Effect behaviors of caves on tunneling in karst area
lei jin-shan1; su feng2; yang jun-sheng1; chen fu-quan2; zhou can-lang3(1.school of civil and architectural engineering; central south university; changsha 410075; china; 2.college of civil engineering; fuzhou university; fuzhou 350002; china; 3.guangzhou metro design academe; guangzhou 510010; china)
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