陜西寶漢高速公路連城山隧道為雙向六車(chē)道分離式設(shè)計(jì)，左洞長(zhǎng)5779米，右洞長(zhǎng)5798米，屬高地應(yīng)力軟弱大變形圍巖條件下的特長(zhǎng)隧道。中交二公局承建了6272米（左洞長(zhǎng)3120米，右洞長(zhǎng)3152米）施工任務(wù)，標(biāo)段內(nèi)極軟巖高達(dá)40%，隧道最大開(kāi)挖寬度達(dá)19.6米，是陜西省貫通的首座雙向六車(chē)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.