混合型缓冲回填材料土水特征曲线测试与修正

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Abstract Both the pressure plate and vapor transfer technique are used to measure the soil-water characteristic curves(SWCCs) of bentonite-sand mixtures for understanding the effects of initial saturated condition，sand mix ratio and dry density on water-holding capacity in drying process. With respect to the bentonite-sand mixtures saturated under confined condition，it is found that the water-holding capacity decreases with the increase in sand mix ratio and dry density. While for the bentonite-sand mixtures saturated under free condition，the water-holding capacity is found to be constant with different dry densities. By introducing the effective clay density and the effective water content，the measured SWCCs of bentonite-sand mixtures are modified to illustrate the major factors controlling the water-holding capacity of mixtures under different saturated conditions. It is found that the water-holding capacity of mixtures saturated under confined condition is mainly controlled by effective clay density；while that saturated under free condition is mainly controlled by sand mix ratio. The empirical equations of modified SWCCs of GMZ001 bentonite-sand mixtures with various sand mix ratios are fitted based on test data，and they can be used to estimate the unsaturated water content of the mixed backfill/buffer material in high-level waste disposal project.

Key words： soil mechanics bentonite-sand mixtures soil-water characteristic curve(SWCC) saturated condition sand mix ratio dry density

Received: 10 September 2010

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/I2/382

[1] 崔素丽，张虎元，梁健，等. 膨润土–砂的膨胀特性与蒙脱石质量比率[J]. 水文地质工程地质，2009，36(4)：95–99.(CUI Suli，ZHANG Huyuan，LIANG Jian，et al. Swelling of bentonite-sand mixture as backfill/buffer material and montmorillonite quality ratio[J]. Hydrogeology and Engineering Geology，2009，36(4)：95–99.(in Chinese)) [2] JOHANNESSON L E. Compaction of full size blocks of bentonite for the KBS-3 concept-initial tests for the evaluating the technique[R]. Swedish：Swedish Meteorological and Hydrological Institute(SMHI)，1999. [3] SUN D A，SUN W J，YAN W，et al. Hydro-mechanical behaviours of highly compacted sand-bentonite mixture[J]. Journal of Rock Mechanics and Geotechnical Engineering，2010，2(1)：79–85. [4] Japan Nuclear Cycle Development Institute. Development and management of the technical knowledge base for the geological disposal of HLW[R]. Ibaraki：Japan Nuclear Cycle Development Institute，2005. [5] 刘月妙，王驹，蔡美峰，等. 高放废物处置库近场热–水–力耦合长期稳定性分析[C]// 第二届废物地下处置学术研究会论文集. 敦煌：[s.n.]，2008：267–274.(LIU Yuemiao，WANG Ju，CAI Meifeng，et al. Long-term stability of the near-field about high-level radioactive waste repository in thermo-hydro-mechanical coupling action condition[C]// Proceedings of the 2nd Conference on Underground Waste Disposal. Dunhuang：[s.n.]，2008：267–274.(in Chinese)) [6] VAN GENUCHTEN M T. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Science Society of America Journal，1980，44(5)：892–898. [7] FREDLUND D G，XING A，HUANG S. Predicting the permeability function for unsaturated soils using the soil-water characteristic curve[J]. Canadian Geotechnical Journal，1994，31(3)：533–546. [8] FREDLUND D G，XING A，FREDLUND M D，et al. The relationship of the unsaturated soil shear strength to the soil-water characteristic curve[J]. Canadian Geotechnical Journal，1996，33(3)：440–448. [9] VANAPALLI S K，FREDLUND D G，PUFAHL D E，et al. Model for the prediction of shear strength with respect to soil suction[J]. Canadian Geotechnical Journal，1996：33(3)：379–392. [10] DINEEN K，COLMENARES J E，RIDLEY A M. Suction and volume changes of a bentonite-enriched sand[C]// Proceedings of the Institution of Civil Engineers：Geotechnical Engineering. London，UK：Thomas Telford Services Ltd.，1999：197–201. [11] CHEN B，QIAN L X，YE W M，et al. Soil-water characteristic curves of Gaomiaozi bentonite[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(4)：788–793. [12] LLORET A，VILLAR M V. Advances on the knowledge of the thermo-hydro-mechanical behaviour of heavily compacted“FEBEX” bentonite[J]. Physics and Chemistry of the Earth，2007，32(8–14)：701–715. [13] 叶为民，钱丽鑫，陈宝，等. 高压实高庙子膨润土的微观结构特征[J]. 同济大学学报(自然科学版)，2009，37(1)：31–35.(YE Weimin，QIAN Lixin，CHEN Bao. Characteristics of micro-structure of densely compacted Gaomiaozi bentonite[J]. Journal of Tongji University(Natural Science)，2009，37(1)：31–35.(in Chinese)) [14] MIAO L C，LIU S Y，LAI Y M. Research of soil-water characteristics and shear strength features of Nanyang expansive soil[J]. Engineering Geology，2002，65(4)：261–267. [15] 刘月妙，温志坚. 用于高放射性废物深地质处置的黏土材料研究[J]. 矿物岩石，2003，23(4)：42–45.(LIU Yuemiao，WEN Zhijian. Study of clay-based materials for the repository of high level radioactive waste[J]. Mineral Petrol，2003，23(4)：42–45.(in Chinese)) [16] 张虎元，梁建，刘吉胜，等. 混合型缓冲回填材料压实性能研究[J]. 岩石力学与工程学报，2009，28(12)：2 585–2 592.(ZHANG Huyuan，LIANG Jian，LIU Jisheng，et al. Compaction properties of bentonite-sand mixture as buffer material for HLW disposal[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(12)：2 585–2 592.(in Chinese)) [17] FREDLUND D G，RAHURDJO H. Soil mechanics for unsaturated soils[M]. New York：John Wiley and Sons，1993. [18] DELAGE P，HOWAT M D，CUI Y J. The relationship between suction and swelling properties in a heavily compacted unsaturated clay[J]. Engineering Geology，1998，50(1–2)：31–48. [19] TANG A M，CUI Y J. Controlling suction by the vapor equilibrium technique at different temperatures and its application in determining the water retention properties of MX80 clay[J]. Canadian Geotechnical Journal，2005，42(1)：287–296. [20] P?IKRYL R，WEISHAUPTOVÁ Z. Hierarchical porosity of bentonite- based buffer and its modification due to increased temperature and hydration[J]. Applied Clay Science，2010，47(1–2)：163–170. [21] HOFFMANN C，ALONSO E E，ROMERO E. Hydro-mechanical behaviour of bentonite pellet mixtures[J]. Physics and Chemistry of the Earth，2007，32(8–14)：832–849. [22] KOOREVAAR P，MENELIK G，DIRKSEN C. Elements of soil physics[M]. New York：Elsevier Science Publishing Co.，1983. [23] ALONSO E E，GENS A，HIGHT D W. Special problem soils[C]// Proceedings of the 9th European Conference on Soil Mechanics and Foundations. Dublin：[s.n.]，1987：1 087–1 146. [24] 张虎元，刘吉胜，崔素丽，等. 石英砂掺量对混合型缓冲回填材料抗剪强度的控制机制[J]. 岩石力学与工程学报，2010，29(12)：2 533–2 542.(ZHANG Huyuan，LIU Jisheng，CUI Suli. Role of sand content on the shear strength of compacted bentonite-sand mixtures as buffer/backfill material for HLW disposal[J]. Chinese Journal of Rock Mechanics and Engineering，，2010，29(12)：2 533–2 542.(in Chinese))