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西北风沙区地表被厚厚的沙层覆盖,缺少合适的建筑材料,在深厚覆盖层上采用风积沙作为建筑材料筑坝蓄水成为一种选择.但风积沙与常规筑坝材料不同,土质特性表现出极大的离散性,采用概率分析方法进行相关计算分析显得更加合理.根据已建工程和现场采集的数据,考虑主要材料性能的离散性,运用随机有限元方法对深厚覆盖层上沙坝泄洪洞的沉降问题进行分析.经过1 000次Monte Carlo仿真模拟,预测蓄水至1 082.00m高程时泄洪洞最大沉降量的范围为19.59~35.02cm,平均值为25.36cm;最大沉降值主要分布在22~30cm之间.坝基砂层的压缩模量对泄洪洞最大沉降量影响最大,采取工程措施增大基础砂层的压缩模量,不仅可以显著抑制泄洪洞的沉降,也是防止其继续沉降的最有效、可行的措施.
Northwest windy sand surface covered by thick sand layer, the lack of suitable building materials, the use of aeolian sand as a building material on deep overburden dam building water storage become an option.But the wind and sand and conventional dam materials are different, According to the data of the built projects and on-site acquisition, considering the discreteness of the main material properties, the stochastic finite element method is used to analyze the characteristics of the deep overburden After 1000 times Monte Carlo simulation, it is predicted that the maximum settlement of flood discharge tunnel when the water level is up to 1 082.00m is 19.59 ~ 35.02cm with an average of 25.36cm. The maximum settlement Mainly distributed in the range of 22-30cm.The compressive modulus of the dam foundation layer has the greatest influence on the maximum settlement of the flood discharge tunnel.It takes engineering measures to increase the compressive modulus of the foundation sand layer not only can significantly reduce the settlement of the flood discharge tunnel but also prevent it from Continue to settle the most effective and feasible measures.