Three centrifuges in the central cabin are arranged in sequence to form a north-south longitudinal axis, and each experimental cabin is separated on the left and right
.
During the excavation process, the project team implements the whole process monitoring and real-time feedback
.
From the initial design to the completion of foundation pit excavation, the project team of Zhejiang University has made painstaking exploration for more than ten years
.
After completion, the underground space will be in a “Feng” shape
.
After the foundation pit excavation of the main engine room was fully completed, the project plans to complete the bidding of the remaining two centrifuge hosts and complete the pouring construction of the foundation pit bottom plate and the machine room floor of the high gravity experiment building in the second half of the year, And synchronously complete the installation of relevant embedded parts of centrifuge and temperature control subsystem.
.
23.95 meters! 38.30 meters! On the eve of July 1, good news came from the national major science and technology infrastructure project of the high gravity centrifugal simulation and experimental device under construction, and the foundation pit excavation of the main engine room was fully completed
.
It is a “national important tool” facing the world’s scientific and technological frontier and major national needs
Through the omni-directional and multi angle monitoring of the foundation pit support structure, the foundation pit state is evaluated in real time based on the monitoring data results
. 
The deep pit is divided into 8 layers and the deepest is 38.3 meters, breaking the record of “the deepest foundation pit” of public buildings in Zhejiang Province
.
CCTV evening news broadcast broke the record of “the deepest foundation pit” of public buildings in Zhejiang Province
.
After the completion of the project, it will significantly improve the ability of human beings to observe the movement of multiphase media under extreme conditions, fill the gap of China’s super large capacity hypergravity centrifuges, promote interdisciplinary integration and innovation, and provide advanced test platform and basic condition support for the development of national major scientific and technological tasks, the R & D and verification of new technologies of major projects, and the scientific development of material frontier, It has a far-reaching impact and great significance on the improvement of the original innovation ability in relevant national strategic fields, the breakthrough of scientific and technological bottlenecks, economic and social development, etc
.
The foundation pit of the main engine room is 99 meters long and 27 meters wide
.
Digging a hole is not as simple as you think
.
In order to ensure the safety and quality of foundation pit excavation, the project has established a foundation pit excavation monitoring and control group and a foundation pit excavation technical advisory group
. 
Casting the country’s heavy weapons and building the super gravity facilities of a strong country in science and technology is one of the ten priority construction projects determined in the 13th five year plan for the construction of national major science and technology infrastructure
. 
These “heavyweight” facilities and devices can build an experimental environment for the movement of multiphase media materials from transient to ten thousand year time scale, from atomic scale to kilometer scale, from normal temperature and pressure to high temperature and high pressure, and have high gravity experimental conditions such as slope and high dam, geotechnical seismic engineering, deep-sea / deep-sea engineering, geological process and material preparation, It will form the ability of a single experiment to reproduce the kilometer scale evolution and catastrophe of rock and soil mass, the perpetual migration of pollutants and the acquisition of thousands of material components
.
The foundation pit of the main engine room completed recently is one of the core projects of high gravity facilities
.
Before excavation, 17 preconditions required for foundation pit excavation are comprehensively sorted out and implemented one by one, especially for the possible foundation pit deformation, foundation pit water leakage, support damage Sort out the main risk points such as the inclination of lattice columns, formulate corresponding emergency plans, and formulate the foundation pit excavation principle of “two guarantees, two controls and one necessity”: “ensure the safety of foundation pit and the safety of surrounding environment”, “control the deformation of retaining structure and control water leakage”, “we must adhere to fast excavation and fast support”
.
The depth of the shallow pit is 23.95 meters
.
Among them, the capacity of high gravity centrifuge is the largest in the world, 6 of the 18 airborne devices are the first in the world, and the technical indexes of 12 are the leading in the world
.
National major scientific and technological infrastructure refers to the national public facilities that provide long-term services for high-level research and have great international influence in order to improve the ability to explore the unknown world, discover natural laws and realize scientific and technological change
.
In particular, the excavation depth of the foundation pit of the high-speed machine equipment foundation is nearly 40m, and the support replacement technology is complex
.
It is very difficult to control the temperature crack and waterproof the underground structure during the construction period
.
Zhejiang University is responsible for the construction of this country’s important instrument, which has once again boarded CCTV
.
In 2011, the team of academician Chen Yunmin from the school of architectural engineering of Zhejiang University put forward the idea of building the world’s largest “super gravity” device; In 2013, the project was listed in the medium and long term plan for the construction of national major scientific and technological infrastructure; In 2016, it was listed in the ten priority projects of the 13th five year plan for the construction of national major scientific and technological infrastructure; At the end of 2018, the national development and Reform Commission approved the project feasibility study report; The project will be officially launched in 2019; In 2020, the single source procurement of model preparation machine and the construction of all engineering piles will be completed; In the first half of 2021, the engineering design of the model preparation machine passed the review, and the foundation pit excavation of the main engine room was fully completed..
.
It mainly uses the centrifugal force generated by the centrifuge to simulate high gravity, and uses the airborne experimental device on the centrifuge to realize the material movement test under high gravity
.
The national major science and technology infrastructure of high gravity centrifugal simulation and experimental device (hereinafter referred to as “high gravity infrastructure”) was established by the Ministry of education and the people’s Government of Zhejiang Province as the competent department As the legal entity of the project, Zhejiang University is responsible for the construction of the first major national science and technology infrastructure in Zhejiang Province
.
If the warning value is exceeded, the excavation monitoring and control group shall conduct data analysis together with the excavation technical advisory group, and take relevant emergency measures according to the analysis results
.
The super gravity large facility project is located in Hangzhou future science and Technology City, Zhejiang Province, covering an area of 89 mu, with a construction area of 34560 square meters
.
Deeper, deeper..
.
During the 6-month excavation process, 15 expert analysis meetings were held to summarize the foundation pit construction
. 
Overview of foundation pit of main engine room shallow pit of foundation pit of main engine room deep pit of foundation pit of main engine room interior view of super gravity centrifuge has the largest capacity in the world, 6 of the 18 airborne devices are internationally pioneered, and 12 are internationally leading in technical indicators..
.
Due to the world leading technical indicators of high gravity facilities, there is no precedent for most engineering construction contents, and the requirements for vibration resistance and waterproof of equipment foundation are high, The equipment foundation is composed of 3.5m thick high-strength mass concrete
.
It is expected to be completed and put into operation in 2024
.
The project was excavated on January 1, 2021, and the excavation of shallow pit and deep pit were completed on May 8 and June 30, respectively
.
The construction period is 5 years
.
The final deformation of the foundation pit is small, and the cumulative maximum horizontal displacement of the deep layer of the diaphragm wall shall not exceed 28mm
. 
The super gravity facilities mainly include 3 sets of heavy-duty super gravity centrifuges, high-speed super gravity centrifuges and model preparation machines with controllable centrifugal acceleration and load, 6 super gravity experimental chambers such as slope and high dam, geotechnical seismic engineering, deep-sea engineering, deep-earth engineering and environment, geological process and material preparation, extreme climate and environment simulation devices, high-speed railway subgrade dynamic loading devices 18 airborne devices such as high gravity unidirectional shaking table, deep-sea high-pressure temperature control experimental device, deep earth space surrounding rock disaster experimental device, high-pressure and high-temperature experimental device, high-throughput preparation melting and casting furnace, etc
.
