摘要
地表沉降是影响地下储气库稳定性的关键因素,准确预测和计算沉降量是保证储气库安全运行的重要手段。本文针对平顶山盐田地区特殊的地质条件,在分析沉降机理的基础上提出了基于Schnute生长曲线的沉降计算模型,利用监测数据通过非线性拟合得到模型参数,并对薄层状盐穴储气库地面沉降进行了理论计算。研究结果表明,储气压力为10MPa的40万方储气库,在蠕变5a、10a、15a、20a和30a之后,中心点沉降分别为26.4mm、50.4mm、58.5mm、61.9mm和65.1mm。预示着互层状盐岩地下溶腔的围岩比较稳定,不会造成上覆地层的大规模移动,研究成果对盐岩储气库工程建设和地质灾害防治具有一定的参考意义。
Surface subsidence is the key influence factor of underground gas storage stability,and its accurate prediction and calculation is the important means to assure the safety and stability of gas storage. In view of the special geological condition of Pingdingshan salt field,the subsidence calculation model is deduced based on Schnute growth curve in biological field,and the parameters are determined by nonlinear fitting according to the monitoring data,then the surface subsidences of the thin-layered salt rock gas storage is calculated. The results show that the central point subsidence of gas storage with volume of 4 × 105m3 under pressure of 10 MPa are 26. 4mm,50. 4mm,58. 5mm,61. 9mm and 65. 1mm respectively after development time of 5a,10 a,15a,20 a and 30 a. The data indicate that the surrounding rock of underground gas storage is stable and overlying strata will not produce large displacement. The conclusions have some reference significance to salt field gas storage construction and the prediction of geological disasters.
出处
《工程勘察》
2016年第5期1-5,共5页
Geotechnical Investigation & Surveying
基金
国家自然科学基金项目(41272339)
关键词
互层状盐岩
盐田储气库
地面沉降
沉降模型
inter-bed layered salt rock
salt rock gas storage
surface subsidence
subsidence model
