Improvement of Subsoils for Support of Pavements Using a Grid of Stabilized Granular Columns

使用稳定粒状柱网格改进地基以支撑路面

• 批准号: 9360798
• 负责人: Nathaniel Fox
• 金额: $ 6.5万
• 依托单位: Earthwater Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-01-01 至 1995-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9360798&HistoricalAwards=false
• 关键词: Improvement; Subsoils; Support; Pavements; Using

9360798 Fox A method is proposed whereby subsoils for support of roadway, airfield, and parking area pavements will be improved and reinforced by the incorporation of a grid of small diameter, short, stabilized, vertical, granular columns. The proposed method is a smaller-scale variation of a patented process developed by the proposers to reinforce bearing soils beneath building foundations, which recently won a national award for innovation in construction. the columnar material can consist of soil, soil with chemical agents, soil with special synthetic inclusions, artificial soil, or stone. The grid of columns will be constructed simultaneously using a single apparatus. The improvement of subsoils in this manner will be rapid and economical many applications. To determine qualitatively and quantitatively there degree of improvement which can be obtained, a finite element analytical study and laboratory and field experimental research programs will be conducted on a variety of soils using the proposed stabilization method. Laboratory tests to be conducted include one-dimensional compression, triaxial, and large-scale plate bearing tests. A series of plate bearing tests, as well as borehole shear, K0-blade, and dynamic penetrometer tests, will be conducted in the field on in-situ will be produced and used to construct the granular columns for the field experiments. The finite element analyses will be conducted to model the results from the laboratory and field tests, and to perform a parametric study of the important factors influencing the degree of improvement which can be obtained from incorporation of granular columns constructed of a variety of materials within a different subgrade soils. In this manner, the results from the laboratory and field tests can be extrapolated to subgrade soils and conditions not tested in the experimental research program. Evaluation of the results from the analytical and experimental studies will establish the feasibility of the proposed meth od for stabilizing subsoils to support pavements. ***

9360798 FOX提出了一种方法，通过采用小直径、短、稳定、垂直、颗粒状的格栅来改善和加固用于支撑道路、机场和停车场路面的地基。拟议的方法是由提出者开发的加固建筑基础下承载土的专利工艺的较小规模变体，该工艺最近获得了全国建筑创新奖。柱状材料可以由土壤、含有化学试剂的土壤、含有特殊合成包裹体的土壤、人造土壤或石头组成。柱网将使用单一设备同时建造。以这种方式改良地基将在许多应用中迅速而经济地进行。为了定性和定量地确定可以获得的改善程度，将使用所提出的固结方法对各种土体进行有限元分析研究以及室内和现场试验研究。将进行的实验室试验包括一维压缩试验、三轴试验和大型平板承载试验。将在现场进行一系列的平板承载试验、钻孔剪切试验、K0叶片试验和动态渗透仪试验，以现场生产并用于建造现场试验的颗粒柱。有限元分析将模拟实验室和现场测试的结果，并对影响改善程度的重要因素进行参数研究，这些因素可以通过在不同的路基土壤中加入由各种材料建造的颗粒桩来获得。通过这种方式，可以将实验室和现场测试的结果外推到路基土壤和实验研究计划中未测试的条件。对分析和试验研究结果的评估将确定所提出的稳定地基以支撑路面的方法的可行性。***