CN210639071U - Soft soil foundation instantaneous disturbance test system - Google Patents

Soft soil foundation instantaneous disturbance test system Download PDF

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Publication number
CN210639071U
CN210639071U CN201920858854.1U CN201920858854U CN210639071U CN 210639071 U CN210639071 U CN 210639071U CN 201920858854 U CN201920858854 U CN 201920858854U CN 210639071 U CN210639071 U CN 210639071U
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soil foundation
soft soil
micro
pressure sensor
foundation
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CN201920858854.1U
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孙淼军
单治钢
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Powerchina Huadong Engineering Corp Ltd
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Powerchina Huadong Engineering Corp Ltd
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Abstract

The utility model provides a test system of weak soil foundation instantaneous disturbance, including the mold box, in centrifuge hanging flower basket was located to the mold box, soft soil foundation was filled in the mold box, and soft soil foundation upper surface was filled and is covered dykes and dams model, covers on dykes and dams model top and the slope and arrange laser displacement sensor, lays miniature pore water pressure sensor, miniature soil pressure sensor and miniature cross plate shearing apparatus in the weak soil foundation, lays explosion source and ignition in the soft soil foundation. The utility model has the advantages that: the method can effectively evaluate the change of the physical and mechanical properties of the soft soil foundation before and after the explosion action, and evaluate the disturbance of the foundation and the influence of the explosion action on the overlying dam.

