In 2022,four earthquakes with M_(S)≥6.0 including the Menyuan M_(S)6.9 and Luding M_(S)6.8 earthquakes occurred in the North-South Seismic Zone(NSSZ),which demonstrated high and strong seismicity.Pattern Informatics(...In 2022,four earthquakes with M_(S)≥6.0 including the Menyuan M_(S)6.9 and Luding M_(S)6.8 earthquakes occurred in the North-South Seismic Zone(NSSZ),which demonstrated high and strong seismicity.Pattern Informatics(PI)method,as an effective long and medium term earthquake forecasting method,has been applied to the strong earthquake forecasting in Chinese mainland and results have shown the positive performance.The earthquake catalog with magnitude above M_(S)3.0 since 1970 provided by China Earthquake Networks Center was employed in this study and the Receiver Operating Characteristic(ROC)method was applied to test the forecasting efficiency of the PI method in each selected region related to the North-South Seismic Zone systematically.Based on this,we selected the area with the best ROC testing result and analyzed the evolution process of the PI hotspot map reflecting the small seismic activity pattern prior to the Menyuan M_(S)6.9 and Luding M_(S)6.8 earthquakes.A“forward”forecast for the area was carried out to assess seismic risk.The study shows the following.1)PI forecasting has higher forecasting efficiency in the selected study region where the difference of seismicity in any place of the region is smaller.2)In areas with smaller differences of seismicity,the activity pattern of small earthquakes prior to the Menyuan M_(S)6.9 and Luding M_(S)6.8 earthquakes can be obtained by analyzing the spatio-temporal evolution process of the PI hotspot map.3)The hotspot evolution in and around the southern Tazang fault in the study area is similar to that prior to the strong earthquakes,which suggests the possible seismic hazard in the future.This study could provide some ideas to the seismic hazard assessment in other regions with high seismicity,such as Japan,Californi,Turkey,and Indonesia.展开更多
This article examines the soft soil roadbed reinforcement technology for widened sections of highways in a specific project.It provides an overview of the project,the principles of soft soil roadbed reinforcement tech...This article examines the soft soil roadbed reinforcement technology for widened sections of highways in a specific project.It provides an overview of the project,the principles of soft soil roadbed reinforcement technology for wide sections,and its practical application.The analysis aims to offer guidance on applying soft soil roadbed wide section reinforcement technology and enhancing the overall quality of similar projects.展开更多
Road traffic conditions can have an important impact on the economic development of various regions.Under the background of rapid social and economic development,more and more expressway construction projects are init...Road traffic conditions can have an important impact on the economic development of various regions.Under the background of rapid social and economic development,more and more expressway construction projects are initiated in various regions,including both new expressways and expansion of old expressways,and interchange design plays an important role.Scientific and reasonable interchange design can not only realize energy saving and low carbon footprint,but also be people-oriented and promote regional economic development.Therefore,this paper mainly analyzes the highway route and its interchange design strategy for reference.展开更多
With the rapid development of the socio-economy and the growing demand for transportation,highways have become an indispensable and important part of the modern transportation network.The design of highway routes and ...With the rapid development of the socio-economy and the growing demand for transportation,highways have become an indispensable and important part of the modern transportation network.The design of highway routes and interchanges is a key link in highway construction,which directly affects the efficiency,safety,and traffic smoothness of highways.Based on this,this article analyzes in detail the highway route design and the design of two common interchanges,in order to improve the highway route design and the quality and efficiency of highway construction.展开更多
