论文部分内容阅读
建在佐治亚州 Eatonton 附近 Oconee 河上的瓦拉斯(Wallace)坝,有两个土坝段,在粘土坝体中设置了垂直排水(烟囱式排水)。为了评价瓦拉斯坝西坝段排水设施的效果,曾用有限单元迦辽金(Galerkin)法建立数学模型,来研究通过土坝的稳定饱和一非饱和渗流特性。所得模型被用于瓦拉斯坝西坝段58+00断面的计算。本文分析了四种情况的计算结果,说明零等压线的位置和总水头值均在高程425～365英尺(130～111米)范围。计算结果表明,当取饱和水平导水率为O.283英尺/日(8.64厘米/日)时,其最大渗流速度为2.62英尺/日(0.80米/日),最大渗流量为0.266英尺~3/秒(7.52×10~(-3)米~3/秒)。沿坝基静水扬压力的分析说明,从坝上游到下游侧,静水扬压力平均减小51英尺(16米)。在排水体上游侧和内部以实际渗流速度与临界渗流速度的比值表示抗管涌的安全系数,其值范围为0.3～3.7(抗土中发生流土的安全系数)。
The Wallace Dam, built on Oconee River near Eatonton, Georgia, has two earth segments with vertical drainage (chimney-type drainage) in the clay dam. In order to evaluate the effectiveness of drainage facilities at the West Dam section of Huaraz dam, finite element Galerkin method was used to establish a mathematical model to study the stability of saturated and unsaturated seepage through earth dam. The resulting model is used for the calculation of section 58 + 00 of the West Dam of Huaraziba. In this paper, the results of four cases are analyzed. The results show that the location of the zero isobaric line and the total head are in the range of 425 ~ 365 ft (130 ~ 111 m). The calculated results show that the maximum seepage velocity is 2.62 ft / day (0.80 m / day) and the maximum seepage rate is 0.266 ft 3 when the saturated hydraulic conductivity is 0.28 ft / day (8.64 cm / day) / Second (7.52 × 10 ~ (-3) m ~ 3 / second). An analysis of the hydrostatic pressure along the dam foundation shows that the hydrostatic pressure is reduced by an average of 51 ft (16 m) from the dam upstream to the downstream. The ratio of actual seepage velocity to critical seepage velocity is expressed in the upstream side and inside of the drainage body. The safety factor of tube inrush is in the range of 0.3 ~ 3.7 (the safety factor of earth flowing in soil resistance).