北京地区多层含水层中施工降水诱发地面沉降的实时预测

发布时间：2018-03-06 01:20

本文选题：多层含水层　切入点：施工降水　出处：《北京工业大学学报》2017年02期 　论文类型：期刊论文

【摘要】：施工降水诱发地面沉降是当前主要岩土工程风险之一,对于以多层含水层为典型水文地质特征的北京地区,这类问题尤为突出.为准确而便捷地进行该类问题预测,首先基于渗流理论和有效应力原理,分析了多层含水层区降水过程中不同层位的压缩量变化规律及主要影响因素,并建立了相应的渗流-压缩耦合数学模型;根据地下水赋存与运动原理,结合北京地区水文地质特征,提出了采用主控含水层来确定耦合模型下边界的新方法,实现了渗流和地层压缩2个物理力学过程在特定地质条件下的耦合,在保证模型科学性和工程精度的同时,降低了实际分析工作的难度,提高了分析模型的实用性;在弱透水层释水率这一重要模型参数取值方面,根据地下水动力学和相关实测资料,研究了既有计算公式存在的误差及其主要原因,并结合北京地方经验,提出了相应的修正方法,进一步提高了模型分析精度.最后,以北京地区某实际工程为例,进行了多层含水层中降水诱发地面沉降的精细模拟,并对数值结果合理性进行了分析.
[Abstract]:Land subsidence induced by construction precipitation is one of the main geotechnical engineering risks at present. This kind of problem is especially prominent in Beijing, where the typical hydrogeological characteristics are multi-layer aquifers. Firstly, based on seepage theory and effective stress principle, the variation law of compressibility and main influencing factors of different layers in the process of precipitation in multi-layer aquifer area are analyzed, and the corresponding coupled mathematical model of seepage and compression is established. According to the principle of groundwater occurrence and movement and the hydrogeological characteristics of Beijing area, a new method of determining the boundary under the coupling model by using the main controlled aquifer is proposed. The two physical and mechanical processes of seepage and formation compression are coupled under specific geological conditions. While ensuring the scientific nature and engineering accuracy of the model, the difficulty of practical analysis is reduced, and the practicability of the analytical model is improved. On the basis of groundwater dynamics and relevant measured data, the errors of the existing formulas and their main causes are studied, and the local experience in Beijing is combined with the local experience in Beijing. A corresponding correction method is proposed to further improve the accuracy of the model analysis. Finally, taking a practical project in Beijing area as an example, the fine simulation of land subsidence induced by precipitation in a multi-layer aquifer is carried out. The rationality of numerical results is analyzed.
【作者单位】：北京工业大学建筑工程学院;北京市勘察设计研究院有限公司;
【基金】：国家自然科学基金资助项目(41572276,41272337) 北京市自然科学基金资助项目(140004) 北京市科技计划资助项目(Z161100001216011)
【分类号】：TU753.66;P642.26

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