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Tsinghua University Prof. Jianmin Li

中国锦屏地下实验室二期 建设进展汇报. Tsinghua University Prof. Jianmin Li. CJPL Site and Jinping-II Hydropower Station. Intake. Traffic tunnel x 2. Drainage tunnel. CJPL-II. Diversion tunnel x 4. CJPL-I. 17.5km. Hydropower station.

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Tsinghua University Prof. Jianmin Li

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  1. 中国锦屏地下实验室二期 建设进展汇报 Tsinghua University Prof. Jianmin Li

  2. CJPL Site and Jinping-II Hydropower Station Intake Traffic tunnel x 2 Drainage tunnel CJPL-II Diversion tunnel x 4 CJPL-I 17.5km Hydropower station • Seven high pressure tunnels: two auxiliary tunnels, one water drainage tunnel and four headrace tunnels • Background radiation of marble is less than 1/100 of nature radiation • Maximum overburden of 2525 m and principal stress of 70MPa by back analysis • Average length of 17.7km with two curves in the end, good for comic radiation shielding.

  3. Preliminary Design of CJPL-II Link Tunnel Connecting Tunnel Emergency tunnel 4x Lab Halls （130 x 12 x 12 m3）

  4. Preliminary Design of CJPL-II • Structure design requirements： • Add a Link Tunnel at a place which is same height between 1# & 2# tunnels, inner size is 7m×7m after concreting, slope of 1% • Build 4 Connecting tunnels to link 1# tunnel to 1-4# lab halls separately, inner size after concreting is 8.2m×8.2m. The lab halls use the stagger formation, all lab halls’ axial parallel 1# tunnel. Slope of 1# and 2# Connecting tunnels is 1%, and Slope of 2# and 4# Connecting tunnel is 4.5% . • The length of each lab hall is 130, inner size after concreting is 14m×14m, slope is about 0.3%. Steel structures will support the lab hall with the decorating plates required by experimental required. Headroom of the lab hall is 13.2m×13.2m There is a 5t bridge carne with 11.5m span in each Lab hall. • For emergency exit，there are 1# emergency tunnel between 1# lab and 2# lab ，and 2# emergency tunnel between 3#lab and 4#lab. The inner size after concreting is 5m×5m. • There are 2×2 automatic sealed doors in the entry of 1# tunnel, 2# tunnel from traffic tunnel A. there are 2 automatic sealed doors between 1# tunnel and water drainage tunnel. There are 2 fire doors between Link tunnel and 1#, 2# tunnels. There are 4 fire doors between lab halls and emergency tunnels. And there are 4 automatic sealed doors between connect tunnels and lab halls.

  5. Preliminary Design of CJPL-II • Requirement of lab hall： • The length of each lab hall is 130, the inner size after rock bolting is 14m×14m, slope is less than 0.3%. Drainage ditches are on the both side. • There are waterproof plate between steel support structure and roof/walls. Wall and roof adapt removable decorating steel plates. Floor adapts Silicon carbide for wear proof. • Transport tunnels adapt the same floor and use Cement-based infiltration waterproof coating and Modified waterproof mortar for roof and walls . • There is a 5t bridge carne inside the lab hall. • Lab halls adapt independent steel structure for supporting pipes and cables. • There are sealed doors between lab halls and connecting tunnels based on the requirement. There are fire doors between lab halls and emergency tunnels. • Each tunnels has an equipment room in the connecting tunnel, which has 240 brick wall, floor height 3.6m. All lab halls will adapt environmental protection toilets

  6. Render Picture of Lab Hall

  7. Preliminary Design of CJPL-II • Requirements of Ventilation system ： • Normal capacity of fresh air supply is 30,000 m3/h，and the peak is 50,000 m³/h. • Main ventilation room is in the west of water drainage tunnel, with 4 high pressure blower units, which will get the fresh air from outside water drainage tunnel by Φ 800m x 4 PE pipes to a constant pressure air tank. • After cleaned, the fresh air will be pressured to another constant pressure air tank in the 1# tunnel through the 4x11km PE pipes(Φ800mm). For these two long distance pipes, there are valves per 1km, 300mm bellows per 100m. • Inside the 1# tunnel, the fresh air from the constant pressure air tank are cleaned again and distributed to the lab halls and tunnels of CJPL-II by 5 PVC pipes (Φ500mm). 4 PVC pipes are connected to 4 lab halls separately. And the fifth pipe will supply fresh air for 1# & 2# tunnels. • There is no air exhausting pipe in lab halls, the pressure valves on the sealed doors will be used to keep positive pressure of fresh air. An exhausting fan is used to exhaust air of 1# tunnel. • Sets of gas exhausting system are mounted for exhausting waste gas, which include the dedicated PVC pipe in each lab hall. • Sets of water cooling system will supply cooling water for each lab hall.

  8. Render Picture of Tunnel

  9. Preliminary Design of CJPL-II • Water supply and drainage system design requirements: • Local water supply and drainage system: Local water (8m3/h with 0.4MPa), getting from nearby spring inside rook of the end of 2# tunnel, are used for sanitary ware and water purification equipment (1.5m3/h). • All waste water of the lab halls and tunnels will be innocent treated and drained to the drainage tunnel by the ditch beside the lab halls and tunnels. • Fire hydrant water supply system: There are fire hydrants in 1# tunnel, 2#tunnel, connecting tunnel and emergency tunnel. Fire hydrant water supply is 15L/s, min flow for each pipe is 10L/s. Fire hydrant water is supplied by fire hydrant pump in 2# tunnel, water pressure is 0.4MPa. There is a fire hydrant every 200m in 1# tunnel and 2#tunnel, and every 30m in the connect tunnel and the lab halls. It can make sure there will be 2 hydrants to reach any position in tunnels and lab halls. • There are automatic spraying water systems in 1#, 2# tunnels and connecting tunnels with 0.5MPa supply pressure • In the lab halls, there no automatic spraying water system.

