大化空腹重力坝段实际结构性态分析

Prototype Structure Analysis of Dahua Hollow Gravity Dam

通过对大化水电站４号空腹重力坝段坝体混凝土温度场、施工和运行期坝体混凝土的实测应力、坝基场压力等实测结果的详细分析，认为大化坝体混凝土稳定温度场的假定及混凝土自身体积变形等对坝体混凝土应力的影响很大。分析结果还表明，空腹的存在不仅没有恶化大坝关键部位的应力，还有效地降低了坝基场压力，增加了坝体的抗滑稳定性。

Strong impacts of a stable temperature field,concrete dam body transformation,etc. on concrete stresses of the dam body were derived through analyzing the temperature field and stresses of the concrete dam body, and uplift pressure of the dam foundation of the fourth dam section of Dahua dam. The results of the analysis also displayed that the hollows did not increase stresses at crucial parts, on the contrary, decreased effectively uplift pressure of the dam foundation, and strengthened the slide-resistance of the dam body.