高速公路路面施工中凝岩稳定土的应用

为分析凝岩材料对土料物理力学性能改进的程度以及在高速公路路面结构层施工中应用的技术要点,分别对凝岩稳定土的水稳性、抗疲劳性能进行试验,并以某高速公路段为试验段,对底基层和基层结构凝岩稳定土施工技术要点进行分析。分析结果表明,掺加凝岩材料后,土料表现出明显的岩化特征,水稳性、抗渗性和抗剪强度均不同程度提升,且养护龄期越长,路用性能越好。该材料在公路工程中的推广应用为煤矸石、粉煤灰、赤泥等工业废料的资源化利用提供了可行思路。

土凝岩稳定土底基层性能研究

为满足国家节能环保、绿色经济的发展目标,通过对土凝岩稳定土底基层性能和施工工艺进行全面分析,得出土凝岩稳定土底基层作为一种新型的高性能低碳环保材料能够有效提高经济效益和环境效益,值得在全国范围内全面推广应用。

土凝岩稳定土的性能及应用实例

阐述了土凝岩的基本构成及特性,以实际工程为例,与传统的水泥稳定碎石结构层在设计要求、施工方案及经济性等方面进行对比,并结合施工经验确定经济合理的路面结构方案,以此确保路面结构的强度满足要求,进一步节约工程造价。

土凝岩稳定黏性土的路用性能研究

通过击实试验、无侧限抗压强度试验、水稳定性试验以及抗疲劳性能试验,验证土凝岩稳定黏性土的力学性能及耐久性。试验结果表明:土壤固化剂稳定黏性土的最佳含水率随土壤固化剂掺量的增加而增加。土壤固化剂稳定黏性土的7d无侧限抗压强度均随着固化剂掺量的增加而增加。水稳定性试验表明土凝岩稳定黏性土的早期水稳定性系数略优于水泥稳定黏性土,水化后期两种土壤固化剂稳定黏性土的水稳定系数相当。抗疲劳性能试验表明土凝岩稳定黏性土的劈裂强度和经100次循环载荷作用下的劈裂强度比水泥稳定黏性土分别提高10.53%和15.1%,表现出优良的耐久性。

Development of a new type of foam concrete and its application on stability analysis of large-span soft rock tunnel

The long-term stability of large-span soft rock tunnel is influenced greatly by the creep effect of surrounding rock.The development of a new type of foam concrete which has the property of high compressibility and low ductility was introduced.And it was made as filling material of reserved deformation layer between the first lining and the second lining used in large-span soft rock tunnel.The effect of the new type of foam concrete was simulated as filling material of reserved deformation layer using numerical simulation.Through the comparison with the common large-span soft rock tunnel,the vault settlement and surrounding convergence are reduced by about 61% and 45%,respectively,after creep of 100 a.And in the second lining,the plastic zone reduces apparently and the maximum equivalent plastic strain decreases relatively.So,it can be found that the application of the new type of foam concrete as the filling material of reserved deformation layer can relieve the excessive force in second lining induced by rock creep,reduce its deformation and improve the stability of tunnel.