184 days in advance, the first long-distance tunnel over 10 kilometers in Yunnan Dianzhong Water Diversion Project will be connected to the tunnel | Project | Water Diversion

Release time:Apr 14, 2024 16:30 PM

On August 9th, after 1350 days of intense construction, the 11.2 kilometer long Longqing Tunnel of Yunnan Dianzhong Water Diversion Project was completed 184 days ahead of the planned schedule. This is the first extra long tunnel with a length of more than 10 kilometers that has been fully connected along the entire line. Its construction unit, China Railway First Bureau, has also become the first unit in the 40 main sections of the Dianzhong Water Diversion Phase I project to fully connect the tunnel construction.

The Dianzhong Water Diversion Project faces "six world-class challenges" in the construction process and needs to overcome "ten world-class technical difficulties". It is a truly "living" geological museum.


184 days in advance, the first long-distance tunnel over 10 kilometers in Yunnan Dianzhong Water Diversion Project will be connected to the tunnel | Project | Water Diversion

Project leader Duan Liangjun introduced: "The Longqing Tunnel is a microcosm of this' Geological Museum '. During the construction process, 8 large karst caves and more than 200 small karst caves were excavated and exposed, as well as 12 collapses and sudden mud and water surges. Among them, the daily average seepage volume of the upstream and downstream main tunnels of the Longqing Tunnel No. 1 branch is as high as 20000 cubic meters, and the daily sudden mud and water surges at the intersection of the Longqing Tunnel No. 2 branch reach 12000 cubic meters. The total length of the tunnel's soft rock deformation section is 830 meters. Among them, the maximum deformation of the first level fault in Xijian Village downstream of the Longqing Tunnel No. 1 branch is 60 centimeters. We have taken targeted construction measures according to different geological conditions, following the principle of' exploration before excavation '." The construction will be carried out in accordance with the principles of strengthening water blocking, combining water blocking and drainage, limited discharge, graded treatment, and highlighting key points. The completion of the Longqing Tunnel is also the first tunnel in Yunnan Province's Yunnan Central Water Diversion Phase I Project, with a total length of 664 kilometers and more than 40 sections, to achieve comprehensive completion. "

In addition, "soft rock deformation" is also a major "pain point" faced by the construction of the Longqing Tunnel. The common saying in underground tunnel excavation is' bully the hard and fear the soft '. Once encountering soft rock deformation, it is like dancing on tofu blocks. When encountering groundwater again, the muddy sandstone shale is like a' swamp '. We usually have a' water curtain hole 'on our head and a' swamp 'on our feet. To solve the problem of soft rock deformation, we first reserve the deformation amount based on previous construction experience, and each time consider the number of steel support processing according to the length of 5 to 10 meters, to prevent frequent changes in soft rock. The reserved deformation amount of steel support is too large or too small to cause cost waste. Then, we ensure timely' sealing into a loop ', and make predictions based on geological forecasts, advanced horizontal exploration holes, and actual conditions of the surrounding rock, so as to make judgments first and then determine the plan. The most crucial thing is that we make decisions based on "The soft rock tunnel section adopts an excavation method mainly consisting of three steps and four steps, and the support adopts a combination of advanced large pipe shed, steel support, self-propelled locking foot pipe shed, anchor spraying, horizontal transverse support, and radial consolidation grouting. In the end, this problem is well overcome," said technical leader Dou Ziqi in detail.


184 days in advance, the first long-distance tunnel over 10 kilometers in Yunnan Dianzhong Water Diversion Project will be connected to the tunnel | Project | Water Diversion

The Dianzhong Water Diversion Project is a landmark project among the 172 major water conservancy projects for water-saving and water supply determined by the State Council. It is also the largest and most invested water resource allocation project in Southwest China. The engineering design takes water from the Jinsha River, about 1.5 kilometers upstream of Shigu Town in Lijiang City, and the pump station lifts the water to the main canal. Then, the water transmission project starts from Shigu Town for self flow water transmission, passing through Lijiang City, Dali Prefecture, Chuxiong Prefecture, Kunming City, Yuxi City, and ending at Honghe Prefecture. The total length of the water transmission line is about 664 kilometers. After completion, 3.4 billion cubic meters of high-quality water can be diverted annually to the central region of Yunnan, alleviating the contradiction of urban production and domestic water use, improving the ecological and water environment of rivers and lakes in the region, and benefiting a land area of 37000 square kilometers and more than 11 million people.

Two women were stabbed to death and reported to have committed a crime 4 days before the follow-up visit for schizophrenia. Suspect of a bloody murder case in a Hong Kong shopping mall appeared in court today. Male | Last Friday | Murder case
Two women were stabbed to death and reported to have committed a crime 4 days before the follow-up visit for schizophrenia. Suspect of a bloody murder case in a Hong Kong shopping mall appeared in court today. Male | Last Friday | Murder case

