Experimental Study On Application Of CFG Pile In Qingdao

Weathered rock distributes very widely in our country. It bears the following characteristics: the weathering depth varies in different places, mantle of rock are buried shallowly in Qingdao, the integrity is perfect, the stable degree is great, the compressibility is low, and supporting capacity is high, so often as a pile foundation bearing stratum . Previous studies used to be concentrated on the following aspects like the nature of the works of the CFG pile on a variety of special foundation,on the weathered rock foundation is less.By collecting and analysing a large amount of data and relevant literature, the author gives a brief account of former investigations in this field, and conducts a preliminary study on the nature of the works of the CFG pile in Qingdao based on field tests. The major productions are as follows:1. Throught experiments made about the vertical static load test of the CFG pile composite foundation of two sites in Laoshan district of Qingdao City: (1) mantle of rock are buried shallowly in Qingdao, the stable degree is great, the compressibility is low, and the CFG piles based on the weathered rock foundation are not pierced to the Under layer, just have a small settlement. (2) by static load test verification, more sparse pile can be used to meet the bearing capacity of the building in the CFG pile design, as is based on the weathered rock foundation.2. Throught experiments made about the vertical static load test of the soil and the CFG pile composite foundation of a certain Jiaozhou project: (1) In the calculations to the bearing capacity of the soil, it's need to conduct the depth of the amendment, when there is overload, the overload can be converted into soil thickness as a basis for depth. (2) According to the survey information, re-calculating the bearing capacity of the foundation soil, using the static loading test to check to the original design,the optimization for the project can save cost and the time limit.