压缩空气储能(Compressed Air Energy Storage,CAES)可广泛应用于电网削峰填谷和大规模新能源消纳,具有装机容量大、使用寿命长、清洁环保等优点,被视为最有前途的大规模储能技术之一。目前国内外主要依托层状盐穴或盐丘来建设CAES储气...压缩空气储能(Compressed Air Energy Storage,CAES)可广泛应用于电网削峰填谷和大规模新能源消纳,具有装机容量大、使用寿命长、清洁环保等优点,被视为最有前途的大规模储能技术之一。目前国内外主要依托层状盐穴或盐丘来建设CAES储气库,但由于选址条件苛刻等原因,CAES产业的发展受到了极大限制。近年来,随着国内矿井的大量关闭,许多地下空间资源被浪费,因此利用废弃矿井建设CAES电站就具有了巨大的生态经济效益与广袤的发展前景。因此,系统梳理了CAES各类储气库建设现状与优缺点,总结了废弃矿井CAES储气库的建设与选址要求,分析了当前废弃矿井CAES储气库面临的安全风险与限制瓶颈。为避免CAES储气库建设与运营过程中存在的安全风险,提出了新的储气库建设方案——管道布设型废弃矿井储气库(利用大直径无缝钢管作为储气空间,缝隙内填充松散充填体进行承压),与传统储气库建设方案相比,该方案具有以下优势:极大降低了储气库对矿区地质构造、围岩渗透性、围岩稳定性等条件的选址要求,增加了选址范围;可利用现有管道施工工艺与技术装备,降低储气库建设难度;提高了储气库的密封性能,保障无气体泄漏风险;改善了围岩应力环境,提高了储气库稳定性;避免储气库受腐蚀影响,增加了储气库的耐久性能。最后以鄂庄废弃煤矿为例,给出了管道布设型储气库改造建设方案,储气库改造建设完成后,总容积可达4.5×105 m3,发电功率可达400 MW,可产生良好的经济效益。管道布设型废弃矿井储气库设计构想为废弃矿井CAES技术发展提供了新思路,具有大规模推广应用的潜力。展开更多
The addition of basement beneath existing building changes the underpinning pile from fully embedded to partially embedded,and thus influences the mechanical properties of pile.In the past,scholars paid attention to t...The addition of basement beneath existing building changes the underpinning pile from fully embedded to partially embedded,and thus influences the mechanical properties of pile.In the past,scholars paid attention to the change in the bearing capacity of pile but neglected the difference of dynamic characteristics before and after construction,and potential changes in stress history of remaining soil are also ignored.In this work,a calculation model is built to investigate the influence of excavation on dynamic impedance of underpinning pile considering the effect of stress history.The soil is simulated by the dynamic Winkler foundation,which is characterized by springs and dashpots.Properties of remaining soil after excavation are updated to consider the effect of stress history through modifying the initial shear modulus and related parameters.The dynamic impedance of pile after excavation is obtained based on the transfer matrix method.The parameter study is carried out to evaluate the dynamic impedance with various excavation depths,considering or ignoring stress history effect,and various element lengths.The results show that shallow soil plays an important role to dynamic impedance,and overestimated dynamic impedance is obtained if not considering the stress history effect.展开更多
文摘压缩空气储能(Compressed Air Energy Storage,CAES)可广泛应用于电网削峰填谷和大规模新能源消纳,具有装机容量大、使用寿命长、清洁环保等优点,被视为最有前途的大规模储能技术之一。目前国内外主要依托层状盐穴或盐丘来建设CAES储气库,但由于选址条件苛刻等原因,CAES产业的发展受到了极大限制。近年来,随着国内矿井的大量关闭,许多地下空间资源被浪费,因此利用废弃矿井建设CAES电站就具有了巨大的生态经济效益与广袤的发展前景。因此,系统梳理了CAES各类储气库建设现状与优缺点,总结了废弃矿井CAES储气库的建设与选址要求,分析了当前废弃矿井CAES储气库面临的安全风险与限制瓶颈。为避免CAES储气库建设与运营过程中存在的安全风险,提出了新的储气库建设方案——管道布设型废弃矿井储气库(利用大直径无缝钢管作为储气空间,缝隙内填充松散充填体进行承压),与传统储气库建设方案相比,该方案具有以下优势:极大降低了储气库对矿区地质构造、围岩渗透性、围岩稳定性等条件的选址要求,增加了选址范围;可利用现有管道施工工艺与技术装备,降低储气库建设难度;提高了储气库的密封性能,保障无气体泄漏风险;改善了围岩应力环境,提高了储气库稳定性;避免储气库受腐蚀影响,增加了储气库的耐久性能。最后以鄂庄废弃煤矿为例,给出了管道布设型储气库改造建设方案,储气库改造建设完成后,总容积可达4.5×105 m3,发电功率可达400 MW,可产生良好的经济效益。管道布设型废弃矿井储气库设计构想为废弃矿井CAES技术发展提供了新思路,具有大规模推广应用的潜力。
基金Projects(51878487,41672266)supported by the National Natural Science Foundation of China。
文摘The addition of basement beneath existing building changes the underpinning pile from fully embedded to partially embedded,and thus influences the mechanical properties of pile.In the past,scholars paid attention to the change in the bearing capacity of pile but neglected the difference of dynamic characteristics before and after construction,and potential changes in stress history of remaining soil are also ignored.In this work,a calculation model is built to investigate the influence of excavation on dynamic impedance of underpinning pile considering the effect of stress history.The soil is simulated by the dynamic Winkler foundation,which is characterized by springs and dashpots.Properties of remaining soil after excavation are updated to consider the effect of stress history through modifying the initial shear modulus and related parameters.The dynamic impedance of pile after excavation is obtained based on the transfer matrix method.The parameter study is carried out to evaluate the dynamic impedance with various excavation depths,considering or ignoring stress history effect,and various element lengths.The results show that shallow soil plays an important role to dynamic impedance,and overestimated dynamic impedance is obtained if not considering the stress history effect.
