基坑支護綜合處理技術.rar

摘要：在充分利用已有支護樁的情況下，根據基礎各部位開挖深度的不同，采取卸荷和不同的臨時斜撐及加強被動區等措施，達到了施工周期短、投資少和保證基坑及周邊建筑安全的目的。
關鍵詞：基坑支護 卸荷 支頂斜撐
1 工程概況
某建筑位于太原市汾河東側500 m。該工程地下1層，地上15層，建筑面積11 000 m2，鋼筋混凝土框架剪力墻結構。采用Φ800 mm鋼筋混凝土灌注樁，1 500 mm厚條形承臺基礎，承臺基礎用400 mm厚構造筏板(筏板下設300 mm厚干爐渣)相連，基礎頂標高-5.13 m，平面尺寸43.8 m×19 m。構造筏板干爐渣底標高-6.00 m，承臺墊層底標高-6.80 m，電梯基坑處局部-8.37 m，室內外高差0.9 m，自然地坪為-1.06～-1.6 m。施工前期，鋼筋混凝土灌注樁和基坑支護帷幕樁已相繼施工完成。
1．1 工程水文地質條件 工程場地土自上而下依次為：
Abstract: In the full use of existing support piles of cases, depending on the basis of all the different parts of the excavation depth, take a different unloading and temporary bracing and strengthening the passive area and other measures to achieve the short construction period, less investment and guarantee foundation and surrounding buildings security.
Keywords: foundation pit bracing the top of unloading branch
1 Project Overview
The east side of a building located in Fenhe 500 m. The Underground 1 floor, 15 floors, construction area of 11 000 m2, reinforced concrete frame structure. With Φ800 mm reinforced concrete pile, 1 500 mm thick strip pile foundation, pile foundation constructed with 400 mm thick raft (raft consists of 300 mm thick dry slag) is connected, based on the top level -5.13 m, plane size 43.8 m × 19 m. Tectonic plate on the end of dry slag level -6.00 m, cap cushion bottom elevation -6.80 m, elevator pit Department Local -8.37 m, indoor and outdoor elevation 0.9 m, the natural floor is -1.06 ~ -1.6 m. Pre-construction, reinforced concrete pile and the pile foundation pit curtain construction has been completed one after another.
1.1 Hydrogeological conditions in site soil from the top down as follows:
 

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