Measuring method for ultimate bearing capacity of foundations
A technology of ultimate bearing capacity and measurement method, which is applied in the field of foundation soil survey, basic structure engineering, construction, etc., can solve the problems of calculating the stratum, not grasping the direct relationship between detection force and bearing capacity, inaccuracy, etc., to achieve Analysis and calculation methods have the effects of diversity and breadth of analysis and calculation methods, and simple application methods
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example 1
[0056] Example 1: A heavy object with a weight of 100 kg falls freely to the ground from a height of 10 meters, which impacts the topsoil on the ground and forms a crater on the ground. The depth of the crater is 0.22 meters, and the impact area is 0.02 meters 2 , The impact time is 0.005 seconds. Analyze the solidity and bearing capacity of the surface strata.
[0057] Example 1 Analysis and Calculation: It is known that the detection force on the surface formation is The amount of the acting substance is m=100 kg, and the falling time of the heavy object is The time for the heavy object to act on the surface formation is t=0.05 seconds, and the initial velocity of the heavy object when it impacts the surface formation is v 0 =gt 0 =196=14(m / s), the pit depth x=0.22m, the impact area s=0.02m 2 , the impact force is
[0058]
[0059] During the impact time, the free fall distance that the weight should produce is
[0060]
[0061] The vanity of the surface strat...
example 2
[0068] Example 2: Using a static pressure detection device controlled by a small drilling rig to detect the nature and bearing capacity of the formation, the detection device is such as figure 1 shown. The probe is a high-strength solid alloy steel column with a diameter of 6cm, that is, the contact area between the probe and the formation is s=0.03 2 π = 0.002826 meters 2 , the pressure is provided by the booster hammer. This device was used to probe the properties and bearing capacity of a clay layer. During the detection process, a 400-kg heavy hammer is used as static pressure, and the probe sinks slowly at a sinking speed of 0.8 m / s. From this test result, we can directly determine the nature and bearing capacity of the detected formation. Please analyze and calculate the solidity and bearing capacity of the formation.
[0069] Example 2 analysis and calculation: the detection results give the following known data: detection force 400 kg, sinking amount per second 0....
example 3
[0074] Example 3: Calculate the solidity and ultimate bearing capacity of the detected stratum by using the actual standard penetration hit number of the formation, the standard penetration hit number of the standard compact rock formation, and the detection force. For example, in a survey project, the number of standard penetration strikes in a soil layer is 9 strikes / 30cm, and the impact force produced by standard penetration is The 30cm blow number of standard dense formation is N 0 =1055, please calculate the ultimate bearing capacity of the formation.
[0075] Solution: The solidity of the detected formation is
[0076] T = N N 0 = 9 1055 = 0.00853080569
[0077] The ultimate bearing capacity of the detected formation is
[0078]
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