CN-116519585-B - Granite weathered soil atmospheric disintegration experimental system and experimental method

CN116519585BCN 116519585 BCN116519585 BCN 116519585BCN-116519585-B

Abstract

The invention relates to the technical field of geotechnical engineering analysis and test and discloses a granite weathered soil atmospheric disintegration experiment system and an experiment method, wherein the experiment system comprises an experiment box, a soil sample support is arranged in the experiment box, and an open container is arranged below the soil sample support; the device comprises a soil sample support, a humidifying device, a drying device, a pressure detector and a data acquisition device, wherein the humidifying device is arranged above the soil sample support and is provided with a spray head for spraying water to a soil sample to be tested, the drying device is arranged on the side wall of an experiment box and is used for drying the soil sample to be tested, the pressure detector is arranged on the lower side of the open container, and the data acquisition device is connected with the pressure detector and is used for acquiring pressure data detected by the pressure detector. The experimental system can realize the simulation of the soil sample disintegration process under various scenes, and is more in line with the actual and changeable climatic conditions, so that the simulation scene is in line with the actual situation, the disturbance of the experiment on the soil sample is effectively reduced, the measurement precision of the disintegration experiment is improved, and the experimental error is reduced.

Inventors

XU HANSHENG
LIU ZHIFANG
LIANG ZHU
WU YUEQIN
Lin Lujie
Liao Sihang

Assignees

广州市城市规划勘测设计研究院

Dates

Publication Date: 20260512
Application Date: 20230530

Claims (7)

1. The experimental method of the granite weathered soil atmospheric disintegration experimental system is characterized by comprising the following steps of: step S1, placing a soil sample to be detected on a soil sample bracket; s2, calculating corresponding water spraying flow according to the set rainfall intensity, and humidifying the soil sample to be tested through the spray head; Step S3, after the humidification process reaches a first set time, the spray head is closed, and pressure data detected by the pressure detector are recorded through the data acquisition device; s4, drying the soil sample to be detected for a second set time through a drying device, and recording pressure data detected by a pressure detector through a data acquisition device; s5, taking out and cleaning the open container, and placing the open container into the experimental box; Step S6, the step S2 to the step S5 are circulated until the circulation times reach the set times; S7, processing recorded data of the data acquisition device in the circulation process to obtain the real-time disintegration rate and the disintegration rate of the soil sample in the experimental process; in the step S7, the real-time disintegration rate of the soil sample to be measured in the nth cycle is calculated by the following formula: wherein A nt is the real-time disintegration rate of the soil sample to be detected in the nth cycle, M is the real-time reading of the pressure detector, M b is the total mass of the open container and the water-proof baffle, M w is the total mass of water in the open container, and M 0 is the initial dry mass of the soil sample to be detected; in the step S7, the disintegration rate of the soil sample to be measured in the nth cycle is calculated by the following formula: Wherein V 5 represents a soil sample disintegration rate at which the soil sample disintegration rate reaches 5% in the nth cycle, V 10 represents a soil sample disintegration rate at which the soil sample disintegration rate reaches 10% in the nth cycle, V 15 represents a soil sample disintegration rate at which the soil sample disintegration rate reaches 15% in the nth cycle, A 5 represents a soil sample disintegration rate of 5% in the nth cycle, A 10 represents a soil sample disintegration rate of 10% in the nth cycle, A 15 represents a soil sample disintegration rate of 15% in the nth cycle, t 5 represents a duration of a moisturizing process at which the soil sample disintegration rate reaches 5% in the nth cycle, t 10 represents a duration of a moisturizing process at which the soil sample disintegration rate reaches 10% in the nth cycle, and t 15 represents a duration of a moisturizing process at which the soil sample disintegration rate reaches 15% in the nth cycle; granite weathered soil atmospheric disintegration experiment system includes: The device comprises an experiment box, wherein a soil sample support for placing a soil sample to be tested is arranged in the experiment box, and an open container with an upward opening is arranged below the soil sample support; the humidifying device is arranged above the soil sample support and is provided with a spray head for spraying water to the soil sample to be tested; The drying device is arranged on the side wall of the experimental box and is used for drying the soil sample to be detected; A pressure detector disposed at a lower side of the open container; the data acquisition device is connected with the pressure detector and is used for acquiring pressure data detected by the pressure detector.
2. The experimental method of the granite weathered soil atmospheric disintegration experimental system according to claim 1, In the step S7, the total disintegration rate of the soil sample to be measured after n cycles is calculated by the following formula: Wherein M i represents the reading of the pressure detector at the end of the ith cycle moisturizing process, M b represents the total mass of the open container and the water-proof baffle, M w represents the total mass of water in the open container, A n represents the total disintegration rate of the soil sample to be tested after n cycles, and M 0 is the initial dry mass of the soil sample to be tested.
3. The experimental method of the granite weathered soil atmospheric disintegration experimental system according to claim 1, wherein a water blocking plate is provided at a lower side of the open container, and the pressure detector is provided at a lower side of the water blocking plate.
4. The experimental method of the granite weathered soil atmospheric disintegration experimental system according to claim 1, wherein a movable baffle is slidably provided on a side wall of the experimental box, and the experimental box is opened or closed by sliding the movable baffle.
5. The method according to claim 1, wherein the drying device comprises a heating lamp and a ventilation fan, the heating lamp is installed above a side wall of the experiment box, and the ventilation fan is installed at the side wall of the experiment box.
6. The experimental method of granite weathered soil atmospheric disintegration experimental system according to claim 1, wherein the humidifying device comprises: The water storage tank is arranged outside the experiment box; The water suction pump is arranged in the water storage tank; one end of the water pipe is connected with the water suction pump, and the other end of the water pipe is connected with the spray head; A flowmeter mounted on the water pipe; and the control valve is arranged on the water pipe.
7. The experimental method of the granite weathered soil atmospheric disintegration experimental system according to claim 1, wherein a box cover is arranged at the top of the experimental box, water injection holes are arranged on the box cover, the water injection holes are positioned above the soil sample support, and the spray head enters the inside of the experimental box through the water injection holes.

