Numerical Analysis of the Vertical Crown Displacements in Triple Adjacent Tunnels with Rock Bolts and Pipe Roofings
This study aimed to investigate the effects of installing pipe roofings and rock bolts before bench cuts during the excavation of a tunnel. The limited space available during excavation resulted in the formation of triple adjacent tunnels. To solve the issue of narrow spacing between the tunnels, mi...
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| Veröffentlicht in: | Processes 2022-10, Vol.10 (10), p.2062 |
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| creator | Chen, Shong-Loong Tsai, Yi-Hao Zhang, Xiao-Ling Tang, Chao-Wei Hsu, Yu-Yun |
| description | This study aimed to investigate the effects of installing pipe roofings and rock bolts before bench cuts during the excavation of a tunnel. The limited space available during excavation resulted in the formation of triple adjacent tunnels. To solve the issue of narrow spacing between the tunnels, middle posts were added for greater stiffness, and pipe roofings were installed to prevent collapse in tunnel sections with shallow overburden where the rock weathering was significant. PLAXIS 3D 2018, a finite element analysis program, was used to simulate the wall rock displacement during the bench cuts with pipe roofings and rock bolts installed. In addition, the difference between the presence and absence of bias pressure was studied. It was found that, in the absence of bias pressure, the tensile and compressive forces were symmetric from side to side. However, under bias pressure, the tensile force remained unchanged. Moreover, the compressive force under bias pressure was three times greater than without bias pressure and was concentrated at the sidewall of the eastbound tunnel and the crown of the mass rapid transit (MRT) tunnel. The results may be helpful for the design and construction of multiple adjacent tunnels in the future. |
| doi_str_mv | 10.3390/pr10102062 |
| format | Article |
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The limited space available during excavation resulted in the formation of triple adjacent tunnels. To solve the issue of narrow spacing between the tunnels, middle posts were added for greater stiffness, and pipe roofings were installed to prevent collapse in tunnel sections with shallow overburden where the rock weathering was significant. PLAXIS 3D 2018, a finite element analysis program, was used to simulate the wall rock displacement during the bench cuts with pipe roofings and rock bolts installed. In addition, the difference between the presence and absence of bias pressure was studied. It was found that, in the absence of bias pressure, the tensile and compressive forces were symmetric from side to side. However, under bias pressure, the tensile force remained unchanged. Moreover, the compressive force under bias pressure was three times greater than without bias pressure and was concentrated at the sidewall of the eastbound tunnel and the crown of the mass rapid transit (MRT) tunnel. The results may be helpful for the design and construction of multiple adjacent tunnels in the future.</description><identifier>ISSN: 2227-9717</identifier><identifier>EISSN: 2227-9717</identifier><identifier>DOI: 10.3390/pr10102062</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Analysis ; Bias ; Equilibrium ; Excavation ; Finite element analysis ; Finite element method ; Geology ; Light rail transportation ; Numerical analysis ; Overburden ; Pipes ; Pressure ; Rock bolts ; Roofing ; Simulation ; Stiffness ; Tunnel construction ; Tunnels</subject><ispartof>Processes, 2022-10, Vol.10 (10), p.2062</ispartof><rights>COPYRIGHT 2022 MDPI AG</rights><rights>2022 by the authors. Licensee MDPI, Basel, Switzerland. 