China Railway Eighth Engineering Group Co., Ltd
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To overcome difficulties, it crosses 7 large adverse geological zones
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On the one hand, in the preparation of the treatment scheme, the method of water discharge from the initial support opening behind the tunnel face is proposed, and the water gushing from the tunnel face is successfully led out from the rear water discharge hole; On the one hand, under the unfavorable condition that the machinery cannot enter the site, lead the construction personnel to dig forward with a pick and hoe by manual excavation
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Geological problems such as high ground temperature, high ground stress, mud and water inrush and large deformation of soft rock emerge one after another, becoming the biggest “roadblock” in the construction“ The tunnel is located in the ‘Western Yunnan red bed’, mainly composed of mudstone
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Water and mud gushing never stopped in the process
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“ In the face of various difficulties, we started with scientific construction, invited experts to consult on special geological landforms, timely adjusted the excavation construction method according to the prediction of possible geological problems, and effectively overcome many construction problems by means of advanced geological prediction, strengthening monitoring and measurement management, strengthening advanced and initial support, and strict grouting technology
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It is an important project to improve the road network layout and western development in China’s medium and long term railway network planning
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Since he came to Dali Rui railway in 2009, he has regarded this as his second home
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has undertaken the construction task of 7625m at the entrance section of dapoling tunnel
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” Qiao Zhiqiang, head of dapoling tunnel entrance work area of Darui railway of China Railway Eighth Bureau, introduced
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At present, 20 of the 21 tunnels in Dabao section of Darui railway have been completed, and the last Shanyang tunnel is expected to be completed in August this year; 72% of the beam erection works, 37% of the track laying works, and all the main works of the station building have been completed
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The driving skills of the ‘motorcycle commando’ in our imported work site are all lever..
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“ For 12 years, many of my brothers have chosen to leave because they can’t stand being separated from their family for a long time, and I never thought of leaving even though I am hard and tired, because I have deeply fallen in love with the green mountains and green waters here
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A party member a flag In April 2014, water gushing, mud gushing and collapse occurred at the flat guide face of dapoling tunnel
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▲ CCTV’s live news room “rush out of the earthquake zone! We did it“ On July 29, after 14 years of hard excavation, Dali Ruili railway dapoling tunnel, an important part of the China Myanmar International Corridor constructed by China Railway Eighth Bureau, ran through Dali Ruili railway, with a total length of about 331km
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In February 2010, Yao Wei married his beloved wife at the collective wedding of the project department
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The line crosses Hengduan Mountains
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“Looking at the newly added motorcycle, Yao Wei’s face was filled with a smile
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Among them, dapoling tunnel is located in Yongping County, Dali Prefecture, Yunnan Province, with a total length of 14.66 km
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At that time, Dali Baoshan will be shortened from 2 hours to about 1 hour, and Dali Ruili will be shortened from 6 hours to about 2 hours
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With the joint efforts of all staff, they successfully passed the water and mud inrush section in only 12 days
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” Yao Wei said
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As a typical representative of the hard-working post-80s generation in the project, Yao Wei took the post of deputy manager step by step from an intern“ Darui is my second hometown
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This experience will occupy an important position in my life
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At the same time, constructors work in tunnels with temperatures above 40 degrees Celsius all year round, which is a great test for the builders’ body and mind
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As a railway man, it is my pride in my life to participate in the construction of century projects such as Dali Rui railway
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” Zeng LAN can’t help sighing every time he talks about his experience with the party commando in the dapoling tunnel
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Affected by earthquake and geological landform, dapoling tunnel needs to cross 7 large adverse geological zones, with a relative height difference of more than 1000m and a maximum buried depth of 690m
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Now he is the father of two children“ For 12 years, in order to enter the tunnel faster every time, I learned to ride a motorcycle
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Wu Shugao, then chief engineer of the entrance site of dapoling tunnel and leader of the Party member commando team, calmly fought and made a decisive decision
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The geological conditions are characterized by “three highs” (Highland heat, highland stress and high seismic intensity) and “four activities” (active neotectonic movement, active geothermal water environment, active external dynamic geological conditions and active bank slope shallow transformation process)
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The situation is very urgent
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Due to the serious ponding in the tunnel, the mechanical equipment could not enter, and the constructors could only transport the mud out with small buckets“ If the equipment doesn’t work, let’s do it ourselves
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” In the 12 years of Dali Rui railway, Yao Wei has completed love, marriage and children
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In the water and mud inrush section of just 6 meters, they handled it for 4 months, with an average of 5 cm per day“ Since the construction of Dali Rui railway in 2008, it has been rooted here for 13 years
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Source: Shao JunTi and Yang Yun, editors of the current issue of China Railway Eighth Bureau.
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” Zeng LAN, then deputy manager of Darui railway project division 6 of China Railway Eighth Bureau, led party members to wear rainshoes and raincoats and dig by manual excavation
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This is my ninth ride
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As it is located in the strong earthquake zone of Lancang River in Southwest China, the tunnel has experienced 98 earthquakes of magnitude 3 to 6 in 14 years of construction, which is rare in the history of railway tunnel construction in the world
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Here are my youth and my sweat
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On May 3, 2014, the tunnel face at the horizontal guide entrance of dapoling tunnel burst into water and mud again
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The water gushing at the face exceeded 20 liters per second and the mud gushing exceeded 1000 cubic meters
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Yao Wei, the deputy manager born in 1987, worked with 9 motorcycles at the entrance of dapoling tunnel of China Railway Eighth Bureau in 2012
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The completion of Dali Ruili railway will end the history of no trains in ethnic minority inhabited areas such as Baoshan and Dehong in Yunnan
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” Zhang Shaoxuan, Secretary of the Party branch of the project, said
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All the participants are making full strides towards the goal of opening the Dabao section
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During the construction process, the builders have successively experienced 97 landslides, collapses and landslides of different scales
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The deformation during excavation is great, and the maximum horizontal convergence deformation can reach more than 1m
The whole line is constructed in sections from Dali to Baoshan and from Baoshan to Ruili
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