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

9360798 Fox提出了一种方法，通过结合小直径、短、稳定、垂直、颗粒状柱的网格来改善和加固用于支持巷道、机场和停车场路面的底土。提议的方法是由提议者开发的一种专利方法的小规模变化，用于加强建筑基础下的承载土壤，该方法最近获得了国家建筑创新奖。柱状物质可以由土壤、含化学剂的土壤、含特殊合成内含物的土壤、人工土壤或石头组成。柱网将使用单一设备同时构建。这种方法对底土的改良具有快速和经济的优点。为了定性和定量地确定可以获得的改善程度，将使用所提出的稳定方法对各种土壤进行有限元分析研究和实验室和现场试验研究计划。实验室试验包括一维压缩试验、三轴试验和大型板承载试验。将在现场进行一系列板承载试验，以及钻孔剪切试验、K0-blade试验和动态贯入试验，现场将制作并用于构建现场试验的颗粒柱。将进行有限元分析，以模拟实验室和现场试验的结果，并对影响改善程度的重要因素进行参数化研究，这些因素可以通过在不同的路基土壤中加入由各种材料构成的颗粒柱来获得。通过这种方式，实验室和现场试验的结果可以外推到试验研究计划中未测试的路基土壤和条件。对分析和实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。＊＊＊

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. ***