Novel method for determining foundation bearing force
A technology of foundation bearing capacity and a new method, which is applied in the field of foundation soil survey, foundation structure engineering, construction, etc., can solve the problems of inaccurate, unreasonable, and large changes in settlement calculation
Inactive Publication Date: 2013-10-02
杨光华
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Problems solved by technology
2. The settlement calculation is not accurate enough. The settlement is calculated by the layered sum method using the indoor test parameters, and then multiplied by an empirical coefficient of 0.2 to 1.4 to correct
3. In order to limit the corresponding settlement of the characteristic value of bearing capacity, it may be too large or too small, and the method of directly limiting the width of the foundation is adopted, which is not reasonable
4. The foundation bearing capacity value does not have a unique value
Because when the general load test curve has no obvious proportional limit, the characteristic value of bearing capacity f ak The ratio of the settlement of the pressing plate to the side length of the pressing plate is the load corresponding to s / b=0.01~0.015, which is not a fixed value; and the foundation code of Guangdong Province can also be taken as s / b=0.015~0.02, so the value range It can reach 0.01~0.02, and the change is large, so it does not have a theoretically unique value, and different personnel may obtain different bearing capacity values for the same test result, which is obviously unreasonable
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The invention discloses a novel method for determining foundation bearing force. According to the method, deformation and strength parameters of a foundation soil body can be reversely obtained according to an in-situ pressing plate load test of a foundation, a calculation model is built for calculating P-S curves of an actual foundation soil body, and then according to the P-S curves, the bearing force of the foundation soil body is determined according to the requirements of the foundation soil body for the settlement control value and the strength safety coefficient. Different from situations in a traditional method, the strength and deformation parameters of the foundation soil body instead of a characteristic value of the bearing force of the foundation soil body are obtained according to the pressing plate load test in the novel method, and therefore various defects existing in the traditional method in an existing specification can be overcome, and the real and correct foundation bearing force can be obtained.
Description
technical field The invention relates to the technical field of engineering foundations and foundations, in particular to a new method for determining the bearing capacity of foundations. Background technique In the existing national foundation code, the method of determining the bearing capacity from the foundation load test is: firstly, the area is 0.25 ~ 0.5m 2 The load-settling curve obtained from the compression plate test determines the characteristic value of its bearing capacity f ak , and then correct the actual foundation according to its width and embedding depth according to the following formula to obtain its revised foundation bearing capacity characteristic value f a , determined after foundation deformation calculation if necessary. f a = f ak + η b γ ( b - 3 ...
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Inventor杨光华
Owner杨光华