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定向爆破堆石坝应力变形特性研究
黄志鸿,杨 杰,程 琳,孙晓宁,马春辉
1.西安理工大学 水利水电学院;2.西安水务集团石砭峪水库管理有限公司
摘要:
结合实测数据与数值模拟方法对某定向爆破堆石坝体结构在不同阶段的应力、变形特性进行了分析,探讨定向爆破堆石坝的应力变形规律,并重点讨论了爆破堆石体和防渗结构的力学行为。对比分析表明:不同于常规坝体的最大沉降位于坝体2/3部位,爆破堆石最大沉降发生在爆破堆石体顶部,大坝实测数据与数值计算结果吻合良好,验证了数值模拟计算的可靠性。爆破堆石坝竖向变形约为1.19 m,占最大坝高的1.4%,爆破堆石及坡积物的可压缩性是其产生较大沉降的主要原因。在此基础上,分析了防渗结构应力变形的影响。结果表明:由于筑坝材料组成复杂、材料力学特性相差较大,导致大坝局部出现一定的不均匀沉降。同时700 m平台以下的反弧处出现较大的变形和应力,对沥青混凝土防渗斜墙变形造成较大影响。此外,库水位的抬升使沥青混凝土防斜墙的应力和变形规律发生了较大的变化,防渗体应力和变形明显增加。上述关于定向爆破堆石坝的应力变形规律的总结,较为全面、真实的反映了定向爆破堆石坝的爆破堆石体、坝体、防渗体的运行性态,同时也对高面板堆石坝、软岩筑坝、弃渣坝、滑坡、堰塞体等大变形结构体的安全性态研究具有一定参考价值。
关键词:  定向爆破堆石坝  安全监测  应力变形  沥青混凝土斜墙防渗
DOI:
分类号:TV311
基金项目:国家自然科学基金青年科学(51809212);陕西省自然科学基础研究计划重点项目(2018JZ5010);陕西省水利科技计划项目(2018SLKJ-5)
Stress-deformation behavior of a blast-fill dam
huangzhihong1, YANG Jie1, CHENG Lin1, SUN Xiaoning2,3,4, MA Chunhui1
1.Institute of Water Resources and Hydro-electric Engineering,Xi’an University of Technology;2.Xi'3.'4.an Water (Group) Shijie Reservoir Management Co., Ltd.
Abstract:
The stress-deformation behaviour of a blast-fill dam at different stages was examined based on in-situ monitoring data and finite element analysis (FEA). The mechanical behaviour and the impervious structures of blasting rockfill were investigated. Comparative analysis showed that the maximum settlement of the blasting rock occurred at the top of the blasting rockfill. The stress and deformation values computed using the FEA Model were consistent with the measured data. The settlement of the blast-fill dam was 1.19 m, which accounted for 1.4% of the maximum dam height. The compressibility of the blasting rockfills and the slope deposit were the main factor for their large settlement. The numerical simulation was used to analyse the influence of stress-deformation behaviour of impervious structures. The results showed that due to the complex composition of the dam material and the large difference in the mechanical properties of the material, some uneven settlement of the dam occurs locally. Large deformation and stress occurred at the reverse arc below the 700 m platform . The rise of the water level has caused a great change in the stress-deformation behaviour of the asphalt concrete wall. The above summary is a comprehensive and true reflection of the operational behaviour of blasting rockfill body, dam body and impervious structures of blast-fill dam. The findings of this study provide are of great value for the study of the safety state of high face rock-fill dam, soft rock dam, slag field, landslide and quake lake.
Key words:  blast-fill dams  stress-deformation behavior  safety monitoring  impervious body
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