A.12% B.l7% C.22% D.25%
A.≥93% B.≥94% C.≥95% D.≥96%
A.隧道開(kāi)挖后立即襯砌支護(hù) B.隧道開(kāi)挖后經(jīng)監(jiān)測(cè),經(jīng)驗(yàn)類比和計(jì)算分析適時(shí)襯砌支護(hù) C.隧道開(kāi)挖后,讓圍巖充分回彈后再襯砌支護(hù) D.隧道襯砌后,要使隧道圍巖中的應(yīng)力接近于原地應(yīng)力