地下工程降水及基坑支護施工方案.doc

1 工程概況
本工程位于西安市三付灣，華清路與長纓路交口的西北角，基坑深
度11.20m。
基坑邊界條件：基坑東邊線距華清路約20m；南側距長纓路lOm；北
側距2 層民房3～8m；距基坑西北角約1 5～20m 處有一幢8 層住宅樓：
基坑西側邊線距3 層客運站3～4m，本基坑的坡道準備留于基坑西側。其
平面位置見圖1/3。
支護范圍內土層情況：本場地地層情況詳見《巖土工程勘察報告書》。
各層土的主要物理力學指標詳見表l。
支護土層計算參數 表1
指標
指標值
層號
厚度(m) 深度(m) Y(kN/m3) C（kPa） φ(°)
①人工填土 1.5 1.5 17.00 10.00 l5.00
②黃土 2.8 4.3 16.80 25.00 21.00
③黃土 7.5 11.8 18.30 21.00 12.00
④古土 層 3.O 14.8 18.50 35.00 18.00
陜西儲備物資管理局職工培訓中心基坑大致呈長方形為71.6m×
33.1m，開挖深度約11.2m；基坑支護采用放坡（1∶0.2）＋土釘墻支護。
基坑底總邊長約為209m。支護范圍內土層主要為黃土類土，地下水位埋
深5.50m，根據勘察報告提供及地區經驗，降

1 Project Overview
The project is located in Xi'an three pay Bay, Hua Qing Road and the northwest corner of Long Ying Road intersections, deep pit
Degree of 11.20m.
Excavation boundary conditions: the east line of pit road from the Chinese Qing Dynasty about 20m; south from Chang Ying Lu lOm; North
Side from the 2nd floor houses 3 ~ 8m; from the northwest corner of the pit is about 1 5 ~ 20m Department has an 8-floor residential buildings:
Pit from the west sideline Layer 3 Terminal 3 ~ 4m, the excavation of the ramp are prepared to stay in the west pit. Its
Flat position shown in Figure 1 / 3.
Support within the soil: The detailed geological conditions of the site, "Geotechnical Engineering Investigation Report."
The main layers of soil physical and mechanical indicators shown in Table l.
Support calculation of soil parameters in Table 1
Index
Index value
Layer No.
Thickness (m) Depth (m) Y (kN/m3) C (kPa) φ (°)
① artificial fill 1.5 1.5 17.00 10.00 l5.00
② loess 16.80 25.00 21.00 2.8 4.3
③ loess 7.5 11.8 18.30 21.00 12.00
④ ancient soil layer 3.O 14.8 18.50 35.00 18.00
Shaanxi stockpile Authority staff training centers roughly rectangular pit is 71.6m ×
33.1m, excavation depth of approximately 11.2m; foundation pit with sloping (1:0.2) + soil nailing wall.
The total length of the bottom side of pit to 209m. Support within the soil is mainly loess type soil, underground water table
Depth 5.50m, according to investigation reports and regional experience, drop

前往下載