CN219240651U - Pile driving confining pressure grading loading model test device - Google Patents

Pile driving confining pressure grading loading model test device Download PDF

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Publication number
CN219240651U
CN219240651U CN202320316843.7U CN202320316843U CN219240651U CN 219240651 U CN219240651 U CN 219240651U CN 202320316843 U CN202320316843 U CN 202320316843U CN 219240651 U CN219240651 U CN 219240651U
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China
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confining pressure
model
pile
test
loading plate
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CN202320316843.7U
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Inventor
杨钊
陈培帅
罗会武
喻成成
姬付全
邓志强
张瑞元
朱涛
曾旭涛
赵旭
朱俊涛
江鸿
李德杰
许超
刘朋飞
杨睿
杨林
任梦
李雪松
曹昂
于锦
饶为胜
杨俐
李孝斌
徐鹏
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CCCC Second Harbor Engineering Co
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CCCC Second Harbor Engineering Co
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

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  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The utility model discloses a pile driving confining pressure grading loading model test device, which is arranged in a test pit and comprises: the pile casing is arranged in the test pit, test soil is filled in the pile casing, and a confining pressure loading plate is placed on the test soil; the model pile is vertically buried in the test soil, and one end of the model pile extends out of the confining pressure loading plate; the reaction frame is arranged above the pile casing and is fixedly connected with the side wall of the test pit; the fixed end of the actuator is fixedly connected with the reaction frame, and the movable end of the actuator faces the model pile; the actuator and the model pile are coaxially arranged; the confining pressure loading device comprises jacks symmetrically arranged on two sides of the actuator, wherein fixed ends of the jacks are fixedly connected with the reaction frame, and movable ends face the confining pressure loading plate. The utility model can apply load on the surface of the model test soil to form confining pressure, and can simulate the earth stress of the deep part of the soil in a grading manner.

