滚石冲击EPE-砂土复合垫层明洞动力响应研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (23) : 211-221.

论文

王东坡1，易雪斌1，周良坤2，闫帅星1，刘彦辉3

作者信息 +

Dynamic response of open cut tunnel with EPE-sand composite cushion under rolling stone impact

WANG Dongpo1, YI Xuebin1, ZHOU Liangkun2, YAN Shuaixing1, LIU Yanhui3

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文章历史 +

摘要

明洞顶部铺设缓冲垫层是提升明洞结构抗滚石冲击性能的重要措施之一，传统垫层主要以砂土材料为主，存在自重大、缓冲效果差等缺点。为此，引入具有轻质、高回弹性能的发泡聚乙烯（EPE）材料，并与砂土组成EPE-砂土复合明洞垫层结构，采用物理模型试验及数值模拟手段，开展滚石冲击EPE-砂土复合垫层明洞动力响应研究及优化设计。研究表明：当垫层总厚度一定时，与传统砂土垫层、纯EPE垫层相比，EPE-砂土复合垫层在减缓滚石冲击力和降低下覆顶板应力及位移上均表现出更好的耗能缓冲效果；进一步，将EPE-砂土复合垫层应用于汶马高速桑坪隧道明洞工程中，通过多组工况数值模拟计算表明：当垫层总厚度设计为1.5 m时，在最大滚石设计冲击能级（1621 kJ）条件下，EPE-砂土复合垫层采用厚度比值为4：1（砂土材料1.2 m，EPE材料0.3 m）时具有最佳防护效果。研究成果可为明洞工程EPE-砂土复合垫层设计提供理论依据及技术支持。
关键词：滚石；EPE-砂土复合垫层；动力响应；优化设计

Abstract

The cushion layer on the roof of the rock-shed can effectively improve the mechanical performance of structure. But the traditional sand cushion has shortcomings such as large weight and poor buffering effect. Therefore, proposing an EPE-Sand composite cushion composed of light and high resilience foamed polyethylene (EPE) material and sand to overcome the above problems, and the research of dynamic response and optimization design of rock-shed with EPE-Sand composite cushion is carried out through physical model test and numerical simulation. The results show that when the thickness of cushion layer is certain, EPE-Sand composite cushion has better energy dissipation effect on reducing the impact force of rockfall and the stress of the overlying roof compared with traditional sand cushion and pure EPE cushion. The performance of EPE-Sand composite cushion in practical engineering is verified relying on the rock-shed project in the Sangping tunnel of Wenchuan-Maerkang expressway, the numerical simulation results show that when the total thickness of the cushion is designed to be 1.5 m and under the conditions of the maximum rolling stone design impact energy level (1621 kJ), the EPE-Sand composite cushion has the best protection effect when the thickness ratio is 4:1 (sand material 1.2 m, EPE material 0.3 m).The research results can provide theoretical basis and technical support for the design of EPE-Sand composite cushion of rock-shed projects.
Key words: Rockfall; EPE-Sand composite cushion; Dynamic response; optimization design

导出引用

王东坡1，易雪斌1，周良坤2，闫帅星1，刘彦辉3. 滚石冲击EPE-砂土复合垫层明洞动力响应研究[J]. 振动与冲击, 2022, 41(23): 211-221

WANG Dongpo1, YI Xuebin1, ZHOU Liangkun2, YAN Shuaixing1, LIU Yanhui3. Dynamic response of open cut tunnel with EPE-sand composite cushion under rolling stone impact[J]. Journal of Vibration and Shock, 2022, 41(23): 211-221

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