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Construction and protection method for tunnel portal of shallow-buried bias weak surrounding rock in alpine region
The invention discloses a construction and protection method for a tunnel portal of a shallow-buried bias weak surrounding rock in an alpine region. The method comprises the following steps that 1, grouting reinforcement is conducted on the surrounding rock (soil body) through a portal roof; 2, an open cut tunnel foundation pit is excavated for slope net hanging shotcrete-anchor supporting; 3, drilling or hole digging is conducted, and a reinforcement cage is placed in a pile hole for concrete pouring; 4, a profile steel arch frame is erected, guide wall steel bars are bound, and concrete is constructed in a molded mode; 5, a large pipe shed is installed for grouting, and a reinforced concrete open cut tunnel structure is constructed in a molded mode; 6, the open cut tunnel foundation pit is subjected to layered filling, and the ground surface is restored to original soil; and 7, a subsurface excavation section is excavated through a temporary inverted arch three-step. According to the method, the ground surface grouting, the advanced large pipe shed, a guide wall and the open cut tunnel structure are combined to form an overall portal supporting structure, a soft soil body section of a portal slope can be reinforced and supported, and slope collapse, collapse and roof caving in a tunnel, cracking and overturning of the guide wall and initial lining invasion or collapse in the excavation process are avoided.
本发明公开了一种高寒区浅埋偏压软弱围岩隧道洞口施工及防护方法，所述方法包括如下步骤：步骤一、通过洞顶对围岩（土体）进行注浆加固；步骤二、开挖明洞基坑进行边坡挂网喷锚支护；步骤三、钻孔或挖孔，桩孔内下钢筋笼灌注混凝土；步骤四、架设型钢拱架，绑扎导向墙钢筋并模筑混凝土；步骤五、安装大管棚注浆，模筑钢筋混凝土明洞结构；步骤六、明洞基坑分层填筑，地表恢复原土；步骤七、暗挖段采用临时仰拱三台阶开挖。该方法通过地表注浆、超前大管棚、导向墙和明洞结构相结合形成整体洞口支护结构，能够对洞口边坡软弱土体段进行加固支护，避免开挖过程出现边坡滑塌、洞内的塌方与冒顶、导向墙的开裂与倾覆和初期衬砌侵限或垮塌。
Construction and protection method for tunnel portal of shallow-buried bias weak surrounding rock in alpine region
The invention discloses a construction and protection method for a tunnel portal of a shallow-buried bias weak surrounding rock in an alpine region. The method comprises the following steps that 1, grouting reinforcement is conducted on the surrounding rock (soil body) through a portal roof; 2, an open cut tunnel foundation pit is excavated for slope net hanging shotcrete-anchor supporting; 3, drilling or hole digging is conducted, and a reinforcement cage is placed in a pile hole for concrete pouring; 4, a profile steel arch frame is erected, guide wall steel bars are bound, and concrete is constructed in a molded mode; 5, a large pipe shed is installed for grouting, and a reinforced concrete open cut tunnel structure is constructed in a molded mode; 6, the open cut tunnel foundation pit is subjected to layered filling, and the ground surface is restored to original soil; and 7, a subsurface excavation section is excavated through a temporary inverted arch three-step. According to the method, the ground surface grouting, the advanced large pipe shed, a guide wall and the open cut tunnel structure are combined to form an overall portal supporting structure, a soft soil body section of a portal slope can be reinforced and supported, and slope collapse, collapse and roof caving in a tunnel, cracking and overturning of the guide wall and initial lining invasion or collapse in the excavation process are avoided.
本发明公开了一种高寒区浅埋偏压软弱围岩隧道洞口施工及防护方法，所述方法包括如下步骤：步骤一、通过洞顶对围岩（土体）进行注浆加固；步骤二、开挖明洞基坑进行边坡挂网喷锚支护；步骤三、钻孔或挖孔，桩孔内下钢筋笼灌注混凝土；步骤四、架设型钢拱架，绑扎导向墙钢筋并模筑混凝土；步骤五、安装大管棚注浆，模筑钢筋混凝土明洞结构；步骤六、明洞基坑分层填筑，地表恢复原土；步骤七、暗挖段采用临时仰拱三台阶开挖。该方法通过地表注浆、超前大管棚、导向墙和明洞结构相结合形成整体洞口支护结构，能够对洞口边坡软弱土体段进行加固支护，避免开挖过程出现边坡滑塌、洞内的塌方与冒顶、导向墙的开裂与倾覆和初期衬砌侵限或垮塌。
Construction and protection method for tunnel portal of shallow-buried bias weak surrounding rock in alpine region
一种高寒区浅埋偏压软弱围岩隧道洞口施工及防护方法
LING XIANCHANG (author) / LIU JIAXIANG (author) / YU YUAN (author) / TANG LIANG (author) / HAN XIAO (author) / MA PENGHUI (author)
2021-04-16
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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