I support cooperation between the Bill & Melinda Gates Foundation and relevant Chinese institutions. The Bill & Melinda Gates Foundation was quick to join the global response to the COVID-19 outbreak and has played an active role. To overcome an epidemic affecting the safety of people of all countries, unity and cooperation are our most potent weapon. I have been saying that humanity is a community with a shared future. Only by cooperating and responding together can the international community overcome this pandemic. Humanity is a community with a shared future. Viruses do not respect borders, nor do epidemics discriminate between races. President Xi Jinping attended the Extraordinary G20 Virtual Leaders’ Summit and gave a speech titled “ Working Together to Defeat the COVID-19 Outbreak.” One of the DTSES TBMs launched on April 28 Unity and Cooperation Are the International Community’s Most Potent Weapon to Overcome the Pandemic They have beendesigned to be used in open-type work mode (TSA mode) underfavorable rock conditions, extruded-concrete-lining support (TE mode)modein fracture zone, soft rock and rock-burst ground,and single-shield steel-segment supportmode (TS mode) inextreme fracture zone, area with large deformation of soft rock,and intense rock burst stratum section. These two φ8.43m TBMs are 282m long and weigh 2,000 tonnes. These two novel-type TBMs feature a high degree of automation, strong geological adaptability and fast construction speed and can help ensure a good working environment on site and low labor intensity of workers. Thus, safe, green, rapid and efficient excavation through complex geological conditions (great deformation, intense rock burst and multiple fault zones) can be ensured. The DTSES TBM with two excavation modes and three support modes has been developed to cope with the complex geological conditions, and overcome some common problems for open-type TBMs like failure to propel due to the gripper’s slip, excess work for support and inability to clearing muck. In view of many problems that are likelyto be encountered during the construction, CCCCTH became the first to propose the concept of DTSES, and has already put it into practice in a creative manner. The earthquake intensity at the tunnel site is VIII degree, while the maximum water inflow at the site is about 29,000 m 3/day,and the high-pressure water inflow pressure can reach 4 MPa (equivalent to water pressure produced by 400 meters of water). Given such extreme conditions, the TBMs are bound to meet many universal problems like excavation through large faults, fracture zones, and large deformation of soft rock, rock burst, slurry and water gush and high ground stress.
It is located in a place characterized by high ground stress, coldness, high earthquake intensity, high altitude, and multiple fault zones.
TianshanShengli Tunnel is a key project for Wuyu Expressway.With an overall length of 22.69km,the tunnel is by far the world’s longest expressway tunnel. With all-out efforts to resumework and production for key projects in an orderly manner and continuous adjustmentfor and optimization ofthe production plan to ensure progress, the company has finally managed to producethe two TBMs as scheduled. Faced with the impact of the novel coronavirus pneumonia epidemic, CCCCTH has taken strict epidemic prevention and control measures and at the same time promoted resumption of work and production. The two TBMs willthen undertake the task of opening up a transportation route between the north and south of TianshanMountainand promoting the rapid development of the BRI. On April 28, CCCCTH launched two DTSES TBMs,which were named “Xueshan” and “Xuelian” respectively, atChangshu Base of CCCCTH.The two DTSES TBMs represent first of their kind in the world and are going to serve the construction of TianshanShengli Tunnel of Wuyu Expressway in Xinjiang Uygur Autonomous Region, the world’s longest expressway tunnel and also an important project under the framework of the Belt and RoadInitiative(BRI).
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