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首页> 外文期刊>Bulletin of engineering geology and the environment >Sensitivity analysis of related parameters in simulation of land subsidence and ground fissures caused by groundwater exploitation
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Sensitivity analysis of related parameters in simulation of land subsidence and ground fissures caused by groundwater exploitation

机译：地下水开采引起的地面沉降和地面裂隙模拟中相关参数的敏感性分析

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摘要

Hydraulic and mechanical parameters are very important in the calculation of models of land subsidence and ground fissures caused by groundwater exploitation. To investigate the degree of influence of these parameters on calculation of models of land subsidence and ground fissures, Morris' global sensitivity analysis, combined with local sensitivity analysis, was applied. The accuracy of soil parameter sensitivity analysis is related closely to selection of the calculation model used. Based on Biot's consolidation theory, and combined with the nonlinear rheological theory of soil, a three-dimensional full coupling mathematic model was established to simulate land subsidence and ground fissures, in which the constitutive relation in Biot's consolidation theory was extended to viscoelastic plasticity. The dynamic relationships of soil parameters (porosity, permeability coefficient, parameters of soil deformation) accompanied by changes in the stress field were also considered. Consequently, this model conforms to actual conditions in the field. Nantong, Jiangsu Province in China, was selected to simulate and calculate land subsidence and ground fissures using this model, and the soil parameters' sensitivities were analyzed. The results showed that elastic modulus, E, cohesion, c, and the specific weight of soil, lambda, have a significant influence on land subsidence and ground fissures, with the influence of the friction angle, phi, on land subsidence, and of Poisson's ratio, m, on ground fissures taking second place. These five parameters are thus of major concern in the simulation of land subsidence and ground fissures.
机译：在计算地下水开采引起的地面沉降和地面裂缝的模型时，水力和机械参数非常重要。为了研究这些参数对地面沉降和地面裂缝模型计算的影响程度，应用了莫里斯的全局敏感性分析和局部敏感性分析。土壤参数敏感性分析的准确性与所用计算模型的选择密切相关。在Biot固结理论的基础上，结合土壤非线性流变学理论，建立了三维全耦合数学模型来模拟地表沉陷和地面裂隙，将Biot固结理论中的本构关系扩展到粘弹性塑性上。还考虑了随应力场变化而变化的土壤参数（孔隙度，渗透系数，土壤变形参数）的动态关系。因此，该模型符合现场实际条件。利用该模型选择了江苏省南通市来模拟和计算地面沉降和地面裂隙，并分析了土壤参数的敏感性。结果表明，弹性模量E，内聚力c和土壤的比重lambda对地面沉降和地面裂缝有显着影响，而摩擦角phi对地面沉降和泊松比影响很大。比，m，在地裂缝中排名第二。因此，这五个参数是模拟地面沉降和地面裂缝的主要考虑因素。

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