A bi-objective optimization framework for three-dimensional road alignment design

Optimization of three-dimensional road alignments is a nonlinear non-convex optimization problem. The development of models that fully optimize a three-dimensional road alignment problem is challenging due to numerous factors involved and complexities in the geometric specification of the alignment. In this study, we developed a novel bi-objective optimization approach to solve a three dimensional road alignment problem where the horizontal and vertical alignments are optimized simultaneously. Two conflicting cost objective functions, earthwork cost and the utility cost, are cast in a bi-objective optimization problem. We numerically compare several multi-objective optimization solvers, and find that it is possible to determine the Pareto front in a reasonable time.     

土工格栅技术在高速公路软土路基处理中的应用

对双向加筋复合土工格栅的应用及施工工艺,结合津汕高速公路具体工程做了较为详尽的阐述,通过使用土工格栅,保证了软基不软、涵洞不沉,压实度达到高标准.     

山区公路填挖交界路基病害及工程处理研究

分析了填挖交界路基病害的主要原因,对填挖交界路基的设计和工程处理中的几个问题进行了分析探讨。     

Key factors controlling the real exhaust emissions from earthwork machines

This study focuses on the actual exhaust emissions of regulated and unregulated pollutants from earthwork machines (EM). In addition to providing a realistic assessment of gaseous and particulate emissions from key EM and filling critical data gaps in emission inventories, it emphasizes the importance of breaking down the average operating emission factors into task-related emission factors (TEF). The latter serve many goals, namely by: categorizing EM in relation to their emission dynamics, finding emission determinants and proposing on-site emission mitigation strategies. These have also led to a more refined analysis of both the effectiveness of EU and US emissions standards and the accuracy of NONROAD2008 model. Ultimately, by using task-related emission factors in conjunction with data available from the literature and with the methodology developed by US-EPA, a lower bound was estimated for gaseous exhaust emissions from the major construction vehicles operable at earthwork sites.     

土工合成材料施工质量监理探讨

结合工程实践,从施工监理的角度阐述土工合成材料施工质量监理工作内容,提出土工合成材料施工质量监理要点,为保证公路工程的土工合成材料施工质量提供可靠依据。     

土工合成材料铺设层位对路面结构的影响分析

以沈阳桃仙机场高速公路改扩建工程项目为依托,重点分析讨论加筋结构在行车荷载作用和地基沉降变形所产生的荷载作用下,土工合成材料的不同铺设层位对路面结构的影响程度,并通过工程实践验证,从而为高速公路改扩建工程新旧路基衔接部处理提供新的理论依据。     

白改黑路面改造项目防治反射裂缝的技术控制

结合油城路路面白改黑改造实际情况,介绍改性沥青在改造项目上的应用,对其使用的材料及特性进行分析,在旧路改造中铺设土工格栅能有效控制反射裂缝,并能延长道路的使用寿命.     

张家口至涿州高速公路设计体会

张家口至涿州高速公路是一条设计难度较大的高速公路,包括平原、山岭微丘、山领重丘等各种地形,同时具有湿陷性黄土地基、8度抗震、大跨高墩等诸多设计难点。对张家口至涿州高速公路设计过程中的主要问题进行分析研究,为今后的高速公路设计提供参考。