  10. Preliminary Design of CJPL-II • Electrical design requirements： • 10kV high-voltage electric bus, using two cables (2x10MVA) connected to two power stations outside of the traffic tunnels, is the basic power supply system of CJPL-II. Each electric cable is the spare to other with bus coupler switches. • From the bus coupler switches, five 10kV electric cable are connect to five 10/0.4 kV three-phase transformers, step-down to 380/220 VAC. Four units of them are mounted in four connecting tunnels of the lab halls, which capacity are 1MVA are used for power supply of the lab halls. And one of them are mounted in 1# tunnel, which capacity is 250kVA, are used for the facilities of CJPL-II. • The low voltage side of the above transformers will set the automatic adjustment of power factor compensation capacitors, to ensure the power factor above 0.9. TN-S system are adopted for low voltage power distribution system. • According IEC requirement, lighting system using regional comprehensive automatically control switch. All lighting will use LED energy-saving light source to save the electric power, some emergency lighting will use the built-in battery lighting. • The overall earth connection resistance of TN-S grounding system will be not more than 1 ohm, and is separated from earthing system of the Lab halls.

  11. Preliminary Design of CJPL-II • Control and communication requirements ： • Automatic fire alarm and linkage system: adopting bus alarm, bus control mode. Alarm and control share bus to branch type connection. Each area alarm signal transmit fiber to the control room outside of the tunnel with optical fiber. • CCTV: Many POE and IP cameras are set in main entrance other place of the tunnel and connected to the field bus system of control. The optical transceiver will be set in the proper place. video and control signal will be transmit through the optical transceiver to control room outside of tunnel. • Voice communication system: there is no mobile phone signal in the tunnel. Telephone, broadcasting system and intercom system will be adopted. • Data network system: setting fiber optic cables to make sure 2x dual-channel network in lab halls. There is no WIFI in lab halls, the optical terminals will be set in all of the lab halls. And all of optical terminals are connected to the control room outside of tunnels with optical fiber.

  12. CJPL-IIConstruction Process • 2012. 12 CJPL-II decided by committee • 2013.3Space requirement confirmed • 2013.9 Relevant engineering research of CJPL-II • 2014.4 Reported estimate cost and approved in 2014.6 • 2014.8 THU Signed contract with Yalong river company • 2014.6.16 Yalong river company started tender process： • End of September: release the tender • End of October: confirm the construction company • December: Sign the contract, confirm payment, construction preparation • 2015.2: Start construction • 2015.8: Finish the civil work • 2015.12: Delivery to Scientist

  13. CJPL-II Construction site，Dec 2014

  14. CJPL-II Construction Complete Schedule 1st constructionadit supporting construction completed! 1# Connecting tunnel completed! 2# Connecting tunnel completed! 3# Connecting tunnel completed! 4# Connecting tunnel completed! 1#Lab Hall ~60% 1st stage digging planning 3#Lab Hall 100% 1st stage digging planning 4#Lab Hall ~25% 1st stage digging planning 2#Lab Hall 10% 1st stage digging planning Upon to the end of April 2015

  15. Rock burst and collapse during Construction rock burst after digging in Hall 4# Dealing with the collapse

  16. Different hazard at different chamber under the same overburden and excavation method Rock bolt Joints (1) Large scale collapse at roof in 3# chamber, 13 April, 2015,volume: 1000m3 Recollapsed on 09 May,2015 after support

  17. 最近完成情况（5月11日至5月19日）

  18. CJPL-II Radioactivity Background Control some coal ash from electric power plant and some nano-additive were as concrete building material during the tunnel construction. Comparison of radionuclides concentration(Bq/kg) Need to control the raw material of concrete!

  19. CJPL-II Radioactivity Background Control The components of concrete: water, cement and aggregate. The mass ratio in 1 m3 concrete would be 1:2:12( at this moment). rock/concrete thickness: 20cm Blue: 20cm rock. Red/Green: concrete 20cm simulation model when the concentration of 238U in the cement less than 3.0 times than that in the rock, the gamma background would be increase less than 50%. gamma spectrum of simulation results

  20. CJPL-II Radioactivity Background Control silica limestone titanium gypsum iron ore stone iron ash Gamma spectrum of raw material by GeTHU CaSO4·2H2O raw coal from Xinjiang

  21. CJPL-II Radioactivity Background Control gamma spectrum of different cement by GeTHU --green： ordinary cement (20150210)(~4 times) --blue： moderate heat cement(<1.5times) --red：rock sample(base line)； --purple: ordinary cement (20150208)(3-4time) customized Moderate heat cement

  22. CJPL-II Radioactivity Background Control nano-addative material sampling and gamma spectrum by GeTHU. The upper is 10 times to rock sample and can’t used in CJPL-II construction nano-addative material sampling and gamma spectrum by GeTHU(red: rock sample baseline; green: nano-addative)

  23. IV. Summary • CJPL will be first-class underground laboratory in the world. • CDEX and PANDAx experiments has been running in CJPL-I and the preliminary experiment results inspiring; • CJPL-II are constructing currently, and would be finished in 2016. Some experiments have been proposed in CJPL-II.

  24. Thank !Welcome to CJPL Prof. Jianmin Li Email: leejm@tsinghua.edu.cn Cell phone: +86-13911239065 Dept. of Engineering Physics Tsinghua University

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