| 1. | Method for subgrade construction in expansive soil area
膨胀土地区路基施工的方法 |
| 2. | Subgrade construction of high grade highway reconstruction in mountain and hill terrain
山岭重丘区高等级公路改建工程路基施工 |
| 3. | Based on the feature of subgrade construction and with the analysis of the observed settlement data , a series of stress - strain isochrones are arranged in this paper
本文基于高速公路路基填筑的特点，通过实测沉降资料的分析，整理出一系列应力应变等时曲线。 |
| 4. | Abstract : on the basis of subgrade construction practice in qinhuangdao shenyang special passenger line , exploration is made on treatment of subgrade base and construction technology of subgrade reclamation
文摘:结合秦沈铁路客运专线路堤施工实际，通过试验对路基基底处理和路基填筑施工工艺进行了探讨。 |
| 5. | But according to the survey result of filling characteristic of the area that jing - hu high - speed railway is going to pass through , the eligible filling is very poor . it will be very expensive if the all filling that used in subgrade construction transported form other region
但根据已经进行的京沪高速铁路沿线填料调查结果，京沪线沿线合格的填料很少，如果完全依靠远运合格填料，不仅是不经济的，实际实施上也是不可能的。 |
| 6. | Collapsible loess has a wide distribution in midwest china , which in some extent , impacts the subgrade construction and the forming quality of highway engineering ; this thesis explores corresponding construction strategies through mathematical analysis combined with practical experience summary
摘要湿陷性黄土国内中西部地区分布较广，给公路工程的路基施工和成形质量造成一定的影响；本文通过数理分析结合实践经验总结探索了相应的施工对策。 |
| 7. | In the last part of the thesis the key points are given with the detailed analysis and summarizing for dynamic control technology in subgrade construction , namely the calculations for the settlement in subgrade construction , including the calculation methods for the dynamic control in pre - compacting period , the burying of settlement plates , and the final settlement of the subgrade
本文最后重点对路基施工动态控制技术即路基施工过程中沉降量计算进行了详细分析、总结，包括预压期动态控制、沉降板埋设、地基最终沉降计算方法等。 |
| 8. | Based on the investigation and study of impact compaction technology in civil and abroad , this paper discusses the impact compaction working sections that include xining ~ huangyuan , machangyuan ~ pingan , xining ~ taersi and pingan ~ adai expressways . through contrast analysis and generalization of the working sections " test data and aggregate analysis of expressways " test result , this paper studies construction process , construction effect test method and efficiency of loess subgrade construction applied by impact compaction technology in qinghai province
本课题在对国内外有关冲击压实技术调研的基础上，依托西湟公路、马平公路、西塔公路及平阿公路试验段开展冲击压实试验研究，对各个试验段的试验结果进行分析、综合和总结，研究了冲击压实技术在青海黄土路基施工中的施工工艺、施工效果、检测方法及效益等问题。 |
| 9. | Conclusions as following have got through test study : ( 1 ) when impact compaction technology is applied to treat collapsible loess subgrade , the effect depth may be treated generally can not override 80 cm and impact compaction pass is optimum at 30 times . ( 2 ) for stratified impact compaction of subgrade , when compactness of each level reaches codeslstandards loose laying depth of 80 cm fits 40 impact compaction pass is the optimum combination of subgrade construction . when average compactness in each level reaches codeslstandards loose laying depth of 80 cm fits 30 impact compaction pass is the optimum combination o ( 3 ) the quality control method may request impact compaction pass as the main control index and at the same time the final division settlement is less than 10 % of total settlement as large area subgrade is constructed
通过试验研究主要得出如下认识：冲击压实技术处理湿陷性黄土地基时，其有效处理深度一般不超过80cm ，冲压遍数以30遍左右为宜；对路基分层冲压，在要求土体中各点压实度均达到规范要求时，路基冲压最佳组合为虚铺厚度80cm 、冲压40遍；在只要求土体平均压实度达到规范要求时，路基冲压最佳组合为虚铺厚度80cm 、冲压30遍；大面积施工时，质量控制方法可按照在以冲压遍数作为主要控制指标的同时，要求最后10遍分计沉降量小于累计沉降量10 ；在施工单位自己购置冲击压实机情况下，与传统施工相比较，冲击压实技术是一种既能节约资金又能大量缩短工期的施工方法。 |
