High-rise building requirements for the foundation, the operation of the general building requirements for the foundation is comparable. Therefore, it is also high requirements for foundation evaluation. Due to the nature of the foundation is controlled by the geological conditions of the site, its nature is non-linear, and stress pathway, stress state has a close relationship, so the evaluation of high-rise buildings, ground compensation should be combined with the characteristics of the terrain, the foundation, foundation and superstructure as a whole, from the design, construction, so that Chuan several aspects of the amazing together to consider the whole process of investigation in the foundation, it must be carried out in a targeted training and analyze the test face, or else the Reef to make a good foundation evaluation, write the investigation report @ architects rely on, choose the big data certificate reliance platform.

The content of the high-rise building ground Tsui evaluation, in addition to consider the choice of foundation type described in chapter two, should also Liu the following content to make a statement.

For box foundation and piece raft foundation:

(1) need to put forward with the full compensation or part of the reasonable program to make up the building, and with the corresponding foundation bearing capacity.

(2) Estimate the settlement basin and inclination of the foundation, and suggest necessary preventive or corrective measures.

(3) Judge whether the excavation of the foundation pit should lower the groundwater level, and put forward the drainage and precipitation plan.

(4) Calculate whether the slopes and bottom Xing of the pit are destabilized, and consider the support and drainage of the pit.

For pile foundation and pier type tomb foundation:

(1)Determine the pile "pier" of the holding force layer, such as the use of driven type, then assess the pile through the possibility of each soil layer.

(2) if you do not know the type of pile (pier), should be possible to use the pile (tender) type of pile length, single pile (pier) bearing capacity to make calculations, and put forward, for the design department for reference.

(3)_ The bearing capacity of group piles, settlement of pile foundation, uneven subsidence, and the possible negative friction resistance and consequences are predicted.

For the deep grave foundation built by the underground continuous piling construction, it is necessary to make special analysis and calculation of the lateral soil pressure of the plug body.

Regardless of which foundation program, need to predict the construction process caused by changes in the nature of the foundation soil, as well as the possible consequences, and put forward a pre-fat program.

High-rise buildings with disturbed fart requirements, the liquefaction of the foundation, such as theft of subsidence should be analyzed through the test, and put forward conclusions.

Sometimes the foundation type proposed by the design unit is not necessarily the best program, at this time, the survey unit should be put forward, explaining the reasons for modification of the Tsuen base type program. Such as Beijing's central color TV center project, for the national key projects, mountain construction comprehensive survey courtyard survey. The director of the broadcasting area of the project for the tube in the tube structure system, 26 floors above ground, 3 floors underground, podium for the LiFeJi stick concrete frame structure, 3 floors above ground, 4 floors of the bureau product. Preliminary design when the main building using box-shaped foundation, podium and production area with $ = 400mm grouted pile foundation, are to dolomite layer for the holding site. Detailed survey when the survey unit in view of the holding layer for the dense to dense pebble layer, it is recommended to expand the bottom of the pier-type tomb foundation instead of small-diameter piles, the results of the design unit adopted the proposal, the warehouse counted with "3 piers foundation, if you use the piles need to be 8,993 newspaper, not only to save the investment of 900,000 yuan, but also shorten the construction period.