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针对在含水层中存在非线性流情况下,分析非稳定井流试验数据及确定含水层参数的方法较少的问题,该文首先在已有非稳定井流问题解析解的基础上,进行了进一步的推导和简化,得到了能够方便应用的数值表达式;然后又根据最小二乘原理,构造了用于分析含水层中存在非线性流时的抽水试验数据、确定了含水层参数与非线性渗流参数的目标函数,并编写了用于求解该问题的粒子群优化算法专门程序;最后,通过数字算例验证了方法的可行性和可靠性。
Aiming at the problem that there are few methods to analyze the test data of unstable well flow and determine the parameters of aquifer under the condition of non-linear flow in aquifer, firstly, based on the existing analytic solution of well flow problem, Further derivation and simplification, the numerical expression that can be conveniently applied is obtained. Then, according to the principle of least squares, the pumping test data for analyzing the existence of nonlinear flow in the aquifer is constructed, and the parameters of the aquifer and the nonlinearity The objective function of the seepage parameters and the special program of the particle swarm optimization algorithm for solving the problem are compiled. Finally, the numerical example is given to verify the feasibility and reliability of the method.