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俄亥俄公路处于1935年采用一种土方规范,要求对填土路提及路面基层土壤的压实在含水量及密实度上加以控制。实行这个规范二十年来获得了显著的成效,路堤和路面土基的稳定性显然提高。由于土方施工的改善,路堤因而稳定,很少发生滑坍、沉陷及局部损坏等现象,土基建造相当稳定,足以担负今日繁重的交通量。如果不对土基作含水量及密实度的控制,那么建造成像今日所需要这样稳定的路是不可能的。改善的措施及其对造价的影响俄亥俄州在过去二十年中与改善公路土方质量的同时,进行着对土方运输和压实机械的改善,而且对施工
In 1935, the Ohio Highway adopted a specification of earthwork requiring control over the water content and compaction of the compaction of the soil at the base of the pavement. Significant results have been achieved in implementing this norm over the past two decades, with the stability of embankments and pavement soils clearly improved. Due to the improvement of earthwork construction, the embankment is therefore stable and slips, subsidence and local damage are seldom occurred. The construction of the earth foundation is quite stable and can bear the heavy traffic today. Without the control of the water content and density of the earth’s foundation, it is not possible to build such a stable road as today. IMPROVED MEASURES AND THEIR EFFECTS ON COSTS Ohio has been improving ground transportation and compaction machinery along with improving the quality of highway earthworks over the past two decades,