平顶山地下盐穴储气库地表沉降机理数值模拟  

Numerical Simulation on Mechanism of Surface Subsidence Caused by Gas Storage of Salt Cavern in Pingdingshan

作　　者：王志荣[1] 贺平[1] 石茜茜 韩中阳 张利民[2] Wang Zhirong;He Ping;Shi Xixi;Han Zongyang;Zhang Limin(School of Water Conservancy and Environment Engineering,Zhengzhou University,Zhengzhou 450001,P.R.China;Resources and Environment Research Center,Henan Coalfield Geology Bureau,Zhengzhou 450053,P.R.China)

机构地区：[1]郑州大学水利与环境学院,郑州450001 [2]河南省煤田地质局资源环境调查中心,郑州450053

出　　处：《地下空间与工程学报》2018年第4期1105-1113,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(41272339);河南省自然科学基金(182300410149)

摘　　要：针对平顶山盐田盐层薄、夹层多,埋藏深的特点,采用Fortran语言将蠕变模型导入有限元软件,分别建立单腔、双腔和群腔储气库计算模型,并且根据地面监测资料拟合得到模型参数,对不同工况下薄层状盐穴储气库的地面沉降进行了预测。研究结果表明:(1)储气压力10 MPa时40万方储气库,单腔蠕变影响范围约为30 m,蠕变5 a、10 a、15 a、20 a、30 a之后中心点沉降分别为49.21 mm、53.60 mm、57.70 mm、61.51 mm、64.44 mm,沉降范围基本一致约为1 500 m;(2)由于双腔相互影响,中点最大沉降量和沉降范围都比单腔略大,从溶腔稳定与沉降控制角度分析,地面对井最佳水平间距应大于地下溶腔最大直径的1.5倍;(3)群腔模式下中心点最大沉降量和沉降范围都有所增大,而且随着腔数的增加,二者增大的趋势越明显。以7溶腔储气库群为例,蠕变30 a之后中心点的沉降量达到247 mm,沉降的影响范围达到2 480 m。In view of the characteristics of thin thickness,multilayer and deep burial,Using the Fortran language to program the creep model and import the finite element software. The calculation models for single-chamber,double-chamber, and group-cavity gas storages were established respectively. Meanwhile, the model parameters were obtained according to the ground monitoring data,and the ground subsidence of the thin layer salt cavern reservoir in different working conditions was predicted. The results show that ：（ 1） the creep reach of gas storage with volume of 4×105 m3 is 30 m under pressure of 10 MPa,and the subsidence of center point are 49.21 mm,53.60 mm,57.70 mm,61.51 mm,64.44 mm respectively after creep time of 5 a,10 a,15 a,20 a,30 a,while the effect scope of subsidence are basically the same with a value of 1 500 m.（ 2） The subsidence of double cavity is slightly larger than single cavity,and the reasonable space of double cavity should be 1.5 times the size of maximum diameter from the perspective of subsidence control.（ 3） The central point subsidence and influence radius of group cavity are obviously larger,meanwhile the central point subsidence and influence radius of 7-cavity gas storage are247 mm and 2 480 m respectively after 30 years of creep.

关 键 词：互层状盐岩 地下储气群库 围岩蠕变 地面沉降 数值分析 

分 类 号：TU452[建筑科学—岩土工程]