wo parallel road tunnels are being constructed for 6 lanes in the basalts. The are D-shaped with diameter (B) of around 16 m and 2 m high side walls with ing of 20 m. The maximum overburden (H) is 165 m. The rock mass parameters R=73, Q = 10, Ja = 1.0, Jr = 3.0 and Jw = 1.0 (minor seepage from side walls). truction engineers want rapid rate of tunnelling and life of support system shoul years. The uniaxial compressive strength of SFRS is 30 MPa and its flexural stre 7140
wo parallel road tunnels are being constructed for 6 lanes in the basalts. The are D-shaped with diameter (B) of around 16 m and 2 m high side walls with ing of 20 m. The maximum overburden (H) is 165 m. The rock mass parameters R=73, Q = 10, Ja = 1.0, Jr = 3.0 and Jw = 1.0 (minor seepage from side walls). truction engineers want rapid rate of tunnelling and life of support system shoul years. The uniaxial compressive strength of SFRS is 30 MPa and its flexural stre 7140
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
![Two parallel road tunnels are being constructed for 6 lanes in the basalts. The tun-
nels are D-shaped with diameter (B) of around 16 m and 2 m high side walls with clear
spacing of 20 m. The maximum overburden (H) is 165 m. The rock mass parameters are,
RMR = 73, Q = 10, Ja=1.0, Jr = 3.0 and Jw = 1.0 (minor seepage from side walls). The
construction engineers want rapid rate of tunnelling and life of support system should be
100 years. The uniaxial compressive strength of SFRS is 30 MPa and its flexural strength
is 3.7 MPa.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5c61a537-aba0-410b-a1aa-61950103425b%2F05e3f420-fec7-45fe-82e7-abc53e11b490%2Fdjsn5rv_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Two parallel road tunnels are being constructed for 6 lanes in the basalts. The tun-
nels are D-shaped with diameter (B) of around 16 m and 2 m high side walls with clear
spacing of 20 m. The maximum overburden (H) is 165 m. The rock mass parameters are,
RMR = 73, Q = 10, Ja=1.0, Jr = 3.0 and Jw = 1.0 (minor seepage from side walls). The
construction engineers want rapid rate of tunnelling and life of support system should be
100 years. The uniaxial compressive strength of SFRS is 30 MPa and its flexural strength
is 3.7 MPa.
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