现有堤坝地基渗透稳定可靠性研究及加固方案分析

Study on foundation seepage stability reliability and analysis of reinforcing plan for existing dikes and earth-rock dams

针对现有堤防工程和土石坝工程防渗结构中常存在的下游设排水盖重层的结构形式,按照工程结构可靠性理论的基本原理,对其双层地基的渗透稳定可靠性评价中的基本变量和广义抗力及荷载效应进行了分析;基于现行设计规范中渗透稳定确定性计算方法,建立了现有堤防和土石坝工程的地基渗透稳定可靠性分析模型.根据建立的堤坝地基渗透稳定可靠性计算模型和方法,地基渗透稳定可靠性计算的结论能够反映现有堤坝的地基渗透稳定状态,可针对性地提出经济的加固方案.

According to basic principle of engineering structural reliability theory, the basic variables and generalized resistances and loads effect for reliability assessment of double-foundation seepage stability are analyzed in accordance with the common structural shape at downstream drainage and covered weight for impervious structure of existing dikes or earth-rock dams. Based on the deterministic calculation method for seepage stability in present design codes, the reliability analysis model of foundation seepage stability for existing dikes or earth-rock dams is established. According to the reliability calculation model and method of foundation seepage stability for dikes and earth-rock dams, the reliability calculation result of seepage stability for foundation can reflect the stability state of foundation seepage of existing dikes or earth-rock dams, and can be the basis of economical reinforcing plan in accordance with the stability state.