Optimal Moisture Content Considerations for Dynamic Compaction

在土壤水分调节条件下，对湿陷性土壤进行了室内和田间强夯试验。目的是根据深度和改善程度以及振动衰减程度来确定最佳含水率。改进将通过地表高程变化、基于未分布样本的密度增加、基于锥贯仪测深的强度增加以及基于压力计测试的刚度增加来评估。将努力评价用于预测田间压实最佳水分含量的实验室技术。测试将包括普罗克特在不同能量水平下的湿度密度测试，以及对未受干扰的块样品修整成压实模具的压实测试。验证湿陷性土壤动态压实的最佳水分概念将导致压实效率的提高和土壤的改善，缩短施工时间，降低成本。

Dynamic compaction of collapsible soils under controlled soil moisture conditioning will be performed in laboratory and in the field. The objective is to determine the optimum moisture content based on depth and degree of improvement, and on degree of vibration attenuation. The improvement will be evaluated using surface elevation change, density increase based on undistributed samples, strength increase based on cone penetrometer soundings, and stiffness increases based on pressuremeter testing. Efforts will be made to evaluate laboratory techniques for predicting optimum moisture content for field compaction. Test will include proctor moisture density tests at various energy levels as well as compaction test on undisturbed block samples trimmed into compaction molds. Validation of the optimum moisture concept for dynamic compaction of collapsible soils will result in increased compaction efficiency and soil improvement, shorter construction times, and reduced costs.