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
1.State Key Lab of Geohazard Prevention and Geologic Environment Protection, Chengdu University of Technology, Chengdu 610059, China;
2.Chengdu Engineering Corporation Limited, Chengdu 611130, China;
3.The 1st Survey and Design Institute Group Co., Ltd., China Railway, Xi’an 710043, China
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
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. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(23): 211-221.
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