A method for selecting dynamic compaction machinery equipment near subways or tunnels

Abstract

The present invention discloses a method for selecting dynamic compaction mechanical equipment near a subway or a tunnel. The method first obtains exploration data of a construction area and adjacent areas through geological exploration, and establishes a three-dimensional geological model based on the exploration data, analyzes the compressive stress of adjacent buildings / structures, and obtains the calculated value of the compressive stress of adjacent buildings / structures, and verifies the proposed dynamic compaction mechanical equipment and the established three-dimensional geological finite element analysis model, and finally obtains the dynamic compaction mechanical equipment that meets the verification, and the selected dynamic compaction mechanical equipment can not only ensure the compaction effect of the foundation, but also avoid the stress damage generated during the dynamic compaction to affect or damage the adjacent buildings / structures.

Description

Technical Field

[0001] The invention relates to a method for selecting a type of dynamic compaction mechanical equipment near a subway or a tunnel, and belongs to the technical field of building construction. Background Art

[0002] When the compaction machinery is actually used for construction, there are often not many buildings / structures around, but the construction environment on site is abrupt. If there are pipelines, submarine tunnels, subways and other buildings / structures around the project, if the compaction machinery energy level is conservatively selected during the compaction construction, the compaction effect of the foundation cannot be guaranteed. If the compaction machinery energy level is aggressively selected, it cannot be guaranteed whether the stress generated during construction will affect or damage the nearby buildings / structures. Summary of the invention

[0003] The purpose of the present invention is to provide a method for selecting compaction mechanical equipment near a subway or tunnel, which can not only ensure the compaction effect of the foundation, but also avoid the stress failure generated during the compaction from affecting or damaging the nearby buildings / structures.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: a method for selecting a compaction mechanical equipment near a subway or a tunnel, comprising the following steps:

[0005] S101: Conduct geological survey on the construction area to obtain corresponding survey data;

[0006] S102: Establish a three-dimensional geological model of the construction area and the adjacent area based on the survey data;

[0007] S103: Analyze the compressive stress of adjacent buildings / structures and obtain the calculated value of the compressive stress of adjacent buildings / structures;

[0008] S104: establishing a three-dimensional geological finite element analysis model, establishing a dynamic compaction construction finite element analysis model based on the three-dimensional geological finite element analysis model, and then determining the energy level required for soil compaction based on the dynamic compaction construction finite element analysis model;

[0009] S105: Select compaction machinery and equipment based on the comparison of the compressive stress of nearby buildings / structures and the energy level required for soil compaction.

[0010] Furthermore, in the finite element analysis model of dynamic compaction construction, the foundation can be regarded as a semi-infinite domain, the building / structure to be calculated can be regarded as the stress boundary, and it is assumed that the hammer bottom stress is uniformly distributed, and the finite element analysis model of dynamic compaction construction is analyzed using an axisymmetric model.

[0011] Furthermore, in the finite element analysis model of dynamic compaction construction, when the dynamic compaction machinery and equipment are under construction, if the soil is elastically deformed, a constitutive relationship of elastic porous media is established, and changes in stress, displacement and pore pressure in the foundation should be considered in the constitutive relationship.

[0012] Furthermore, the surrounding environment of the construction area is supplemented by survey, and analysis is performed based on the geological survey data obtained, the composition of each geological layer is analyzed and named and numbered, the compressive stress, structural form, structural bearing capacity, structural size of nearby buildings / structures, and the distance between the buildings / structures and the compaction machinery are obtained, and the obtained information is input into the three-dimensional geological finite element analysis model to optimize the three-dimensional geological finite element analysis model.

[0013] Due to the adoption of the above technical scheme, the present invention has the following advantages: the present invention first obtains the survey data of the construction area and the adjacent area through geological survey, and establishes a three-dimensional geological model based on this, analyzes the compressive stress of the adjacent buildings / structures, and obtains the calculated value of the compressive stress of the adjacent buildings / structures, and verifies the proposed compaction machinery and equipment and the established three-dimensional geological finite element analysis model, and finally obtains the conforming compaction machinery and equipment based on the verification, and the selected compaction machinery and equipment can not only ensure the compaction effect of the foundation, but also avoid the stress damage caused by the compaction to affect or damage the adjacent buildings / structures. DETAILED DESCRIPTION

[0014] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0015] An embodiment of the present invention: A method for selecting a compaction mechanical device near a subway or a tunnel, comprising the following steps:

[0016] S101: Conduct geological survey on the construction area to obtain corresponding survey data;

[0017] S102: Establish a three-dimensional geological model of the construction area and the adjacent area based on the survey data;

[0018] S103: Analyze the compressive stress of adjacent buildings / structures and obtain the calculated value of the compressive stress of adjacent buildings / structures;

[0019] S104: establishing a three-dimensional geological finite element analysis model, establishing a dynamic compaction construction finite element analysis model based on the three-dimensional geological finite element analysis model, and then determining the energy level required for soil compaction based on the dynamic compaction construction finite element analysis model;

[0020] S105: Select compaction machinery and equipment based on the comparison of the compressive stress of nearby buildings / structures and the energy level required for soil compaction.

