The highway starts from zhaile Town, Nayong County, intersects Zhijin Nayong section of Xiamen Chengdu Expressway (with zhaile hub), passes through Zhangjiawan, Jichang, suoja, Yanjiao, Changliu, Zhongying, Huagong, Baisha and Khmer, ends at Pu’an tea factory, Jiangxi Po Town, Pu’an County, accepts Qinglong Xingyi section of Xing’an Expressway, and intersects Zhenning shengjingguan section of Shanghai Kunming Expressway (with xinzhaihe hub) 。 The total length of the route is 162.167 km.
Tunnel: Advance Geological Prediction during construction shall be strengthened (exploratory hole) work to verify and improve the geological data of the construction site, so as to provide a reliable basis for dynamic design and dynamic construction.
III.
(IV) optimize the overall scheme and take effective measures to effectively improve the operation safety of the project in combination with the traffic safety evaluation report in the preliminary design stage.
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II.
Recently, the reporter learned from the website of Guizhou Provincial Department of transportation that the construction drawing design of Nayong Qinglong Expressway (main project) has been approved.
(2) The project has a large bridge tunnel ratio, complex topographic and geological conditions and a large amount of subgrade excavation and waste.
Engineering geological survey (I) The engineering geological survey in the construction drawing design stage meets the requirements of several opinions on Further Strengthening Highway Survey and design (jglf [2011] No.
The design load grade of bridge and culvert is highway – class I, and the other technical indexes are in accordance with the technical standard for Highway Engineering (jtgb01-2014) Implementation.
distribution of unfavorable geological sections such as lithologic contact zone and mud and water inrush, targeted design and reliable treatment measures shall be taken to reduce project risks and ensure project safety.
Bridge: construction sites with poor geological development such as karst development, goaf and landslide For example, yujiayan bridge, Yinfeng bridge, erdaoshui bridge and Chaoyang Bridge, the scale of unfavorable geological bodies shall be further verified before construction, geological review and deformation monitoring during construction shall be strengthened, and pile foundation and treatment design scheme shall be timely optimized according to the revealed geological conditions to ensure the safety of engineering structure.
It is recommended that each slope reasonably select the support scheme according to the different conditions of rock stratum properties, joints and structural planes, improve the slope drainage and slope interception and drainage system in the deep cut section, so as to avoid slope water damage.
According to the reply of the Ministry of transport on the preliminary design of Nayong Qinglong section of Nayong Xingyi National Expressway in Guizhou Province (JGH [2020] No.
266)..
(III) The geology of the whole line is complex and there are many deep cut slopes.
The interchange connecting line is constructed according to the standard of class II Highway, in which the base width of Nayong West and Zhangjiawan connecting lines is 12.0m and the design speed is 60km / h; the base width of other connecting lines is 8.5m and the design speed is 40km / h.
construction scale and technical standards (I) Nayong Qinglong Expressway (the name of the reply to the preliminary design is “Nayong Qinglong section of Guizhou Province of Nayong Xingyi national expressway”, which is subject to the project name approved by the engineering feasibility study, starts from zhaile Town, Nayong County and intersects with Zhijin Nayong section of Xiamen Chengdu Expressway (zhaile hub is set up) It passes through Zhangjiawan, Jichang, suoja, Yanjiao, Changliu, Zhongying, Huagong, Baisha and Khmer, ends at Pu’an tea factory in Po Town, Jiangxi Province, Pu’an County, accepts Qinglong Xingyi section of Xing’an expressway, and intersects Zhenning shengjingguan section of Shanghai Kunming Expressway (with Xinzhai River hub).
504) issued by the Ministry of transport; the application of survey methods and means is relatively reasonable, and the survey content and depth basically meet the requirements of code for Highway Engineering Geological Survey (jtgc20-2011) and construction drawing design.
Subgrade: in accordance with the requirements of geological survey, the mapping and construction survey of forward slope, landslide, dangerous rock body, accumulation body, soft soil and Karst Subgrade shall be strengthened to provide a reliable basis for subgrade stability analysis and evaluation.
