报, 2019, 41(4): 631-638. XU Yong-fu. Modified effective stress induced by osmotic suction and its validation in volume change and shear strength of bentonite in saline solutions. Chinese J. Geot. Eng., 2019, 41(4): 631-638.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE201904005 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2019/V41/I4/631

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