According to Hong Kong's Wen Wei Po, a bloody knife stabbing case occurred at Hollywood Square in Diamond Hill last Friday. The police arrested a 39 year old man on suspicion of stabbing two young women, one of whom was stabbed over 30 times. The suspect appeared in the Kwun Tong Magistrates Court this morning. The police at the Kwun Tong Magistrate's Court temporarily charged the suspect with two counts of murder last Sunday. The suspect appeared in court this morning at the Kwun Tong Magistrate's Court. Acting Chief Magistrate Zheng Jihang, after listening to the opinions of both the prosecution and defense, decided to postpone the hearing for two weeks until 9:30 am on June 19th, waiting for two psychiatric expert reports to be obtained. The defense did not object. Zheng Jihang approved the application, and the defendant needs to be temporarily detained at Xiaolan Mental Hospital. When the suspect appeared in court, he wore black framed glasses, a light gray shirt, and camouflage green shorts, and was able to answer the judge's questions normally. accordingly

Secretary of the Provincial Party Committee: The focus of Henan's "summer harvest" has shifted to agricultural machinery in the northern region of Henan Province. | Support | Science | Organization | Province | Northern Henan | Summer Harvest | Rush Harvest
Secretary of the Provincial Party Committee: The focus of Henan's "summer harvest" has shifted to agricultural machinery in the northern region of Henan Province. | Support | Science | Organization | Province | Northern Henan | Summer Harvest | Rush Harvest

Currently, the highly anticipated summer harvest work in Henan has shifted its focus to the northern region of Henan. According to the Henan Daily client, on June 4th, Lou Yangsheng, Secretary of the Henan Provincial Party Committee, presided over a special video scheduling meeting on the "Three Summers" work in the province, listened to the situation report, analyzed and judged the situation, and arranged and deployed the next steps of work. Governor Wang Kai made specific arrangements. On the evening of May 31, 2023, in Xiafutou Village, Xuliang Town, Boai County, Jiaozuo, Henan Province, villagers braved light rain in the wheat fields to harvest wheat. Visual China Map Lou Yangsheng pointed out that the current summer harvest battle in the province has entered the decisive stage. Doing a good job in summer harvest in northern Henan Province is related to the summer grain yield and seed safety. We should focus on seizing opportunities and make every effort to organize the wheat harvesting work in the northern Henan region, minimize losses, and protect the interests of farmers to the greatest extent possible. Accurate forecasting is essential

Xinhua All Media+| Welcome home! What innovative technologies are protecting the return journey of Shenzhou 15? Spaceship | Shenzhou | Technology
Xinhua All Media+| Welcome home! What innovative technologies are protecting the return journey of Shenzhou 15? Spaceship | Shenzhou | Technology

On June 4th, the return capsule of the Shenzhou-15 manned spacecraft successfully landed at the Dongfeng landing site. Astronauts Fei Junlong, Deng Qingming, and Zhang Lu all safely and smoothly exited the spacecraft, and the Shenzhou-15 manned flight mission was a complete success. What innovative technologies are there to safeguard the return journey of Shenzhou 15 in this mission? On June 4th, the return capsule of the Shenzhou-15 manned spacecraft successfully landed at the Dongfeng landing site. Xinhua News Agency reporter Lian Zhen photographed that "the sky and the ground" ensure the high-precision return of spacecraft. For the Shenzhou series spacecraft, the return and re-entry GNC technology is directly related to the life safety of astronauts. Taking the success of this return mission as a symbol, China has comprehensively upgraded its GNC system since the Shenzhou-12 manned spacecraft, which features autonomous rapid rendezvous and docking, autonomous adaptive prediction and re-entry return guidance, and has completed a comprehensive update and replacement

The Chinese naval fleet has arrived! Assembly | Navy | Chinese Fleet
The Chinese naval fleet has arrived! Assembly | Navy | Chinese Fleet

At noon today, a Chinese naval fleet consisting of Zhanjiang and Xuchang ships arrived at the assembly area of the "Comodo-2023" multinational maritime joint exercise. It is understood that the assembly anchorage for this exercise is 3 nautical miles long and 1.5 nautical miles wide, capable of anchoring up to 50 ships. Naval vessels from various countries participating in the exercise will also arrive at the anchorage today to complete the assembly of the "Komodo 2023" multinational maritime joint exercise, which is held every two years by the Indonesian Navy. This year is already the fourth edition of the exercise. The exercise will be held from June 5th to 8th in the city of Jakarta, South Sulawesi Province, Indonesia, including the port and sea phases. In the coming days, participating navies from various countries will participate in ship reading style search and rescue exercises, maritime interception and damage management exercises, aerial exercises, and other course objectives exercises

New comment: Donkey like "morale" limit pulls US debt "bomb" fuse hard to dismantle US | debt | morale
New comment: Donkey like "morale" limit pulls US debt "bomb" fuse hard to dismantle US | debt | morale

On the evening of June 1st, the US Senate passed a bill on the federal government's debt ceiling and budget, and the flame of the US debt bomb was temporarily extinguished at the last moment. The two parties in the United States have staged an extreme tug of war over the US debt bomb. Some experts believe that the US debt crisis is the result of the reckless politics promoted by the US dollar hegemony, and the underlying cause of this crisis is the highly polarized political system of the US. Since the end of World War II, the US Congress has adjusted the debt ceiling more than a hundred times. The recurring debt crisis will not only have a catastrophic impact on the US economy and people's livelihoods, but also continuously erode the value of US dollar assets such as government credit and US bonds, bringing significant and far-reaching impacts to the global economic landscape. 【