Description

Pile driving confining pressure grading loading model test device
Technical Field
The utility model relates to the technical field of geotechnical model tests. More particularly, the utility model relates to a pile driving confining pressure grading loading model test device.
Background
The model test is an important test method which uses a model similar to the prototype to carry out test research and applies the research result to the prototype, and the method has good economy, can control main test parameters not to be limited and influenced by environmental conditions, and is widely applied to the field of civil engineering test. However, in the existing pile driving model test, load cannot be applied to the surface of the soil body in the pile foundation penetration process to form confining pressure, so that actual ground stress at a deeper part of the soil body cannot be simulated. At present, a method for forming deep stress is lacking in test design, so that the application range of the test research of the driven pile model is limited, and therefore, a device capable of loading confining pressure in a grading manner in the test of the driven pile model is required to be designed.
Disclosure of Invention
It is an object of the present utility model to solve at least the above problems and to provide at least the advantages to be described later.
To achieve these objects and other advantages and in accordance with the purpose of the utility model, there is provided a driving pile confining pressure stage loading model test apparatus disposed in a test pit, comprising:
the pile casing is arranged in the test pit, test soil is filled in the pile casing, and a confining pressure loading plate is placed on the test soil;
the model pile is vertically buried in the test soil, and one end of the model pile extends out of the confining pressure loading plate;
the reaction frame is arranged above the pile casing and is fixedly connected with the side wall of the test pit;
the fixed end of the actuator is fixedly connected with the reaction frame, and the movable end of the actuator faces the model pile; the actuator and the model pile are coaxially arranged;
the confining pressure loading device comprises jacks symmetrically arranged on two sides of the actuator, wherein fixed ends of the jacks are fixedly connected with the reaction frame, and movable ends face the confining pressure loading plate.
Preferably, a force transmission column is arranged between any jack and the confining pressure loading plate, the force transmission column and the jack are coaxially arranged, and the bottom of the force transmission column is fixedly connected with the confining pressure loading plate.
Preferably, a pressure sensor is arranged between the movable end of the jack and the top of the force transmission column.
Preferably, the center of the casing, the center of the model pile and the center of the confining pressure loading plate are on the same straight line.
Preferably, the diameter of the confining pressure loading plate is the same as the inner diameter of the casing.
Preferably, a through hole through which the model pile can pass is formed in the center of the confining pressure loading plate.
The utility model at least comprises the following beneficial effects:
according to the pile driving confining pressure graded loading model test device, the jack is used for applying pressure to the confining pressure loading plate, and then the actuator is used for carrying out model pile penetration, so that the confining pressure can be formed by applying load on the surface of model test soil, the actual ground stress at the deeper part of the soil can be graded and simulated, uniform synchronous loading, symmetrical loading, graded loading and synchronous unloading of the confining pressure are realized, and the influence from the surrounding test environment is small, and the model test structural system and components are not disturbed.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.
Drawings
FIG. 1 is a schematic diagram of a model test apparatus according to the present utility model;
Detailed Description
The present utility model is described in further detail below with reference to the drawings to enable those skilled in the art to practice the utility model by referring to the description.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present utility model, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present utility model.
As shown in fig. 1, the present utility model provides a pile driving confining pressure stage loading model test apparatus provided in a test pit 1, comprising:
a casing 2, which is arranged in the test pit 1, wherein test soil 3 is filled in the casing 2, and a confining pressure loading plate 5 is placed on the test soil 3;
the model pile 4 is vertically embedded in the test soil 3, and one end of the model pile extends out of the confining pressure loading plate 5;
the reaction frame 10 is arranged above the pile casing 2 and is fixedly connected with the side wall of the test pit 1;
the fixed end of the actuator 9 is fixedly connected with the reaction frame 10, and the movable end of the actuator faces the model pile 4; the actuator 9 is coaxially arranged with the model pile 4;
the confining pressure loading device comprises jacks 8 symmetrically arranged on two sides of an actuator, wherein fixed ends of the jacks 8 are fixedly connected with a reaction frame 10, and movable ends face to the confining pressure loading plate 5.
In the technical scheme, the pile driving confining pressure grading loading model test device is arranged in the test pit 1, and the test pit 1 can be a rectangular test pit conventionally used in the technical field. The pile casing 2 can be a circular thin-wall pile casing, test soil 3 is filled in the pile casing 2 in layers, and the model piles 4 are pre-buried. And placing the confining pressure loading plate 5 on the surface of the test soil 3 through the model pile 4, and uniformly transmitting the pressure of the jack 8 to the test soil 3 in the casing 2 to form ground stress. The reaction frame 10 provides reaction force for piling the actuator 9 and applying confining pressure to the jack 8; in the test, firstly, pressure is applied to the confining pressure loading plate 5 through two jacks 8 at the same time, and then, pressure is applied to the model pile 4 through the actuator according to a set loading flow, so that the model pile 4 is penetrated; and confining pressure of different degrees is applied by the jack 8, and the bearing performance characteristics of the driven pile under different confining pressure working conditions are obtained according to the data of the actuator 9. Preferably, the jack 8 is a screw jack capable of sustaining temperature loading pressure.
In another technical scheme, a force transmission column 6 is arranged between any jack 8 and the confining pressure loading plate 5, the force transmission column 6 and the jack 8 are coaxially arranged, and the bottom of the force transmission column 6 is fixedly connected with the confining pressure loading plate 5. During the test, the force transmission column 6 with the adaptive length can be flexibly selected according to the length of the actuator 9, and the pressure of the jack 8 is transmitted to the confining pressure loading plate 5 through the force transmission column 6.
In another technical scheme, a pressure sensor 7 is arranged between the movable end of the jack 8 and the top of the force transmission column 6. The pressure of the jack 8 is monitored in real time by the pressure sensor 7, preferably, the pressure sensor 7 can be a spoke type pressure sensor, and the spoke type pressure sensor is placed at the top center position of the force transmission column 6 so as to accurately detect the pressure of the jack 8.
In another technical scheme, the center of the pile casing 2, the center of the model pile 4 and the center of the confining pressure loading plate 5 are on the same straight line so as to uniformly transfer the pressure of the jack 8 to the test soil 3.
In another technical scheme, the diameter of the confining pressure loading plate 5 is the same as the inner diameter of the casing 2, so that the confining pressure loading plate 5 is constrained by the casing 2 in the horizontal direction and keeps stable in bearing pressure.
Further, a through hole through which the model pile 4 can pass is formed in the center of the confining pressure loading plate 5.
The concrete application method of the pile driving confining pressure grading loading model test device comprises the following steps:
s1, after a model test device is installed in place, the jacks 8 on two sides are simultaneously pressurized to a first-stage load and stabilized for 30 minutes, and after the ground stress applied to the test soil 3 through the confining pressure loading plate 5 is stabilized, the actuator 9 is used for carrying out pile driving penetration flow;
s2, after pile driving penetration is completed under the condition of first-stage confining pressure, the model pile 4 is pulled out;
and S3, simultaneously pressurizing the jacks 8 on the two sides to a second-stage load, and repeating the step S1 and the step S2 until the pile driving penetrating process under the condition of the final-stage confining pressure is completed.
And S4, simultaneously releasing the pressure of the jacks 8 at the two sides to zero. And analyzing the test data of the actuator 9 to obtain the bearing performance characteristics of the driven pile under different confining pressure working conditions.
The pressure value calculation method of the jack 8 is as follows: the inner diameter of the protective cylinder 2 is D 0 Area is S 0 When the ground stress is required to be loaded, the stress is p n When in use, the jacks 8 on the left and right sides respectively need to exert force F n =(p n ·S 0 )/2。
Although embodiments of the present utility model have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the utility model would be readily apparent to those skilled in the art, and accordingly, the utility model is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

