Construction method for controlling peripheral ground subsidence in foundation pit construction

A technology of surface settlement and construction method, which is applied in the direction of basic structure engineering, excavation, soil protection, etc., can solve problems that are difficult to popularize, and achieve the effect of simple method, control of surrounding surface settlement, and guarantee of construction quality

Inactive Publication Date: 2010-05-05
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, this method is mainly used in medium-sized foundation pits such as subway station working wells, and due to the use of information-based construction methods, it is difficult to popularize under the existing conditions

Method used

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  • Construction method for controlling peripheral ground subsidence in foundation pit construction
  • Construction method for controlling peripheral ground subsidence in foundation pit construction
  • Construction method for controlling peripheral ground subsidence in foundation pit construction

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Experimental program
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Embodiment

[0024] according to figure 1 As shown in the process, the implementation process of this embodiment is as follows:

[0025] Step 1, on-site geological survey: According to the design excavation depth of the foundation pit is 15 meters, the geology is divided into 5 layers within the scope of engineering influence, respectively, the first layer of plain fill is 4 meters thick, the cohesion is 2kPa, and the internal friction angle is 20 degrees , the gravity is 16kN / m 3 ;The second layer of silt is 4 meters thick, the internal friction angle is 23 degrees, and the gravity is 17kN / m 3 ; The third layer of clay is 10 meters thick, the cohesion is 4kPa, the internal friction angle is 10 degrees, and the gravity is 16kN / m 3 ; The fourth layer of sandy soil is 5 meters, the internal friction angle is 30 degrees, and the gravity is 17kN / m 3 ; The fifth layer of clay extends beyond the area of ​​influence of the project. The first layer of confined aquifer is in the fourth layer of...

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Abstract

The invention discloses a construction method for controlling peripheral ground subsidence in foundation pit construction and belongs to the technical field of construction works. The construction method comprises the following steps of: drilling holes and taking soil on site for dividing soil layers; determining a top plate and the high level of a bottom plate of each layer of soil; determining depth Dw of the bottom plate of a first layer of confined aquifer and determining distribution and type of underground water; taking soil samples of all soil layers, and determining c values, j values and saturated unit weight g of all the soil samples; leveling a construction site and reinforcing in a way of high-pressure jet grouting; determining an embedding depth of a diaphragm wall; trenching in a foundation to reach the embedding depth of the diaphragm wall in the step 3, and then getting rid of sludge; putting steel reinforcement cages and pouring concrete in the trenches, and connecting all sections of trenches by joints to obtain a reinforced concrete diaphragm wall. The method is simple and can ensure the construction quality of diaphragm walls and can effectively control the peripheral ground subsidence.

Description

technical field [0001] The invention relates to a construction method in the technical field of construction engineering, in particular to a construction method for controlling the settlement of surrounding ground surfaces during foundation pit construction. Background technique [0002] With the continuous development of our country's economy, the road traffic construction in the eastern coastal areas has been continuously improved. Today, as ground traffic becomes more and more congested, a large number of underground transportation facilities have been built in coastal soft soil areas. Therefore, foundation pit engineering has also become a new hot spot in the construction of coastal economically developed cities. More and more ultra-large and ultra-deep foundation pits appear in cities, and how to effectively control the surrounding surface settlement has become a key issue during the construction of foundation pits. At present, the commonly used method for the constru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E02D3/12E02D5/46E02D5/18
Inventor 马磊沈水龙罗春泳孙文娟
Owner SHANGHAI JIAO TONG UNIV
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