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为在砂砾软岩上经济、快速地修建拱坝,针对软岩强度低、变形大的特点,分析了水压和累积自重作用下软岩上的拱坝受力和变形规律,提出了以下工程策略:上游坝面周边设置人工拱面缝释放岩石拉应力,缝端用槽钢止裂;下游布置推力墩增强坝肩,限制变位;扩大基础均化坝体由自重产生的压应力集中。结果表明:在软岩上采取上游面设置人工拱面缝释放拉应力,下游面设置推力墩限制变位的措施后,拱坝及其周边岩石能够满足内应力及承载力要求。
In order to construct the arch dam economically and rapidly on sandy soft rock, aiming at the low strength and large deformation of soft rock, the stress and deformation rules of arch dam under soft rock under water pressure and cumulative self-gravity are analyzed. The following engineering strategies are proposed: Set the artificial arch seam around the upstream dam surface to release the rock tensile stress, the slot ends with the channel to crack; the thrust pier is arranged downstream to enhance the dam abutment to limit displacement; expand the concentration of compressive stress by the self-weight of the basic homogenizing dam body. The results show that the arch dam and its surrounding rock can meet the requirements of internal stress and bearing capacity by adopting the measures of releasing the tensile stress of the artificial arch seam on the upstream face and controlling the displacement of the thrust face on the downstream face.