摘要
在压气储能地下储气库中构建“膨润土-薄钢板”复合密封层结构,该密封层中膨润土吸水膨胀挤压薄钢板、薄钢板受压产生弹性反力约束膨润土膨胀,故膨润土属于恒刚度约束的膨胀行为。为模拟该行为,研制了功能齐全、操作方便、成本低廉的膨胀仪。仪器主要由底座、试样仓、活塞、恒刚度约束反力架、注水控制器、数据采集盒等组成。以团粒膨润土为研究对象,开展了验证性试验。结果表明,仪器可完整再现膨润土在恒刚度约束下的膨胀行为,与分级加载平衡法得到的试验结果相比,相同膨胀率下前者膨胀力普遍大于后者;而且,前者的试验结果更加符合真实情况。通过变换反力架的约束组合,该仪器还可用于模拟恒体积膨胀力、无荷膨胀率测试;同时,联合特制的高压加载系统(最大加载20 MPa),可开展膨润土膨胀后的加、卸载试验,研究储气库充、放气过程中膨润土变形行为,初步论证了“膨润土-薄钢板”复合密封层结构合理性,充分展示了该仪器的可靠性和可拓展性,体现了一机多用的功能优势。
A composite sealing layer structure of"bentonite-thin steel plate"has been constructed in the lined rock caverns(LRC)for compressed air energy storage(CAES).In this sealing layer,bentonite absorbs water and expands,thereby squeezing the thin steel plate.The thin steel plate generates an elastic reaction force under pressure,which in turn restrains the expansion of bentonite.Therefore,the swelling behavior of bentonite falls under the category of expansion under constant stiffness constraint.To simulate this behavior,a swelling apparatus with comprehensive functions,convenient operation and low cost was developed.The instrument mainly consists of the instrument base,sample chamber,piston,constant stiffness constraint reaction frame,water injection controller,data acquisition box,and so on.With granular bentonite as the research object,verification tests were conducted.The findings indicate that the instrument is capable of accurately replicating the swelling behavior of bentonite under the constant stiffness constraint.Compared with the results obtained by the staged loading equilibrium method,the swelling pressure of the former is generally higher than that of the latter at the same swelling ratio.Moreover,the results of the former are more consistent with the real situation.By changing the constraint combination of the reaction frame,the instrument can also be used to simulate swelling behaviors under constant volume constraint and zero-loading constraint.Meanwhile,in conjunction with the specially designed highpressure loading system(with a maximum loading capacity of 20 MPa),the loading and unloading tests of bentonite after expansion can be carried out to investigate the deformation behavior of bentonite during the charging and discharging processes of the CAES.The preliminary demonstration of the rationality of the"bentonite-thin steel plate"composite sealing layer structure fully underscores the reliability and scalability of the instrument,highlighting its functional advantage of"one machine serving multiple purposes".
作者
谈云志
郭金辉
吴克宇
明华军
王冲
吴军
TAN Yun-zhi;GUO Jin-hui;WU Ke-yu;E MING Hua-jun;E WANG Chong;WU Jun(College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang,Hubei 443002,China;The Institute of Problematic Soils Mechanics,China Three Gorges University,Yichang,Hubei 443002,China;Hubei Key Laboratory of Disaster Prevention and Mitigation,China Three Gorges University,Yichang,Hubei 443002,China)
出处
《岩土力学》
北大核心
2026年第2期402-412,共11页
Rock and Soil Mechanics
基金
湖北省自然科学基金(No.2024AFA004,No.2023AFD198)
国家自然科学基金(No.52279102)。
关键词
膨胀仪
恒刚度约束
膨润土
压气储能
swelling apparatus
constant stiffness constraint
bentonite
compressed air energy storage(CAES)
