大规模压气储能洞室稳定性和洞周应变分析  

Stability and tangential strain analysis of large-scale compressed air energy storage cavern

作　　者：夏才初[1] 张平阳 周舒威[1] 周瑜[1] 王蕊 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]中国大唐集团新能源股份有限公司,北京100053

出　　处：《岩土力学》2014年第5期1391-1398,共8页Rock and Soil Mechanics

基　　金：国家自然科学基金资助(No.51278378);国家高技术研究发展计划(863计划)项目(No.SS2012AA052501)

摘　　要：地下储气构造物是压气储能(CAES)电站选址的决定因素,其中人工开挖的硬岩洞室因其受地质构造限制小、适应范围广而备受关注。针对压气储能地下洞室方案选型和密闭性要求,选择了典型的洞室埋深(200、300、500 m),考虑不同的洞室形式(隧道式和大罐式)和洞室尺寸,采用Abaqus有限元软件计算出高内气压下压气储能洞室围岩的塑性区和洞周应变。通过分析开挖后和充气后两个工况下围岩的受力和变形特征,获得合适的洞室形式。当围岩级别为Ⅱ级、内压为10 MPa的情况下,埋深为300 m的圆形洞室和大罐式洞室稳定性较好,该埋深下6 m直径圆形洞室最大洞周应变为7.55410??,容积为5 310 m大罐式洞室最大洞周应变为5.54410??,以上值都在一般橡胶类高分子密封材料的正常工作范围内,这为密封材料在不同温度下的延伸率和耐久性研究提供了基础数据。Compressed air energy storage is a kind of technology to storage energy and generate electricity using compressed air as the medium. Underground structure for compressed air energy storage（CAES） is a decisive factor to choose the location of compressed air energy storage plant, in which artificially-excavated hard rock cavern is more worth researching for little restricted to geology and wide adaptability. To select a scheme of underground cavern for compressed air energy storage, the stability of CAES cavern under high inner pressure is studied by FEM. Plastic zone and tangential strain of CAES cavern with typical buried depth （200, 300, 500 m）, various layouts（tunnels and jars） and dimensions, are calculated by finite element software Abaqus. By analyzing the stress and deformation characteristics of surrounding rock after excavation and inflation, suitable cavern form is achieved. When surrounding rock class is Ⅱ and inner pressure is 10 MPa, caverns buried in depth of 300 m are of good stability. Buried in the depth of 300 m, the maximum tangential strain of 6 m-diameter round cavern and jar cavern are 7.55 and 5.54 respectively, which lays a foundation for research on elongation and durability of sealing material in different temperatures.

关 键 词：压气储能 硬岩洞室 有限元法 稳定性 洞周应变 

分 类 号：TU457[建筑科学—岩土工程]