水泥稳定粒料基层施工中的质量控制技术分析

水泥稳定粒料基层材料具备水稳定性好、刚度大、整体性强、承载能力强和经济适用等诸多优点,故成为目前高级路面施工中的主选材料。在基层施工中应用水泥稳定粒料,可提高路面的整体质量,延长公路的使用寿命。本文针对水泥稳定粒料优势,探讨影响水泥稳定粒料基层强度的因素,并重点分析水泥稳定粒料基层施工中的质量控制技术,以确保基层施工质量。     

水泥稳定粒料基层施工检测控制要点研究

在对《水泥稳定粒料基层施工质量控制标准》进行研究的基础上,介绍了水泥稳定粒料基层底基层施工质量控制要点,深入探讨了其强度指标、压实度指标、平整度指标、厚度指标的测定方法及影响因素,为施工中实测项目的测定方法提供参考,从而保证水泥稳定粒料基层底基层的施工质量。     

浅谈水泥稳定粒料施工技术

水泥稳定粒料是基层施工中应用较广泛的半刚性基层材料，就水泥稳定粒料的性能、施工工序及质量控制作了详细介绍与探讨。     

水泥稳定粒料基层的施工及质量控制

水泥稳定粒料基层具有整体性强、承载能力高、刚度大、水稳性好、经济等特点而被广泛运用于高等级公路上。本文介绍了稳定粒料基层施工及质量控制的方法。通过广州市番禺区金山大道纬线水泥稳定基层的施工实践,详细闸述了水泥稳定碎石基层施工质量控制的关键步骤,以及应注意的几个问题。     

影响水泥稳定粒料基层施工质量的因素及控制方法

结合我单位水泥稳定粒料基层施工工艺、流程及工程实践,本文从压实度指标、平整度指标及厚度指标三个方面讨论影响水泥稳定粒料基层施工质量的因素及控制方法.     

水泥稳定粒料基层裂缝病害的探讨

结合工程实践,阐述了水泥稳定粒料路面基层裂缝的类型及危害,从设计、施工、养护等方面,分析了水泥稳定粒料路面基层产生裂缝的原因,并提出了病害的预防措施,确保了路面的使用性能。     

水泥稳定粒料基层施工及有关问题探讨

水泥稳定粒料基层具有整体性强、承载能力高、刚度大、水稳性好、经济等特点而被广泛运用于高等级公路上。本文介绍了稳定粒料基层施工及质量控制的方法。     

多年冻土地区水泥稳定基层特性研究

研究了水泥稳定砂砾基层的强度形成机理、收缩与抗裂特性,并对水泥稳定粒料基层的配比设计方法进行了分析探讨,从而确定水泥稳定砂砾基层配比,保证了水泥稳定砂砾基层强度的形成,以确保公路路面的施工质量。     

路面水泥稳定基层常见质量通病的预防处理

通过分析水泥稳定基层强度及结构原理,根据路面水泥稳定碎石基层的施工监理经验,对施工中常见的粒料基层质量通病作了归纳,同时提出相应的预防和处理措施,以使路面质量达到设计要求。     

谈水泥稳定类基层和底基层施工

以莱西互通立交枢纽工程为例，介绍了水泥稳定风化岩粒料底基层和水泥稳定碎石基层的施工技术措施，总结了几点成功的经验及今后工作中的一些注意事项。     

水泥稳定粒料基层平整度控制

分析了水泥稳定粒料基层施工中平整度控制的重要性,研究了影响基层平整度的因素,提出了提高基层平整度的对策,以保证道路工程质量,提高道路的行车舒适性。     

对石灰与粉煤灰稳定粒料基层施工的几点认识

结合实际情况,剖析了石灰、粉煤灰稳定粒料作为路面基层的优点,并提出了控制基层施工质量的一些具体措施,对控制公路的质量和使用性能有着重要的意义。     

城市道路大修工程基层快速施工技术

城市道路大修工程施工需及时恢复交通,而常规石灰粉煤灰基层、水泥稳定粒料基层、沥青冷再生基层施工均需养生。本文结合数年大修经验,以香山路大修工程为例,打破传统冷铺方法,根据水泥在温度较高环境下强度快速增长的特性,对摊铺掺加水泥的石灰粉煤灰基层后立即撒布封层并开放交通,次日再加铺沥青混凝土底面层的施工工艺进行探讨。     

