深基坑护坡方案（Slope protection scheme for deep foundation pit）.docVIP

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深基坑护坡方案（Slope protection scheme for deep foundation pit）.doc

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深基坑护坡方案（Slope protection scheme for deep foundation pit）

深基坑护坡方案（Slope protection scheme for deep foundation pit） Abstract: This paper introduces a project through the deep foundation pit support scheme selection, support design, support construction and other aspects of effective measures, so as to ensure the quality of the project and construction safety successful experience. Key words: deep foundation pit; support; design; construction 1 project overview The project is located in the city center, north to the citys main avenue, south of a survey and Design Institute, east of a company dormitory area, West and adjacent to a Xinhua Bookstore, covers an area of 16526m2, total construction area of 130000m2, for the 33 storey main building, high 99.80m, located in the room under the two layer of foundation pit the depth is 9.80m, the groundwater depth between 5.40 ~ 8.70m. Overview of 2 site engineering geological conditions The soil layer is from top to bottom: 2.1 artificial soil (Qml): mainly for miscellaneous heap of soil, is mainly composed of old soil, clay, gravel, bricks, etc., with hard impurity 30%, complex composition, density inhomogeneity, structure is compact, the layer thickness is 0.80 ~ 5.50m. 2.2 quaternary silt (Q14) silty silty clay II: gray brown, saturated, soft plastic to flow plastic state, with odor, shaking, no reaction, cut slightly smooth, sporadic distribution, layer thickness 1 ~ 1.70m. 2.3 quaternary alluvial silty clay layer (Qal) 3: yellow brown, brown red, grey and white clip, a textured, slightly wet to wet, hard plastic to hard, uneven containing 5 ~ 15% fine sand, the thickness of 2.20 ~ 8.80m. 2.4 silty clay: Brown and yellow, the bottom layer gradually transition to silty soil, slightly wet, can be hard to plastic state, the thickness of 0.60 ~ 4.30m. 2.5 gravel sand, yellow, brown, yellow, quartz, containing about 10 to 25% of the round gravel, saturated, medium state, layer thickness of 0.30 ~ 3.00m. The 2.6 pebble; yellow, brown yellow, saturated, dense, uneven sand and clay contai