There were a few natural caves on the reverse slope.
背面坡上有几个天然的山洞。
Drainage in a reverse slope is the primary problem in the construction of a tunnel in a reverse-slope stratum with abundant water.
反坡富水岩溶隧道施工的主要难题是反坡抽排水，而快速有效地排除反坡施工地段的积水，对隧道的施工组织和现场管理影响重大。
Drainage in a reverse slope is the primary problem in the construction of a tunnel in a reverse-slope stratum with abundant water.
反坡富水岩溶隧道施工的主要难题是反坡抽排水，而快速有效地排除反坡施工地段的积水，对隧道的施工组织和现场管理影响重大。
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