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| Research on mechanism and engineering application of advanced support of pipe-roof for shallow buried and soft rock highway tunnel |
| WU Song1，2，TANG Hua1，LUO Hongxing3，4，DAI Yonghao1，WU Zhenjun1 |
| (1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China；3. Yunnan Communications Investment and Construction Group Co.，Ltd.，Kunming，Yunnan 650200，China；4. Yunnan Dayong Highway Project Construction Headquarters，Dali，Yunnan 671000，China) |
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Abstract According to the equivalent stiffness method of elastic theory，pipe-roofs can be regarded as stiffening rib and reinforced rock can be regarded as an isotropic plate. The reinforced rock and pipe-roofs can be considered as an anisotropic plate on elastic foundation with specific constraints on the four edges. The model of anisotropic plate on elastic foundation is established and solved by finite element method-COMSOL PDE. The mechanic behaviors of pipe-roofs are analyzed. The supporting effects of two commonly used types of pipe-roofs(?76 mm and ?108 mm) are compared and analyzed based on the model tests? result. The research shows that：(1) the stress and deformation of the grouting stabilization area mainly appear in the section no more than 6m ahead of the working face. After adjusting ?76 mm pipe-roof to ?108 mm pipe-roof，My and Mx increase by 56.9% and 5.5% respectively，while the maximum deflection decreases by 38%. It shows that the greater the stiffness of pipe-roof support，the more upper load it needs to bear. So the deformation of surrounding rock can be effectively controlled by reducing the relaxation deformation and stress release of the upper surrounding rock. My of ?108 mm and ?76 mm pipe-roof are 13 and 20 times the size of Mx respectively，which indicates that the pipe-roof has obvious effect on My along the tunnel. But the Mx can not be neglected. Model tests show that a bearing arch is formed with the pipe-roof and the surrounding rock to bear the upper load during the tunnel?s excavation. Along the longitudinal direction of the tunnel，the pipe-roof plays a role of supporting beam to reduce the rock mass?s deformation and the stress release and improve the stabilization of the working face.The achievements are successfully applied in the shallow buried tunnel?s construction. The tunnel?s section is large，and the surrounding rock mass is very weak，and an existing highway project stands nearly. After adjusting ?76 mm pipe-roof scheme to ?108 mm pipe-roof scheme，the maximum surface settlement monitored in the field decreased by 38% and that of the indoor test decreased by 37%. The engineering application shows that the tunnel?s construction is safe and the achievements are reasonable.
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2019, Vol. 38 