The construction and operation of expressways will also bring a series of environmental and ecological problems,such as land use conflicts,ecological damage,environmental pollution,etc.In order to solve such problems,...The construction and operation of expressways will also bring a series of environmental and ecological problems,such as land use conflicts,ecological damage,environmental pollution,etc.In order to solve such problems,it is necessary to strengthen the application of landscape ecology.From the perspective of landscape ecology,this paper first introduces the impact of expressways on the ecological environment,and then analyzes the principles of expressway ecological landscape design.Landscaping,ecological environment,customer satisfaction,and other aspects have all performed well,with an optimization rate of over 90%.Future expressway design can strengthen the application of landscape ecology.展开更多
China's road network consists of numerous older expressways experiencing high traffic volumes and severe congestion,necessitating urgent reconstruction and expansion efforts.This study discusses the reconstruction...China's road network consists of numerous older expressways experiencing high traffic volumes and severe congestion,necessitating urgent reconstruction and expansion efforts.This study discusses the reconstruction and expansion project of the Yinkun Expressway's Chongqing High-tech Zone to Rongchang District section,with a detailed exploration of the entire design process.Through a comprehensive analysis,the strengths and weaknesses of different plans are examined,so as to determine the optimal plan.The design chosen saves costs while effectively addressing traffic demands.Additionally,the study summarizes the valuable design insights gained from this interchange transformation,aiming to provide valuable reference for similar interchange projects in the future.展开更多
The significance and the strategies of applying the reliability design method of longitudinal slope length in expressway engineering were explored in this study.The objective is to offer insights that can be beneficia...The significance and the strategies of applying the reliability design method of longitudinal slope length in expressway engineering were explored in this study.The objective is to offer insights that can be beneficial for designing longitudinal slope lengths in contemporary expressway projects,with a focus on enhancing their reliability and safety.展开更多
在全面推广高速公路差异化收费背景下,针对如何选取差异化收费路段的问题,建立一种基于多源数据的差异化收费路段识别方法.首先,基于高速公路门架数据、收费站出入口流量、普通国省道交通流量自动观测站数据等多源数据,从路段沿线社会...在全面推广高速公路差异化收费背景下,针对如何选取差异化收费路段的问题,建立一种基于多源数据的差异化收费路段识别方法.首先,基于高速公路门架数据、收费站出入口流量、普通国省道交通流量自动观测站数据等多源数据,从路段沿线社会经济发展水平、网络化水平、交通运行特征、交通可转移性、交通负荷均衡性5个维度,构建高速公路差异化收费路段识别指标体系.然后,基于k-means聚类和分类回归树算法(Classification and Regression Trees,CART)建立高速公路差异化收费路段识别模型.最后,以云南省130条高速公路路段为例,提取高速公路差异化收费路段细分规则及关键特征指标.研究结果表明:影响高速公路差异化收费路段细分的关键特征指标分别为路段成网率、收费站节点度、出行成本偏差率、路段全天小时拥挤度、可替代路径数量;根据决策树细分规则可将差异化收费路段划分为差异化上浮型、不适合差异化、差异化下浮型3种,符合高速公路实际收费运营情况.展开更多
基金the National Natural Science Foundation of China Study on the Theory and Methods of Deterministic-Probabilistic(No.U2039207)the National Key Research and Development Program of China‘CSEP China in the Context of China Seismic Experimental Site’(No.2018YFE0109700).
文摘In 2022,four earthquakes with M_(S)≥6.0 including the Menyuan M_(S)6.9 and Luding M_(S)6.8 earthquakes occurred in the North-South Seismic Zone(NSSZ),which demonstrated high and strong seismicity.Pattern Informatics(PI)method,as an effective long and medium term earthquake forecasting method,has been applied to the strong earthquake forecasting in Chinese mainland and results have shown the positive performance.The earthquake catalog with magnitude above M_(S)3.0 since 1970 provided by China Earthquake Networks Center was employed in this study and the Receiver Operating Characteristic(ROC)method was applied to test the forecasting efficiency of the PI method in each selected region related to the North-South Seismic Zone systematically.Based on this,we selected the area with the best ROC testing result and analyzed the evolution process of the PI hotspot map reflecting the small seismic activity pattern prior to the Menyuan M_(S)6.9 and Luding M_(S)6.8 earthquakes.A“forward”forecast for the area was carried out to assess seismic risk.The study shows the following.1)PI forecasting has higher forecasting efficiency in the selected study region where the difference of seismicity in any place of the region is smaller.2)In areas with smaller differences of seismicity,the activity pattern of small earthquakes prior to the Menyuan M_(S)6.9 and Luding M_(S)6.8 earthquakes can be obtained by analyzing the spatio-temporal evolution process of the PI hotspot map.3)The hotspot evolution in and around the southern Tazang fault in the study area is similar to that prior to the strong earthquakes,which suggests the possible seismic hazard in the future.This study could provide some ideas to the seismic hazard assessment in other regions with high seismicity,such as Japan,Californi,Turkey,and Indonesia.