Claims (6)

1. The utility model provides a pile driving confining pressure classification loading model test device, sets up in experimental hole, its characterized in that includes:
the pile casing is arranged in the test pit, test soil is filled in the pile casing, and a confining pressure loading plate is placed on the test soil;
the model pile is vertically buried in the test soil, and one end of the model pile extends out of the confining pressure loading plate;
the reaction frame is arranged above the pile casing and is fixedly connected with the side wall of the test pit;
the fixed end of the actuator is fixedly connected with the reaction frame, and the movable end of the actuator faces the model pile; the actuator and the model pile are coaxially arranged;
the confining pressure loading device comprises jacks symmetrically arranged on two sides of the actuator, wherein fixed ends of the jacks are fixedly connected with the reaction frame, and movable ends face the confining pressure loading plate.
2. The pile driving confining pressure staged loading model test device as defined in claim 1, wherein a force transmission column is arranged between any jack and the confining pressure loading plate, the force transmission column is coaxially arranged with the jack, and the bottom of the force transmission column is fixedly connected with the confining pressure loading plate.
3. The pile driving confining pressure staged loading model test device as defined in claim 2, wherein a pressure sensor is provided between the movable end of the jack and the top of the force transfer column.
4. The pile driving confining pressure staged loading model test apparatus as defined in claim 1 wherein the center of the casing, the center of the model pile and the center of the confining pressure loading plate are collinear.
5. The pile driving confining pressure staged loading model test apparatus as defined in claim 1 wherein the diameter of said confining pressure loading plate is the same as the inner diameter of said casing.
6. The pile driving confining pressure staged loading model test device as defined in claim 5, wherein a through hole for the model pile to pass through is formed in the center of the confining pressure loading plate.
CN202320316843.7U 2023-02-24 2023-02-24 Pile driving confining pressure grading loading model test device Active CN219240651U (en)

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CN202320316843.7U CN219240651U (en) 2023-02-24 2023-02-24 Pile driving confining pressure grading loading model test device

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117627078A (en) * 2024-01-26 2024-03-01 浙江华东岩土勘察设计研究院有限公司 Test pile and simulation test system thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117627078A (en) * 2024-01-26 2024-03-01 浙江华东岩土勘察设计研究院有限公司 Test pile and simulation test system thereof
CN117627078B (en) * 2024-01-26 2024-05-03 浙江华东岩土勘察设计研究院有限公司 Test pile and simulation test system thereof

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