既有路基化学粉末除湿剂的研制与应用-道路与铁道工程专业论文.docxVIP

Development and Application of the Existing Subgrade Chemical Powder Desiccant A Dissertation Submitted for the Degree of Master Candidate：Yao Dianmei Supervisor：Prof.Ma Biao Chang’an University, Xi’an, China i i PAGE PAGE iv 摘 要 公路运营期，路基内部土体含水率处于动态变化状态，且不断增大。路基土体含水 率高于最佳含水率时，存在于路基内部的多余水分，会导致路基湿软，稳定性不足，对 路基及路面带来明显影响。对于路基内部多余水分，目前主要依靠路基修筑初期设置的 排水设施的引导、渗流进行疏干、排除，或对湿软破坏严重的路基采用灌浆、置换挤密 桩等技术进行加固处治。当路基内部土体含水率明显大于最佳含水率，但尚无法依靠引 导、渗流等排水措施排除，也不足以使用加固技术措施的湿软的情况，相关研究较少。 而这一部分水如不及时处理，会明显影响路基强度及承载能力。为此，针对这部分水分 及其引起的问题，应以施工简单、成本小为原则，探索路基土体含水率处治技术。 本研究利用化学除湿剂吸收水分、与水反应、消耗水分的原理，制备了 SCP 除湿剂， 用于除去路基内部含水率大于最佳含水率但又无法依靠排水设施引导排除的水分。通过 化学试验，对 SCP 除湿剂的组分材料、组分比例、制备、性质等展开试验，得出：SCP 除湿剂由氧化钙、铝粉等四种材料组成，氧化钙含量宜为 20%～45%、铝粉含量宜为 35%～45%；采用室内试验模拟路基土样，分析了 SCP 除湿剂对土样含水率、土样温度、 土样密实度等影响，得出：SCP 除湿剂可降低土样含水率、升高土样温度、提高土样干 密度和强度，在此基础上分析了 SCP 除湿剂的作用机理，即除湿与加固；根据试验路修 筑与观测，提出了 SCP 除湿剂处治既有路基施工中的平面布置、尺寸要求、施工过程控 制、施工后检验等施工技术，分析了 SCP 除湿剂处治既有路基技术的社会经济效益，为 此项技术的应用奠定了基础。 关键字：路基，除湿剂，含水率，作用机理，施工技术 Abstract Water content of subgrade within highway operation period，in the dynamic change of state, and growing. Subgrade soil moisture content above the optimum moisture content, there was excess water in the subgrade, would lead to the subgrade marshy, lack of stability, a significant impact on the subgrade and pavement. Now, for excess water within subgrade, the mainly rely on the drainage facilities initial set when subgrade constructed, to guide, seepage dewatering, eliminate; Or use reinforcement treatment technologies, such as grouting, replacement extrusion pile, when the subgrade seriously damaged. When the subgrade internal soil water content was significantly greater than the optimum moisture content, but cannot rely on the guidance, seepage and other drainage measures exclude, still not enough to use reinforcement treatment technologies, study less. But this part of the water if not timely treatment, can significantly affect the subgrade strength and bearing capacity. To this end, for this part of the water and the p