According to the existing data and excavation conditions, the adverse effects of karst, coal measure strata, goaf, landslide, forward slope, collapse, dangerous rock mass, soft soil and other adverse geology and special rock and soil on subgrade, bridge and tunnel shall be further identified, and the dynamic adjustment scheme shall be adopted to avoid geological disasters as far as possible While affecting the quality and safety of the project, optimize the scheme and save the cost.
The horizontal and vertical layout of the route better combines the terrain, geology, urban planning and other factors, the overall application of technical indicators is appropriate, the horizontal alignment is smooth and smooth, and the vertical section is smooth The plane design is basically balanced and reasonable, the horizontal and vertical coordination is relatively coordinated, and meets the requirements of the preliminary design reply.
The total length of the route is 162.167km.
11 interchange connecting lines are constructed simultaneously, with a total length of 104.969 km.
It is recommended to further optimize the design of spoil ground and evaluate the stability of large spoil ground in combination with the on-site construction conditions, so as to avoid secondary disasters caused by highway construction spoil and actively respond to the requirements of the Ministry of transport for green highway construction.
(3) For sections that have not been drilled due to special reasons, geological survey, geophysical exploration and other means shall be taken on the basis of existing data to strengthen engineering geological analysis and verification, focusing on finding out whether there are major adverse geological bodies in the sections, and supplementary drilling shall be carried out in time when conditions are met, so as to avoid large scheme adjustment and affecting the construction period.
subgrade and pavement (I) Agree in principle with the standard cross section type of subgrade, design parameters and general subgrade design principles.
44) and relevant attachments have been received.
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For tunnels with complex engineering geological conditions, such as Gongtong tunnel, Xingou tunnel and Xiaba tunnel, the investigation work should be further strengthened to find out the coal measure strata, Wasi, goaf, karst and faults (water rich zone) I.
(2) the relocation scheme of the original roads and ditches and the setting position of culvert channels shall be further verified, and the relocation standards of national and provincial roads and rural roads shall seek the opinions of the Provincial Highway Bureau and local transportation bureau to avoid repeated investment and construction.
(II) The main line section is constructed according to the standard of four lane and six lane expressway, of which the section in common with anpan (39.619 km) adopts the design speed of 100 km / h and the standard of two-way six lane expressway, with the subgrade width of 33.5 m; the rest sections (122.548 km) The design speed of 100km / h is adopted, the standard of two-way four lane expressway is adopted, and the subgrade is 26m wide.
938) and the current relevant technical standards, specifications and procedures, the reply is as follows: I.
IV.
During the construction, strengthen the construction monitoring, optimize and improve the design according to the dynamic design principle, and ensure the slope stability Safety, economy and environmental protection.
overall and route design (I) The starting point, ending point and route direction of the construction drawing design route comply with the approval opinions of the preliminary design.
(IV) The following geological problems need to be paid attention to during construction: 1.
192) Guizhou naqing Expressway Co., Ltd.: your request for approval of the construction drawing design documents of Nayong Qinglong Expressway (qnaqingcheng [2021] No.
The design speed can be appropriately reduced by using old roads and difficult sections locally.
(II) During construction, the geological dynamic analysis and monitoring of slope and tunnel shall be further strengthened.
(3) Strengthen the construction organization design, especially the use of national and provincial roads as the construction access road section, and the use length shall be listed as the basis for preparing the budget to supplement the design of temporary works such as Prefabrication Yard and mixing yard.
In the construction stage, the construction safety risk assessment of high cutting slope engineering shall be carried out in accordance with the requirements of the Ministry of transport (Jiao’an Jian Fa [2014] No.
Zhaile (hub) is set along the whole line There are 17 interchanges in Nayong West, Zhangjiawan, Jichang, Suoga, Xinhua, Yanjiao East (hub), Yanjiao West (hub), Yuzhi, Zhongzhai (Tianshengqiao), Houchang, Changliu, Zhongying, Huagong, Baisha, Khmer and xinzhaihe (hub).
The design scheme is generally economical and reasonable, and the setting positions of bridges, tunnels, culverts, channels and other structures are basically appropriate.
The specific replies are as follows: the reply of the Provincial Department of transportation on the construction drawing design of Nayong Qinglong Expressway (main project) (qjxjz [2021] No.