Description

Soft soil foundation instantaneous disturbance test system
Technical Field
The utility model relates to a soft basic processing technology field of geotechnical engineering, concretely relates to test system of weak soil foundation instantaneous disturbance.
Background
The breadth of our country is vast, and the geological conditions are complex and changeable. The soft soil is widely distributed in China, and particularly, lake phase or sea phase deposited soft soil exists in coastal areas of China, such as Bohai gulf, Yangtze river delta, Zhujiang delta, Zhejiang and Min coastal areas. The soft soil includes silt, silt silty soil, peat soil and the like, has the characteristics of softness, high porosity ratio, high natural water content, high compressibility, low strength, small permeability, sensitive structure and the like, has extremely poor physical and mechanical properties, and has the distribution thickness ranging from several meters to dozens of meters.
The marine reclamation project is firstly faced with the problem of soft soil foundation treatment. For the soft foundation treatment problem, an explosion method can be adopted. Compared with other soft foundation treatment technologies, the soft foundation treatment technology by the explosion method has the characteristics of simple construction process, high speed, small later settlement and the like, and especially has very important significance for promoting the development of water conservancy reclamation industry in the two aspects of reducing the using amount of closed soil and construction difficulty and easily protecting a closure. At present, although the blasting compaction soft foundation treatment technology is applied to a large number of engineering practices, the theoretical research and the engineering design of the blasting compaction soft foundation treatment technology have a plurality of immature places, the engineering application is more dependent on the engineering experience, and the theoretical research is far behind the engineering practices.
Disclosure of Invention
The utility model aims at providing a soft soil foundation transient disturbance's test system that soft soil foundation physics mechanical properties changed around can effective evaluation blast effect.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
a test system for transient disturbance of a soft soil foundation comprises a model box, wherein the model box is arranged in a centrifuge basket, the model box is filled with the soft soil foundation, an upper covering dam model is filled on the upper surface of the soft soil foundation, laser displacement sensors are arranged on the top of the upper covering dam model and a slope, a micro pore water pressure sensor, a micro soil pressure sensor and a micro cross plate shearing instrument are arranged in the soft soil foundation and are respectively used for monitoring pore water pressure, soil pressure and non-drainage strength, and acquisition signal lines of the laser displacement sensors, the micro pore water pressure sensor, the micro soil pressure sensor and the micro cross plate shearing instrument are connected to a test acquisition system;
an explosion source and an ignition device are arranged in the soft soil foundation, the ignition device comprises a current source, a relay and a controller, the current source is connected with the relay, the controller controls the on-off of the relay, and the explosion source can be detonated.
Furthermore, the micro pore water pressure sensors and the micro soil pressure sensors are arranged layer by layer in the soft soil foundation in parallel, and the micro cross plate shear apparatus is arranged layer by layer in the soft soil foundation.
Furthermore, the explosion source adopts eight-number instantaneous electric detonators, the detonators are arranged in a shallow layer of a soft soil foundation below the center line of the overlying dam model and the dike foot line, and the arrangement height of the detonators is higher than that of the micro pore water pressure sensors and the micro soil pressure sensors.
Furthermore, the model box is cuboid, the periphery and the bottom surface of the model box are welded by stainless steel plates to form a semi-closed space, and three layers of foam plates are arranged on the peripheral inner wall of the model box.
Compared with the prior art, the utility model, have following advantage:
the utility model relates to a test system of weak soil foundation instantaneous disturbance can realize the stress-strain response of weak soil foundation and upper coating dykes and dams under the explosive action, realizes the comprehensive monitoring to weak soil foundation pore water pressure, soil pressure, not drainage intensity, density, water content and dykes and dams deformation, and the physical and mechanical properties of weak soil foundation changes around can effectively evaluating the explosive action, evaluates the perturbative nature of ground to and the explosive action is to the influence of upper coating dykes and dams.
Drawings
Fig. 1 is the structural layout schematic diagram of the test system of the transient disturbance of the soft soil foundation of the utility model.
Fig. 2 is the utility model discloses a soft soil foundation instantaneous disturbance's test system's ignition schematic diagram.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in figure 1, the test system for the transient disturbance of the soft soil foundation comprises a model box 1, wherein the model box 1 is arranged in a centrifuge basket, the model box 1 is cuboid, the periphery and the bottom surface of the model box 1 are welded by stainless steel plates to form a semi-closed space, and three layers of foam plates are arranged on the peripheral inner wall of the model box 1. And filling a soft soil foundation 2 in the model box 1, wherein the soft soil foundation 2 is prepared by mixing maleic kaolin and water according to a proportion and is filled to a design height layer by layer. And an upper covering dam model 3 is filled on the upper surface of the soft soil foundation 2, and the upper covering dam model 3 is formed by filling uniform gravels with the particle size of 5-10 mm. And laser displacement sensors 4 are arranged on the top and the slope of the overlying dam model 3 to monitor the instantaneous settlement and the subsequent settlement of the dam under the action of instantaneous disturbance. A micro pore water pressure sensor 5, a micro soil pressure sensor 6 and a micro cross plate shear apparatus 7 are distributed in the soft soil foundation 2; the micro pore water pressure sensor 5 monitors the pore water pressure of the soft soil foundation 2 under the transient disturbance to obtain the growth and dissipation rules of the pore pressure, wherein the pore pressure is horizontal pressure; the micro soil pressure sensor 6 monitors the soil pressure of the soft soil foundation 2 under the transient disturbance; the micro-cross plate shearing instrument 7 monitors the non-drainage strength of the soft soil foundation 2 before and after explosion. Density and water content monitoring points 9 are also distributed in the soft soil foundation 2, and the measurement is carried out by adopting the requirement of a circular cutting method in geotechnical test regulations (SL 237-1999). The acquisition signal lines of the laser displacement sensor 4, the micro pore water pressure sensor 5, the micro soil pressure sensor 6 and the micro cross plate shear apparatus 7 are connected to a test acquisition system; the micro pore water pressure sensor 5 and the micro soil pressure sensor 6 are arranged in the soft soil foundation 2 layer by layer in parallel, and the micro cross plate shear apparatus 7 is arranged in the soft soil foundation 2 layer by layer.
An explosion source and an ignition device 8 are distributed in the soft soil foundation 2, as shown in fig. 2, the ignition device comprises a current source 81, a relay 82 and a controller 83, the current source 81 is connected with the relay 82, and the controller 83 controls the relay 82 to be switched on and off, so that the explosion source can be detonated; the explosion source adopts eight-number instantaneous electric detonators, the detonators are arranged in a shallow layer of a soft soil foundation 2 below a central line of the overlying dam model 3 and the dike foot line, and the arrangement height of the detonators is higher than that of the micro pore water pressure sensors 5 and the micro soil pressure sensors 6.
The test method of the test system based on the transient disturbance of the soft soil foundation comprises the following steps:
s1) mixing the maleic kaolin and the clear water according to the designed soil material with the water content of 40%, uniformly mixing the mixture by using a small-sized mixer, and standing the mixture for 2 hours to obtain the soil material of the soft soil foundation 2;
s2) calculating the soil material consumption according to the size (1.0m multiplied by 1.0m) of the model box 1 and the height (50cm) of the soft soil foundation 2, filling the model box 1 with the soil material, adopting the ring cutting method to measure the water content and the density of the soil material at the positions 320cm, 370cm and 420cm away from the bottom surface of the model box 1, embedding the monitoring equipment of the micro pore water pressure sensor 5 and the micro soil pressure sensor 6 in the soil material layer by layer to respectively measure the pore water pressure and the soil pressure, filling the soil material to the soil material shallow layer which is designed to cover the central line of the dam model 3 and is 80cm below the dike foot line, and embedding the explosion source and the ignition device 8, wherein the embedding height of the explosion source is higher than the design height of the monitoring equipment;
s3), after the soft soil foundation 2 is filled, drilling to positions 320cm, 370cm and 420cm away from the bottom surface of the model box 1 by using a miniature cross plate shearing instrument 7 to measure the non-drainage strength of different parts of the soft soil foundation 2, filling broken stones on the surface of the soft soil foundation 2 to simulate an overlying dam, and arranging a laser displacement sensor 4 on the top of the overlying dam model 3 and a slope;
s4) hoisting the model box 1 to a centrifuge basket, arranging a probe of a laser displacement sensor 4, and connecting the acquisition signal lines of a micro pore water pressure sensor 5 and a micro soil pressure sensor 6 to a test acquisition system;
s5) gradually increasing the acceleration step by step according to the designed acceleration, wherein the acceleration is 4 steps in total, the stable operation time of each step is 10min, and the numerical changes of the probe of the laser displacement sensor 4, the micro pore water pressure sensor 5 and the micro soil pressure sensor 6 in the corresponding acceleration process are observed;
s6), initiating an explosion source, and observing and recording data values of sensors at the moment of initiating the explosion source;
s7), maintaining the designed acceleration unchanged after detonation, stopping the machine until the deformation of the dam tends to be stable, and recording the data values of the sensors in detail after stopping the machine;
s8) the non-drainage strength of the soft soil foundation 2 after blasting is measured by the micro-cross shear 7, and the density and water content of the surface soil is measured by the ring cutter method.
After the steps are completed, time sequences of pore water pressure, soil pressure, non-drainage strength, water content and density are drawn through origin, and the influence of instant explosion on the disturbance of the soft soil foundation and the overlying dam settlement is comprehensively described through time sequence curves of all information contents.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the concept of the present invention, and these improvements and decorations should also be considered as the protection scope of the present invention.

