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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 factor affecting the stability of underground gas storage. Accurate prediction and calculation of settlement is an important means to ensure the safe operation of gas storage. In this paper, according to the special geologic conditions in Yantian area of Pingdingshan, the settlement calculation model based on Schnute growth curve is proposed based on the analysis of settlement mechanism. The model parameters are obtained by nonlinear fitting with monitoring data, and the thin- Land subsidence has been theoretically calculated. The results show that the 40,000 square gas storage reservoir with a pressure of 10 MPa has a settlement of 26.4 mm, 50.4 mm, 58.5 mm, 61.9 mm and 65.1 mm after creep 5a, 10a, 15a, 20a and 30a, respectively . This indicates that the surrounding rock of the underground caverns in the interbedded salt rock is relatively stable and will not cause the large-scale overlying strata to move. The research results are of certain reference significance to the construction of salt rock gas reservoirs and the prevention and control of geological disasters.