Influence of geosynthetic stiffness on bearing capacity of strip footings seated on thin reinforced granular layers over undrained soft clay

Thin granular fill layers are routinely used to aid the construction of shallow footings seated over undrained soft clay foundations and to increase their load capacity. The influence of time- and strain-dependent reduction in reinforcement stiffness on the bearing capacity and load-settlement response of a footing seated on a thin reinforced granular fill layer over undrained soft clay foundations is examined in this paper using finite-difference method (FDM) numerical models. The time- and strain-dependent stiffness of the reinforcement described by a two-component hyperbolic isochronous tensile load-strain model is shown to influence the bearing capacity and load-settlement response of the reinforced granular base scenario. The additional benefit of a reinforced granular layer diminishes as the time-dependent stiffness of the geosynthetic reinforcement increases. An analytical solution for the ultimate bearing capacity of strip footings seated on thin unreinforced and reinforced granular layers over undrained clay is proposed in this study. The main practical outcome from this study are tables of bearing capacity factors to be used with the analytical solution. The bearing capacity factors were back-calculated from the numerical analyses and account for the influence of rate-dependent properties of geogrid reinforcement materials and clay foundations with soft to very soft undrained shear strength.     

Effect of principal stress axis rotation on cyclic plastic deformation characteristics of unsaturated base course material

It is generally observed that the stress state induced through traffic loads inside the substructure of pavements cannot be exactly reproduced in laboratory element tests. Moreover, there are not sufficient studies that examine the behavior of granular material under unsaturated conditions, although such conditions are very prevalent in pavement structures. In this research, an attempt is made to determine the cyclic plastic deformation characteristics of unsaturated granular base course material, and to examine the effect of the rotation of the principal stress axis (experienced by pavement elements under traffic loads) on the mechanical behavior of unsaturated granular base course material by applying various loading methods. A series of laboratory element tests using a multi-ring shear apparatus, which can take into account the rotation of the principal stress axis, were carried out on granular base course material under different moisture contents. The experimental results show that the moisture content has an obvious effect on both the shear behavior and the cyclic plastic deformation of granular base course material. However, the moisture content for the maximum deformation of granular base course material varies according to the loading method. It is also explained that cyclic plastic deformation considerably increases due to the rotation of the principal stress axis under repeated axial and shear loading tests. Therefore, the principal stress axis rotation has a significant influence on the cyclic plastic deformation of unsaturated granular base course material.     

软基处理粒料桩干法施工实践探讨

通过对软基处理粒料桩干法施工的实践,分析了粒料桩干法施工后对地基原状土扰动产生不良效果和不成桩的原因,提出了粒料桩干法施工的局限性,为类似工程软基处理提供借鉴。     

具有碎石基层的半刚性沥青路面合理结构研究

本文在充分考虑碎石基层非线性特性的基础上，采用弹性多层体系迭代方法全面分析了具有碎石上基层的半刚性沥青路面路表弯沉、面层底面及半刚性基层底面弯拉应力，建立了路面结构层厚度与路面抗疲劳寿命的关系，并在此基础上提出了适应于重交通道路的碎石基层半刚性沥青路面合理结构。     

Effect of geogrid in granular base strength – An experimental investigation

An attempt is made to investigate the change in strength characteristics of different granular base materials reinforced with geogrid. The samples tested were both soaked and unsoaked, with and without geogrid to simulate both the best and worse case scenarios. The present investigations focuses only an experimental investigation, but this can set a stage for the development of proper mechanistic design of geogrid reinforced granular base material. The results of the experiment provide guidance for what type of granular material can benefit from reinforcing it with geogrid.     

级配碎石过渡层防裂机理及工程应用

从级配碎石的隔离作用以及作为散粒结构所具有的对裂纹尖端应变能消散、吸收作用两方面阐释级配碎石过渡层的防裂机理,同时,对级配碎石的施工质量控制作了分析,以保证沥青路面施工质量。