任意排列的承压-潜水完整型干扰井群计算理论及应用
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摘要
井点降水是深基坑和地下构筑物施工中常用的降低地下水位的方法。稳定流理论作为非稳定流理论的特例,在干扰井群计算中应用较广泛。在具体的水文地质条件下,干扰井群经常被概化为一个水文地质模型,进而构成相应数学模型。基于稳定流理论,建立了地下水动力学模型,引入势函数和势的迭加原理,考虑所有任意排列的抽水井对所求点的水位降深影响,以及不同含水层的不同渗透系数,推导了任意排列的承压-潜水完整型干扰井群的理论计算公式。结合具体工程实例,应用所推导的计算公式,得出的降水计算结果,与实际降水结果吻合良好。
Well-point dewater is a commonly used method to reduce underground water level in construction of deep-pit and underground structures. The steady flow theory,being a special example of unsteady flow theory,is widely used in the calculation of interferential wells. Under certain hydrogeological conditions,the interferential wells are often generalized as a hydrogeological model further to build the corresponding numerical model. Based on the steady flow theory,the model of underground hydrodynamics is proposed by using potential function and superposition theorem. The influence of all the arbitrarily arranged wells on water dropping depth and different parameters in different water-bearing layers are considered. And the corresponding theoretical formula is derived for the integrated and arbitrarily arranged interferential wells bearing pressure under water. The calculated results of practical engineering examples are in good agreement with the measured ones.
引文
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