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7.4.1 For the excavation gradient of the side slopes and front slopes of the open channel，open tunnel and tunnel portal section，one cross-section shall be checked every 20m.The excavation gradient of the side slopes and front slopes shall not be more than the designed values.
7.4.2 The strength of the masonry mortar and concrete shall comply with the design requirements.
7.4.3 Before the foundation of the open tunnel and the retaining structure is constructed，the foundation subsoil shall be checked according to the design requirements.
7.4.4 The cross-section dimension errors and inspection methods of retaining walls shall comply with the requirements in Table 7.4.4.
Table 7.4.4 Cross-section dimension errors and inspection methods of retaining wall
7.4.5 The rockbolting and shotcreting support shall comply with the requirements in Chapter 10 of this code.
7.4.6 The allowable deviations and inspection methods for dimensions of side slopes，front slopes and retaining structure foundation pit of open channels shall comply with the requirements in Table 7.4.6.
Table 7.4.6 Allowable deviations and inspection methods for dimensions of side slopes，front slopes and retaining structure foundation pit of open channels
7.4.7 The construction quality and inspection methods of the water interception ditches above open channels and water ditches in tunnels shall comply with the requirements in Table 7.4.7.
Table 7.4.7 Construction quality and inspection methods of water interception ditches above open channels and water ditches in tunnels
Table 7.4.7（continued）
7.4.8 The dimensions and strengths of the concrete support structures of the tunnel portal sections shall comply with the requirements in Chapter 10 of this code.