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The limited space available during excavation resulted in the formation of triple adjacent tunnels. To solve the issue of narrow spacing between the tunnels, middle posts were added for greater stiffness, and pipe roofings were installed to prevent collapse in tunnel sections with shallow overburden where the rock weathering was significant. PLAXIS 3D 2018, a finite element analysis program, was used to simulate the wall rock displacement during the bench cuts with pipe roofings and rock bolts installed. In addition, the difference between the presence and absence of bias pressure was studied. It was found that, in the absence of bias pressure, the tensile and compressive forces were symmetric from side to side. However, under bias pressure, the tensile force remained unchanged. Moreover, the compressive force under bias pressure was three times greater than without bias pressure and was concentrated at the sidewall of the eastbound tunnel and the crown of the mass rapid transit (MRT) tunnel. The results may be helpful for the design and construction of multiple adjacent tunnels in the future.</description><subject>Analysis</subject><subject>Bias</subject><subject>Equilibrium</subject><subject>Excavation</subject><subject>Finite element analysis</subject><subject>Finite element method</subject><subject>Geology</subject><subject>Light rail transportation</subject><subject>Numerical analysis</subject><subject>Overburden</subject><subject>Pipes</subject><subject>Pressure</subject><subject>Rock bolts</subject><subject>Roofing</subject><subject>Simulation</subject><subject>Stiffness</subject><subject>Tunnel construction</subject><subject>Tunnels</subject><issn>2227-9717</issn><issn>2227-9717</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNpNUU1LAzEQXUTBUnvxFwS8CVvzsbvZHGv9hKIi1euSZpM2NZusSZbSf2-0gs4cZnjz3oPhZdk5glNCGLzqPYIIYljho2yEMaY5o4ge_9tPs0kIW5iKIVKX1SgLT0MnvRbcgJnlZh90AE6BuJHgXfr4c5h7t7PgRofecCE7aWMA2oKl172RYNZuE2ojWA7WShPATscNeHXiA1w7k6jctuBF9zJhTmm7DmfZieImyMnvHGdvd7fL-UO-eL5_nM8WuSCkiDmriFIl4gqTtmQtrkssMWEIUcUpKhDntSowKVZYrQq1KuukgnUJ66LCSNQtGWcXB9_eu89Bhths3eDTl6HBNNmhCmKaWNMDa82NbLRVLnouUrey08JZqXTCZ7QoGMOMlklweRAI70LwUjW91x33-wbB5juI5i8I8gX4bHmn</recordid><startdate>20221001</startdate><enddate>20221001</enddate><creator>Chen, Shong-Loong</creator><creator>Tsai, Yi-Hao</creator><creator>Zhang, Xiao-Ling</creator><creator>Tang, Chao-Wei</creator><creator>Hsu, Yu-Yun</creator><general>MDPI AG</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FH</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KB.</scope><scope>LK8</scope><scope>M7P</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><orcidid>https://orcid.org/0000-0002-1293-8288</orcidid><orcidid>https://orcid.org/0000-0001-7930-0740</orcidid></search><sort><creationdate>20221001</creationdate><title>Numerical Analysis of the Vertical Crown Displacements in Triple Adjacent Tunnels with Rock Bolts and Pipe Roofings</title><author>Chen, Shong-Loong ; 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The limited space available during excavation resulted in the formation of triple adjacent tunnels. To solve the issue of narrow spacing between the tunnels, middle posts were added for greater stiffness, and pipe roofings were installed to prevent collapse in tunnel sections with shallow overburden where the rock weathering was significant. PLAXIS 3D 2018, a finite element analysis program, was used to simulate the wall rock displacement during the bench cuts with pipe roofings and rock bolts installed. In addition, the difference between the presence and absence of bias pressure was studied. It was found that, in the absence of bias pressure, the tensile and compressive forces were symmetric from side to side. However, under bias pressure, the tensile force remained unchanged. Moreover, the compressive force under bias pressure was three times greater than without bias pressure and was concentrated at the sidewall of the eastbound tunnel and the crown of the mass rapid transit (MRT) tunnel. The results may be helpful for the design and construction of multiple adjacent tunnels in the future.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/pr10102062</doi><orcidid>https://orcid.org/0000-0002-1293-8288</orcidid><orcidid>https://orcid.org/0000-0001-7930-0740</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Analysis Bias Equilibrium Excavation Finite element analysis Finite element method Geology Light rail transportation Numerical analysis Overburden Pipes Pressure Rock bolts Roofing Simulation Stiffness Tunnel construction Tunnels |
| title | Numerical Analysis of the Vertical Crown Displacements in Triple Adjacent Tunnels with Rock Bolts and Pipe Roofings |
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