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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

Active Publication Date: 2014-09-03
王昌益
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above detection, analysis, and calculation methods need a lot of manpower, material and financial resources, and their analysis and calculation methods are all based on stress-strain theory, strength theory, mathematical curve analysis, and empirical formulas. The law of the direct relationship between the bearing capacity, the property of the formation and the bearing capacity of the formation cannot be calculated according to the direct relationship formula between the detection force and the ultimate bearing capacity, which complicates the content of the detection experiment work, complicates the analysis and calculation work, and makes Analysis and calculation results are uncertain and inaccurate
In the analysis and calculation work, there are many irrelevant concepts and parameters involved, and the analysis and research work is complicated
Among them, the look-up table method for determining the bearing capacity is very simple, but it is often far from the actual bearing capacity value of the detected formation

Method used

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  • Measuring method for ultimate bearing capacity of foundations
  • Measuring method for ultimate bearing capacity of foundations
  • Measuring method for ultimate bearing capacity of foundations

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a measuring method for the ultimate bearing capacity of foundations, and belongs to the field of basic theories and applications of geotechnical engineering. Aiming at the insufficiencies that people are difficult to right understand the relationship rule between ultimate bearing capacity and detection capacity and are difficult to right measure two new parameters of solid and virtual degrees , the invention provides a new calculation formula as shown in the specification for the ultimate bearing capacity of the foundations, and a method for obtaining parameters in the formula is analyzed and researched, so that the measurement of the ultimate bearing capacity of the foundations has the characteristics of better theorization, systematization and formulation, automation and routinization can be combined for operation, and the advantages of the theorization, the formulation and the like of the method provided by the invention are brought into full play.

Description

technical field [0001] The invention relates to a method for measuring the ultimate bearing capacity of a foundation, which belongs to the field of basic theory and application of geotechnical engineering. Background technique [0002] The relationship between foundation bearing capacity and detection capacity is one of the most basic issues in classical mechanics and rock and soil mechanics. Whether the relationship between foundation bearing capacity and detection capacity can be correctly understood is the key to determining the detection, analysis and calculation of foundation bearing capacity. The key to scientific, accurate and reliable. [0003] At present, the methods for detecting, analyzing, and calculating the bearing capacity of the foundation are still mainly based on the following methods: a. Static sounding method: At present, the methods of determining the bearing capacity of the foundation by using static sounding sounding at home and abroad are both domesti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D1/00
Inventor 王昌益田丽杰
Owner 王昌益
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