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由于缺少建筑材料,在陕北风沙区采用风积沙作为筑坝材料成为一种选择。但沙坝内修建泄洪洞等水工建筑物后,运行过程中存在沉降问题。根据已建工程,采用原型观测和数值模拟方法,分析深厚覆盖层上沙坝内修建泄洪洞的沉降规律。沙坝泄洪洞的沉降在施工过程中就已经发生,竣工期沉降值在坝轴线附近达到24.35cm;上游洞段接缝处出现了不均匀沉降,而且随荷载增加,不均匀沉降更加显著。蓄水到1064.00m时,实测和模拟计算得到的最大沉降值分别为16.00、22.80cm,相差6.80cm,在同一位置附近出现。
Due to the lack of building materials, it is an option to adopt aeolian sand as a dam material in windy and sandy areas of northern Shaanxi. However, after the construction of spillway tunnels and other hydraulic structures in Shaba, there is a problem of settlement during operation. According to the built projects, the principle of prototype observation and numerical simulation are used to analyze the settlement rule of spillway tunnels built in sand bars with deep overburden. The settlement of the spillway tunnel in Sandy Dam has occurred during the construction. The settlement value reaches 24.35cm near the dam axis during the construction period. Uneven settlement occurs in the joint of the upstream tunnel section. As the load increases, the uneven settlement is more significant. Water storage to 1064.00m, the measured and simulated maximum settlement values were 16.00,22.80cm, a difference of 6.80cm, appear in the vicinity of the same location.