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.
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.
The design speed can be appropriately reduced by using old roads and difficult sections locally.
Bridges: for the construction sites with unfavorable geological development such as karst development, goaf and landslide, such as 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 the pile foundation and treatment design scheme shall be optimized in time according to the revealed geological conditions, Ensure the safety of engineering structures.
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The design scheme is generally economical and reasonable, and the setting positions of bridges, tunnels, culverts, channels and other structures are basically appropriate.
The highway starts from zhaile Town, Nayong County, intersects with 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, and accepts Qinglong Xingyi section of Xing expressway, It intersects with Zhenning shengjingguan section of Shanghai Kunming Expressway (xinzhaihe hub is set for interworking).
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.
192) Guizhou naqing Expressway Co., Ltd.: your request for approval of the construction drawing design documents of Nayong Qinglong Expressway (qnaqingcheng [2021] No.
The horizontal and vertical layout of the route well combines the terrain, geology, urban planning and other factors, the overall application of technical indicators is relatively appropriate, the horizontal alignment is relatively smooth, the vertical section design is basically balanced and reasonable, and the horizontal and vertical coordination is relatively coordinated, which meets the requirements of the preliminary design approval（ 2） The relocation scheme of original roads and ditches and the location of culvert channels shall be further verified.
2、 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.
For tunnels with complex engineering geological conditions, such as Gongtong tunnel, Xingou tunnel, Xiaba tunnel, etc., further strengthen the investigation work, find out the distribution of unfavorable geological sections such as coal measure strata, gas, goaf, karst, fault (water rich zone), lithologic contact zone and mud and water inrush, and take targeted design and reliable treatment measures to reduce engineering risks, Ensure project safety.
During construction, construction monitoring shall be strengthened, and the design shall be optimized and improved according to the dynamic design principle to ensure the safety, economy and environmental protection of the slope.
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.
3、 Overall and route design (I) the starting point, ending point and route direction of the construction drawing design route meet the approval opinions of the preliminary design.
The total length of the route is 162.167 km.
It is recommended that each slope reasonably select the support scheme according to the different conditions of rock stratum properties, joints and structural planes, and improve the slope drainage and slope interception and drainage system in deep cut sections, so as to avoid slope water damage.
11 interchange connecting lines with a total length of 104.969 km will be constructed simultaneously（ 2） 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, and the subgrade is 33.5 m wide; Other sections (122.548km) adopt the design speed of 100km / h, the standard of two-way four lane expressway, and the subgrade is 26m wide.
The relocation standards of national and provincial roads and rural roads shall seek the opinions of Provincial Highway Bureau and local transportation bureau to avoid repeated investment and construction（ 3） Strengthen the construction organization design, especially the use of national and provincial roads as construction access sections, and the use length shall be listed as the basis for budget preparation, so as to supplement the design of temporary works such as Prefabrication Yard and mixing yard（ 4） Combined with the traffic safety evaluation report in the preliminary design stage, optimize the overall scheme and take effective measures to effectively improve the operation safety of the project.
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.
504) issued by the Ministry of transport; The application of survey methods and means is reasonable, and the survey content and depth basically meet the requirements of code for Highway Engineering Geological Survey (jtgc20-2011) and construction drawing design（ 2） During the construction, the geological dynamic analysis and monitoring of slope and tunnel shall be further strengthened.
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 situation, 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） The geology of the whole line is complex and there are many deep cut slopes.
938) and the current relevant technical standards, specifications and regulations, the replies are as follows: I Construction scale and technical standards (I) Nayong Qinglong Expressway (the initial approval name is “Nayong Xingyi National Expressway Guizhou Nayong Qinglong section”, and this approval is subject to the project name approved by the project feasibility study) starts from zhaile Town, Nayong County, intersects with Zhijin Nayong section of Xiamen Chengdu Expressway (with zhaile hub), and passes through Zhangjiawan, Jichang, Suoga Yanjiao, Changliu, Zhongying, Huagong, Baisha and Khmer stop at Pu’an tea factory in Po Town, Jiangxi Province, Pu’an County, accept Qinglong Xingyi section of Xing expressway, and intersect Zhenning shengjingguan section of Shanghai Kunming Expressway (Xinzhai River hub is set).
The total length of the route is 162.167 km.
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 found out, and the dynamic adjustment scheme shall be made, While avoiding the impact of geological disasters on project quality and safety as much as possible, optimize the scheme and save the cost（ 3） For the sections that have not been drilled due to special reasons, on the basis of existing data, geological survey, geophysical exploration and other means shall be taken 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（ 4） The following geological problems need to be paid attention to during construction: 1.
Subgrade: in accordance with the requirements of geological survey, the mapping and construction survey of forward slope, landslide, dangerous rock, accumulation, soft soil and Karst Subgrade shall be strengthened to provide a reliable basis for subgrade stability analysis and evaluation.
266)..
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Tunnel: Advance Geological Prediction (exploratory hole) during construction shall be strengthened to verify and improve the geological data of the construction site, so as to provide a reliable basis for dynamic design and dynamic construction.
There are 17 interchanges in the whole line, including zhaile (hub), Nayong West, Zhangjiawan, Jichang, suoja, Xinhua, Yanjiao East (hub), Yanjiao West (hub), Yuzhi, Zhongzhai (Tianshengqiao), Houchang, Changliu, Zhongying, Huagong, Baisha, Khmer and xinzhaihe (hub).
4、 Subgrade and pavement (I) agree with the standard cross-section type, design parameters and general subgrade design principles of Subgrade in principle（ 2） The project has a large bridge tunnel ratio, complex topographic and geological conditions and a large amount of subgrade excavation and waste.
The design load grade of bridges and culverts is highway – I, and other technical indexes are implemented in accordance with the technical standard for Highway Engineering (jtgb01-2014).
44) and relevant attachments have been received.
