混凝土面板开裂情况下堆石坝应力场与渗流场的耦合分析

【目的】研究混凝土面板开裂情况下堆石坝在应力场与渗流场耦合作用下的工作性态，为混凝土面板堆石坝的设计与施工提供参考。【方法】以多孔岩土介质渗透系数与体积应变之间的数学表达式为基础，研究建立了混凝土面板堆石坝应力场与渗流场耦合分析的数学模型，并基于等宽缝隙稳定流的运动规律，推导建立了混凝土面板裂缝的等效渗透系数计算模型。【结果】当混凝土面板发生开裂时，对于堆石体而言，应力场与渗流场的耦合效应是客观存在的。与不考虑耦合效应相比，考虑耦合效应时坝体的垂直位移最大值出现的位置相对偏向坝体下部，且数值增大了5.5%；坝体的水平位移最大值增大了8.9%，其分布规律也发生了较明显的变化；坝体内渗流自由面明显上升，渗流水头有所增大，同时坝体的单宽渗透流量增加了15.1%。【结论】在混凝土面板开裂情况下，堆石体内应力场与渗流场的耦合效应是客观存在的，因此，考虑耦合效应的计算结果更为合理、可靠。

Coupling analysis of stress field and seepage field for concrete face rockfill dam with slabs cracking

【Objective】Study was done on the concrete rockfill dam working behavior under the coupling action of Stress Field-Seepage Field in the case of concrete face fracture situation,to provide reference for concrete face rockfill dam design and construction.【Method】This research established mathematics mode of coupling action of Stress Field-Seepage Field based on the mathematical expression of permeability coefficient and volumetric strain of porous rock media;And based on the motion law of the same width slit steady flow,the concrete panel cracks equivalent permeability coefficient model was put forward.【Result】For the rockfill,the coupling effect of stress field and seepage field is a kind of objective existence when the concrete slab cracking occurs.Compared with the differences between considering the coupling effect and not considering the coupling effect,the location of the maximum dam vertical displacement was slightly close to the lower part of dam,and its value increased by 5.5%;the dam horizontal displacement increased by 8.9%,and its distribution also had obvious variations;the dam seepage free surface rose obviously,and the seepage hydraulic head increased,and at the same time the dam’s single-wide traffic increased by 15.1%.【Conclution】The coupling effect of stress field and seepage field is a kind of objective existence when the concrete slab cracking occurs.Therefore,considering the coupling effect of the calculation is more reasonable and reliable.