[0021] Furthermore, in the finite element analysis model of dynamic compaction construction, the foundation can be regarded as a semi-infinite domain, the building / structure to be calculated can be regarded as the stress boundary, and it is assumed that the hammer bottom stress is uniformly distributed, and the finite element analysis model of dynamic compaction construction is analyzed using an axisymmetric model.

[0022] Furthermore, in the finite element analysis model of dynamic compaction construction, when the dynamic compaction machinery and equipment are under construction, if the soil is elastically deformed, a constitutive relationship of elastic porous media is established, and changes in stress, displacement and pore pressure in the foundation should be considered in the constitutive relationship.

[0023] Furthermore, the surrounding environment of the construction area is supplemented by survey, and analysis is performed based on the geological survey data obtained, the composition of each geological layer is analyzed and named and numbered, the compressive stress, structural form, structural bearing capacity, structural size of nearby buildings / structures, and the distance between the buildings / structures and the compaction machinery are obtained, and the obtained information is input into the three-dimensional geological finite element analysis model to optimize the three-dimensional geological finite element analysis model.

[0024] The present invention first obtains the survey data of the construction area and the adjacent area through geological survey, and establishes a three-dimensional geological model based on this, analyzes the compressive stress of the adjacent buildings / structures, and obtains the calculated value of the compressive stress of the adjacent buildings / structures, and verifies the proposed dynamic compaction mechanical equipment and the established three-dimensional geological finite element analysis model, and finally obtains the dynamic compaction mechanical equipment that meets the verification. The selected dynamic compaction mechanical equipment can not only ensure the compaction effect of the foundation, but also avoid the stress damage caused by the dynamic compaction to affect or damage the adjacent buildings / structures. The present invention has two main aspects. One is that the calculated value of the compressive stress of the adjacent buildings / structures should take into account various unfavorable factors, and the calculated value should be accurate; the other is that the three-dimensional geological finite element analysis model should select appropriate soil unit equilibrium equations, constitutive equations and geometric equations. Finally, the calculated energy level required for the land dynamic compaction and the compressive stress value of the adjacent buildings / structures are compared, and the dynamic compaction equipment with the required energy level is selected.

Claims

1. A method for selecting dynamic compaction mechanical equipment near a subway or tunnel, characterized in that The following steps are involved: S101: Conduct geological survey on the construction area to obtain corresponding survey data; S102: Establish a three-dimensional geological model of the construction area and the adjacent area based on the survey data; S103: Analyze the compressive stress of adjacent buildings / structures and obtain the calculated value of the compressive stress of adjacent buildings / structures; S104: establishing a three-dimensional geological finite element analysis model, establishing a dynamic compaction construction finite element analysis model based on the three-dimensional geological finite element analysis model, and then determining the energy level required for soil compaction based on the dynamic compaction construction finite element analysis model; S105: Select the compaction machinery and equipment based on the comparison of the compressive stress of the adjacent buildings / structures and the energy level required for soil compaction; In the finite element analysis model of dynamic compaction construction, the foundation can be regarded as a semi-infinite domain, the building / structure to be calculated can be regarded as the stress boundary, and it is assumed that the stress at the bottom of the hammer is uniformly distributed. The finite element analysis model of dynamic compaction construction is analyzed using an axisymmetric model to obtain the path and range of the transmission of the vibration wave generated during the dynamic compaction construction, so as to determine the energy level required for soil compaction.

2. The method for selecting a compaction mechanical equipment near a subway or tunnel according to claim 1 is characterized in that: In the finite element analysis model of dynamic compaction construction, when the dynamic compaction machinery and equipment are under construction, if the soil is elastically deformed, the constitutive relationship of the elastic porous medium is established to analyze the soil to obtain the calculated value of the soil compressive stress. The changes in the internal stress, displacement and pore pressure of the foundation should be considered in the constitutive relationship.

3. The method for selecting a compaction mechanical equipment near a subway or tunnel according to claim 1, characterized in that: Conduct additional surveys on the surrounding environment of the construction area, analyze the geological survey data obtained, analyze the composition of each geological layer and name and number it, obtain the compressive stress, structural form, structural bearing capacity, structural size of nearby buildings / structures, and the distance between the buildings / structures and the compaction machinery, and input the obtained information into the three-dimensional geological finite element analysis model to optimize the three-dimensional geological finite element analysis model.