【摘要】 巴基斯坦东北部旁遮普省和阿扎德查谟克什米尔地区交界的玛尔水电站大坝为碾压混凝土重力坝,其坝基岩性为不同强度的砂岩以及砂岩与泥岩互层,区域构造及地震地质背景复杂。在进行岩体质量分级的基础上,研究了坝体横缝及坝体-坝基接触缝模拟方法,选取玛尔电站10~#—11~#坝段群为研究对象,运用CZM双线性模型模拟坝体接触缝,计算分析了考虑砂岩泥岩互层地基情况下坝体的动位移和动应力分布状况。结果表明,减小横缝切割深度可以有效降低坝体的动力响应,对坝体应力分布和抗震安全有利;若考虑坝基的砂岩泥岩互层分布,坝踵、坝趾各点的动应力差异显著。更多还原

【Abstract】 The dam of Mahl Hydropower Station in Pakistan is a RCC gravity dam. The lithology of the bed rock consists of sandstone with different strengths as well as sandstone-mudstone interbedding,for which the regional structure and the geological background of seismic activity therein are complicated. On the basis of the quality classification of rock mass,the method for simulating the transverse joint-dam foundation contact joint is studied herein. Taking the No. 10-11 dam sections of Mahl Hydropower Station as the study object,the contact joint of the dam body is simulated with CZM bilinear model,and then the dynamic displacement and the dynamic stress distribution of the dam body under the consideration of the sandstone-mudstone interbedding foundation are studied and analyzed. The result shows that decreasing the cutting depth of the transverse joint can effectively lower the dynamic response of the dam body,which is favorable to the stress distribution and seismic safety of the dam body. If the sandstone-mudstone interbedding distribution of the dam body is considered,the differences among all the points of both the heel and toe of the dam are significant.更多还原