Claims (4)

1. The utility model provides a soft soil foundation instantaneous disturbance's test system, includes the mold box, and in the centrifuge hanging flower basket was located to the mold box, its characterized in that:
soft soil foundation is filled in the model box, an upper covered dam model is filled on the upper surface of the soft soil foundation, laser displacement sensors are arranged on the top of the upper covered dam model and a slope, a micro pore water pressure sensor, a micro soil pressure sensor and a micro cross plate shearing instrument are arranged in the soft soil foundation and are respectively used for monitoring pore water pressure, soil pressure and non-drainage strength, and acquisition signal lines of the laser displacement sensors, the micro pore water pressure sensor, the micro soil pressure sensor and the micro cross plate shearing instrument are connected to a test acquisition system;
an explosion source and an ignition device are arranged in the soft soil foundation, the ignition device comprises a current source, a relay and a controller, the current source is connected with the relay, the controller controls the on-off of the relay, and the explosion source can be detonated.
2. The testing system of the transient disturbance of the soft soil foundation according to claim 1, characterized in that:
the micro pore water pressure sensor and the micro soil pressure sensor are arranged layer by layer in the soft soil foundation, and the micro cross plate shear apparatus is arranged layer by layer in the soft soil foundation.
3. A soft soil foundation transient disturbance test system as claimed in claim 1 or 2, wherein: the explosion source adopts eight-number instantaneous electric detonators, the detonators are arranged in a shallow layer of a soft soil foundation below the center line of the overlying dam model and the dike foot line, and the arrangement height of the detonators is higher than that of the micro pore water pressure sensor and the micro soil pressure sensor.
4. The testing system of the transient disturbance of the soft soil foundation according to claim 1, characterized in that: the mold box is cuboid, the periphery and the bottom surface of the mold box are welded by stainless steel plates to form a semi-closed space, and three layers of foam plates are arranged on the peripheral inner wall of the mold box.
CN201920858854.1U 2019-06-10 2019-06-10 Soft soil foundation instantaneous disturbance test system Active CN210639071U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920858854.1U CN210639071U (en) 2019-06-10 2019-06-10 Soft soil foundation instantaneous disturbance test system

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Application Number Priority Date Filing Date Title
CN201920858854.1U CN210639071U (en) 2019-06-10 2019-06-10 Soft soil foundation instantaneous disturbance test system

Publications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110374144A (en) * 2019-06-10 2019-10-25 中国电建集团华东勘测设计研究院有限公司 A kind of pilot system and its method of soft soil foundation ringing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110374144A (en) * 2019-06-10 2019-10-25 中国电建集团华东勘测设计研究院有限公司 A kind of pilot system and its method of soft soil foundation ringing

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