柔性管加筋注浆新技术试验及应用研究

【作者】 王立中；

【导师】 李亮；

【作者基本信息】 中南大学 ， 道路与铁道工程， 2008， 硕士

【摘要】 近年来,随着经济的发展,带动了高速公路的快速发展。在建设高速公路的过程中,有些特殊路段,比如桥头、涵洞和路基交汇处的过渡段,由于现场条件限制,大型压实机械无法在这些区域施工。因而在没有大型压实机械参与施工的条件下,要达到高的压实度比较困难。为了解决压实度困难的问题,可以采用注浆工艺进行处理。本文研究的柔性管注浆加筋技术是通过预先埋设水平塑料注浆花管进行现场单点注浆试验以确定现场注浆参数,包括注浆压力、注浆量、注浆扩散半径和注浆控制标准等。通过对现场试验区域土壤进行注浆前后物理及力学性能比较,从而验证注浆区域的注浆效果。近年来随着计算技术的发展,使得采用数值模拟的方式研究均质土体中的注浆成为可能,本文则利用离散元程序PFC^2D对现场柔性管加筋注浆试验进行了数值模拟研究。本文主要做了以下几方面的工作:（1）通过现场试验研究,获得了柔性管加筋注浆管的铺设间距、预埋设方式以及注浆施工参数和施工工艺,能对同类型回填加固工程采用本新技术施工提供借鉴和指导;（2）通过现场试验研究,得到了如下成果:回填料的平均干密度提高约10.17%,平均空隙比约减小31.12%;承载力在27天自然养护后比正常压实施工时的高出30%～50%;回填料的N₁₀和N_63.5试验的贯入阻力(6天用N₁₀测试和27天用N_63.5测试)较正常压实施工填土高出20%～70%;（3）通过现场试验研究,获得了注浆压力与注浆速率的时程曲线。（4）采用数值模拟的方法,获得了在不同围压条件下浆液扩散范围与注浆压力规律。（5）通过理论分析,获得了柔性管加筋注浆新技术的注浆参数,包括:注浆压力,注浆扩散半径。更多还原

【Abstract】 In recent years, the development of economy has driven the fast development of the freeway. In the process of the freeway construction, due to the limitations of on-the-spot condition, good-sized construction machines are unable to use in some special sections, such as the transitional section in the intersection of the end of bridge, culvert and subgrade. It is more difficult to accomplish the high consolidation without good-sized construction machines participating in construction. In order to solve this problem, cement grouting technology can be adopted.In this thesis, the flexible tube reinforced grouting is accomplished by laying retired plastic grouting tube in advance to operate field single-point grouting test with final achievement of field grouting parameters, including the grouting pressure, grouting capacity, grouting diffusion radius and grouting controlling standard etc. By comparing the physical and mechanical properties of soil in field test area before and after grouting, the grouting effect in corresponding area can be verified. In recent years, with the development of computer technology, it is possible to adopt numerical simulation into grouting issue in uniform soil. The paper deals with the numerical simulation which applies discrete element program into flexible tube reinforced grouting field test. Following contributions are achieved by this thesis:（1） Through field test research, the laying distance, pre-burying mode, grouting parameters and grouting process of the flexible reinforced grouting tube can be obtained. It can provide references and guidance for such kind of backfill consolidation construction with this new technology;（2） By completing the field testing research, statistics can be obtained as followings: the average dry density of backfill has been improved nearly 10.17%, while the average void has decreased 31.12%; the bearing capacity of 27 days on natural maintenance is higher from 30% to 50% than that on normal compact construction; the penetration resistance of the N₁₀ and N_63.5 test (6 days on N₁₀ test and 27 days on N_63.5 test) on backfill is higher 20% to 70% than that on normal compaction construction.（3） The time-path curve of grouting pressure and grouting rate can be obtained through field test research.（4） The law between grouting diffusion range and grouting pressure under different ambient pressures can be obtainded by using numerical simulation method（5） Grouting parameters of the flexible reinforced grouting tube, including grouting pressure and the discrete radius of grouting, can be obtained by theory analysis.更多还原