陜西寶漢高速公路連城山隧道為雙向六車道分離式設(shè)計(jì)，左洞長5779米，右洞長5798米，屬高地應(yīng)力軟弱大變形圍巖條件下的特長隧道。中交二公局承建了6272米（左洞長3120米，右洞長3152米）施工任務(wù)，標(biāo)段內(nèi)極軟巖高達(dá)40%，隧道最大開挖寬度達(dá)19.6米，是陜西省貫通的首座雙向六車道極軟巖隧道。
　　The Mt. Liancheng Tunnel of Baoji-Hanzhong Expressway in Shaanxi Province is designed in two-way six-lane with its left hole of 5779m and right tunnel of 5798m. It is a super long tunnel under the condition of high ground stress weak and large deformation surrounding rock. CCCC Second Highway Engineering Co., Ltd. has contracted the construction task of 6272m (the left hole of 3120m and the right hole of 3152m). The maximum excavation width of the tunnel is 19.6m, which is the first two-way six-lane tunnel under super soft rock in Shaanxi Province.