文摘This article examines the soft soil roadbed reinforcement technology for widened sections of highways in a specific project.It provides an overview of the project,the principles of soft soil roadbed reinforcement technology for wide sections,and its practical application.The analysis aims to offer guidance on applying soft soil roadbed wide section reinforcement technology and enhancing the overall quality of similar projects.
文摘Road traffic conditions can have an important impact on the economic development of various regions.Under the background of rapid social and economic development,more and more expressway construction projects are initiated in various regions,including both new expressways and expansion of old expressways,and interchange design plays an important role.Scientific and reasonable interchange design can not only realize energy saving and low carbon footprint,but also be people-oriented and promote regional economic development.Therefore,this paper mainly analyzes the highway route and its interchange design strategy for reference.
文摘With the rapid development of the socio-economy and the growing demand for transportation,highways have become an indispensable and important part of the modern transportation network.The design of highway routes and interchanges is a key link in highway construction,which directly affects the efficiency,safety,and traffic smoothness of highways.Based on this,this article analyzes in detail the highway route design and the design of two common interchanges,in order to improve the highway route design and the quality and efficiency of highway construction.
文摘The construction and operation of expressways will also bring a series of environmental and ecological problems,such as land use conflicts,ecological damage,environmental pollution,etc.In order to solve such problems,it is necessary to strengthen the application of landscape ecology.From the perspective of landscape ecology,this paper first introduces the impact of expressways on the ecological environment,and then analyzes the principles of expressway ecological landscape design.Landscaping,ecological environment,customer satisfaction,and other aspects have all performed well,with an optimization rate of over 90%.Future expressway design can strengthen the application of landscape ecology.
文摘China's road network consists of numerous older expressways experiencing high traffic volumes and severe congestion,necessitating urgent reconstruction and expansion efforts.This study discusses the reconstruction and expansion project of the Yinkun Expressway's Chongqing High-tech Zone to Rongchang District section,with a detailed exploration of the entire design process.Through a comprehensive analysis,the strengths and weaknesses of different plans are examined,so as to determine the optimal plan.The design chosen saves costs while effectively addressing traffic demands.Additionally,the study summarizes the valuable design insights gained from this interchange transformation,aiming to provide valuable reference for similar interchange projects in the future.
文摘The significance and the strategies of applying the reliability design method of longitudinal slope length in expressway engineering were explored in this study.The objective is to offer insights that can be beneficial for designing longitudinal slope lengths in contemporary expressway projects,with a focus on enhancing their reliability and safety.
文摘在全面推广高速公路差异化收费背景下,针对如何选取差异化收费路段的问题,建立一种基于多源数据的差异化收费路段识别方法.首先,基于高速公路门架数据、收费站出入口流量、普通国省道交通流量自动观测站数据等多源数据,从路段沿线社会经济发展水平、网络化水平、交通运行特征、交通可转移性、交通负荷均衡性5个维度,构建高速公路差异化收费路段识别指标体系.然后,基于k-means聚类和分类回归树算法(Classification and Regression Trees,CART)建立高速公路差异化收费路段识别模型.最后,以云南省130条高速公路路段为例,提取高速公路差异化收费路段细分规则及关键特征指标.研究结果表明:影响高速公路差异化收费路段细分的关键特征指标分别为路段成网率、收费站节点度、出行成本偏差率、路段全天小时拥挤度、可替代路径数量;根据决策树细分规则可将差异化收费路段划分为差异化上浮型、不适合差异化、差异化下浮型3种,符合高速公路实际收费运营情况.