Description

Granite weathered soil atmospheric disintegration experimental system and experimental method Technical Field The invention relates to the technical field of geotechnical engineering analysis and test, in particular to a granite weathered soil atmospheric disintegration experimental system and an experimental method. Background Along with the acceleration of the urban process, engineering construction tasks are aggravated, and artificial disturbance is aggravated when granite weathered soil is used as a common geotechnical engineering carrier. The granite weathered soil in the south China of China is widely distributed, and rainfall is frequent, so that geological disasters such as ground subsidence, post collapse and the like are easily induced, serious engineering accidents are caused, and engineering construction is seriously influenced, and life and property safety of people is threatened. All the above-mentioned properties are closely related to the disintegration property of granite weathered soil, so that the research on the disintegration property of granite weathered soil has important theoretical and practical significance for engineering construction. The disintegration of granite weathered soil means that after the granite weathered soil contacts with external water, the phenomenon of disintegration and disintegration occurs. Stress concentration and structural strength loss generated in the soil body in the water absorption process are important reasons for disintegration. In fact, due to the influence of regional and changeable climate, granite weathered soil is influenced by repeated humidifying and drying effects for a long time, and the mechanical properties of the granite weathered soil are continuously deteriorated due to the damage of an internal microstructure, so that the granite weathered soil finally disintegrates. Therefore, the complex wetting and drying environment caused by changeable climates is an important factor influencing the disintegration of granite weathered soil. At present, the existing granite weathered soil disintegration experimental device and method have certain limitations, in the prior art, the disintegration experiment of the granite weathered soil is mostly concentrated in the process of rapidly saturating and disintegrating the soil body of the sudden drop and storm by immersing the soil sample, but in most immersing and disintegrating experiments, the hydrostatic pressure can generate additional stress in the soil sample to cause the soil sample to disintegrate characteristics different from actual conditions, in addition, the existing experimental study about the influence of the climate environment change on the granite weathered soil disintegration characteristics is mostly limited in setting a simple periodic dry-wet alternation process, the experimental device can not simulate the dry environment of the scenes such as natural air drying, high Wen Rizhao and the like, the humidity increasing environment with different rainfall intensities can not be reflected, and the experimental study is inconsistent with the actual changeable climate conditions, so that the existing granite weathered soil disintegration experiment has lower measurement precision and larger experimental error. Disclosure of Invention In view of the above problems, the invention aims to provide an atmospheric disintegration experiment system and an experiment method for granite weathered soil, which are used for solving the problems that in the prior art, soil sample disintegration properties simulated by a soaking disintegration experiment device are different from actual conditions, and the actual and changeable climatic environment conditions cannot be simulated, so that the experiment measurement precision is low and the experiment error is large. In order to achieve the above purpose, the present invention adopts the following technical scheme: one aspect of the present invention provides a granite weathered soil atmospheric disintegration test system, comprising: The device comprises an experiment box, wherein a soil sample support for placing a soil sample to be tested is arranged in the experiment box, and an open container with an upward opening is arranged below the soil sample support; the humidifying device is arranged above the soil sample support and is provided with a spray head for spraying water to the soil sample to be tested; The drying device is arranged on the side wall of the experimental box and is used for drying the soil sample to be detected; A pressure detector disposed at a lower side of the open container; the data acquisition device is connected with the pressure detector and is used for acquiring pressure data detected by the pressure detector. Preferably, a water blocking plate is arranged on the lower side of the open container, and the pressure detector is arranged on the lower side of the water blocking plate. Preferably, a movable baffle is slidably a