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本文根据观测资料,分析了铁山坝施工期的变形、应力及渗流特性。分析表明,铁山坝的沉降可用双曲线方程表示,坝壳的填筑质量达到了设计要求,施工期的最大沉降为75毫米,并预测竣工后的沉降率约为0.1％。本文还介绍了测斜仪的观测结果。观测土压力随测点上土柱压力的增加而线性地增大,坝竣工后,则土压力为常数。今后,应根据斜墙内的应力变化状态来确定它开裂的可能性。坝壳内的浸润面很低,表明坝基的防渗设施有效,这对防止坝壳的液化有利,但坝基内的渗流坡降较大。
Based on the observation data, this paper analyzes the deformation, stress and seepage characteristics during the construction of Tieshanba. The analysis shows that the settlement of Tieshanba can be expressed by the hyperbolic equation, and the filling quality of the dam shell meets the design requirements. The maximum settlement during construction is 75 mm and the settlement rate after completion is predicted to be about 0.1%. This article also introduced the observations of inclinometers. The observed earth pressure increases linearly with the increase of soil column pressure at the measuring point. After the dam is completed, the earth pressure is constant. In the future, the possibility of cracking should be determined on the basis of the state of stress change in a sloping wall. The infiltration surface in the dam shell is very low, indicating that the seepage control facilities of the dam foundation are effective, which is good for preventing the liquefaction of the dam shell, but the seepage gradient in the dam foundation is larger.