某混凝土心墙堆石坝坝坡优化计算分析

某水库工程拟采用沥青混凝土心墙坝，心墙高度达到116．43 m 。在保证工程安全的前提下，为了提高该沥青混凝土心墙坝的经济性指标，对该坝进行了坝坡优化计算分析。对坝坡方案 A 、方案 B 、方案 C 心墙的计算分析表明：三种方案心墙的最大沉降均出现在坝体中部高程附近，最大沉降量分别为－44．383 cm 、－44．241 cm 、－44．927 cm ，沥青混凝土心墙与坝体协调变位好。在竣工期，各方案坝坡的抗滑稳定安全系数分别为1．537、1．467、1．373；在正常蓄水条件下，各方案坝坡的抗滑稳定安全系数分别为1．461、1．396、1．243，依次降低。方案 B 挖填方量比方案 A 减少了39．96×104 m3（10．15％），坝体稳定性满足设计要求，上下游坝坡坡度适宜，建议设计施工优先采用方案 B 。

Optimization Design of the Dam Slopes of an Asphalt Concrete Core-wall Structure of Rock-fill Dam

A project was proposed to build an asphalt concrete core wall dam ,the height of asphalt concrete core wall reaches 116 .43m .Under the premise of ensuring the safety of engineering ,in order to improve the economy index of the asphalt concrete core wall dam ,the optimization design of dam slopes was proposed in this paper .The calculation and analysis of the core wall stress and strain of plan A ,plan B and plan C show that the maximum subsidence of asphalt con-crete core walls appears in the middle of the dam height ,the subsidence in turn are about -44 .383 cm 、- 44 .241 cm 、-44 .927 cm ,which shows that asphalt concrete core wall has good flexibility to deform harmonically with the dam .Dur-ing the time of completion ,the anti-sliding stability safety coefficients are 1 .537 、1 .467 、1 .373 .During the storage peri-od ,the anti-sliding stability safety coefficients are 1 .461 、1 .396 、1 .243 ,which shows the value decreases as the dam slopes become steeper .The excavation and embankment volume of plan B decreases about 39 .96 × 104 m3 (10 .15% ) in comparison with plan A ,the dam stability can meet design requirements and the dam slope of upstream and downstream is suitable ,so plan B is recommended .