粉煤灰固化淤泥路用性能及填筑技术研究
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摘要
随着我国城市化进程加快,交通基础设施建设正处于快速发展的黄金时期,随之引起的环保问题和资源紧缺问题也日益突出。在保证公路建设可持续发展的同时,又能解决环保和资源紧缺问题的有效措施已被日渐关注。
本文将公路路堤填筑材料紧缺问题与淤泥传统抛填产生的环境污染相结合,将粉煤灰加入淤泥,使淤泥固化,通过室内试验研究淤泥粉煤灰固化剂的击实特性、强度特性和水稳定性,并分析了击实延迟和聚丙烯纤维对固化淤泥力学性质的影响。依托江苏省231省道兴化至泰州段(兴泰公路),系统分析粉煤灰固化淤泥填筑路堤的施工技术,主要取得以下研究成果:
(1)粉煤灰固化淤泥的击实试验结果表明:淤泥的最大干密度随粉煤灰掺入量增加而减小,最优含水量随粉煤灰掺入量增加而增加;同时,随着击实延迟时间增加,固化淤泥的最大干密度减小、最优含水量增加;固化淤泥的CBR值随粉煤灰含量的增加而增大。
(2)粉煤灰固化淤泥的三轴试验结果表明:固化淤泥的破坏形式随含水量减小、粉煤灰含量增大,表现为脆性破坏;在粉煤灰固化淤泥中掺加聚丙烯纤维后,试样表现为塑性变形特性;固化淤泥的强度参数(c和φ)随龄期、粉煤灰含量、纤维含量增大而增大;淤泥和粉煤灰在均匀搅拌后,若不及时进行击实,随着时间延迟,击实试样的强度降低;固化淤泥试样在非饱和状态下浸水后,随着时间的增长,含水量变大,强度减小。
(3)现场路堤填筑和质量检测结果表明:淤泥经掺加粉煤灰固化后强度明显提高,含水量、压实度等路用性能指标满足路堤填筑材料要求;在现场施工过程中,应严格按照灰土比换算出的松铺高度要求进行淤泥土和粉煤灰填筑高度量测,控制好灰土比,防止粉煤灰含量过大产生的起皮现象和粉煤灰含量不达标而引起的强度降低问题;同时,应将土颗粒尽力打碎,使得淤泥与粉煤灰充分接触,增大水化反应面积。
With the acceleration of our country urbanization process, traffic infrastructure construction is in the rapid developing golden period,then the environmental protection problem and resources shortage problem followed by it is increasingly outstanding. Highway construction in ensuring sustainable development, while solving the problem of environmental protection and resource scarcity of effective measures at the same time have been of increasing concern.
This paper combines the environmental pollution produced by muddy soil traditional parabolic filling and the inadequacy problem of highway embankment filling materials. We added fly-ash to muddy soils and then solidify muddy soils. By tests we research the compaction characteristics, unconfined compression strength, time delay and water stability of the muddy soil fly-ash curing agent and analyze the effects of compaction delay and polypropylene-fiber on solidified muddy soil. And we systematically analyze the construction technology of the muddy soil fly-ash embankment backfill and constructionfilling embankment which relies on the project of Xing-Tai Road in Jiangsu province .Then we obtain the research results as follows:
1. Compaction test of solidified muddy soil by fly-ash shows that the maximum dry density of muddy soil and fly-ash mixture increased with fly-ash decreases, optimal water content of the mixture increases with the fly-ash increases. After the incorporation of fly-ash sludge, with the increase in delay time tamping, the maximum dry density of improved soils decreases; the optimal w increased. CBR value of the soils increases as the curing agent of fly-ash content increases.
2. Triaxial test of solidified muddy soil by fly-ash shows that improved soils tend to show the trend of brittle failure with water content reduced and fly-ash content increased. c andφof the soils increases with increases of age, fly-ash content, fiber content increases. If the improved soil is not timely tamping, its strength will become lower and lower with the time delay. And the strength of solidified soils in non-saturated silt under the water becomes lower with w increase.
3. The use of solidified muddy soils in construction site showed that the strength of waste muddy soils solidified by fly-ash significantly improves. And engineering parameters like water content and degree of compaction meet the requirements of embankment materials. And we should control the height of muddy soils and fly-ash during construction strictly, and we should make every effort to smash the soil particles to increase the size of the hydration reaction by making full contact with the soils and fly-ash.
本文将公路路堤填筑材料紧缺问题与淤泥传统抛填产生的环境污染相结合,将粉煤灰加入淤泥,使淤泥固化,通过室内试验研究淤泥粉煤灰固化剂的击实特性、强度特性和水稳定性,并分析了击实延迟和聚丙烯纤维对固化淤泥力学性质的影响。依托江苏省231省道兴化至泰州段(兴泰公路),系统分析粉煤灰固化淤泥填筑路堤的施工技术,主要取得以下研究成果:
(1)粉煤灰固化淤泥的击实试验结果表明:淤泥的最大干密度随粉煤灰掺入量增加而减小,最优含水量随粉煤灰掺入量增加而增加;同时,随着击实延迟时间增加,固化淤泥的最大干密度减小、最优含水量增加;固化淤泥的CBR值随粉煤灰含量的增加而增大。
(2)粉煤灰固化淤泥的三轴试验结果表明:固化淤泥的破坏形式随含水量减小、粉煤灰含量增大,表现为脆性破坏;在粉煤灰固化淤泥中掺加聚丙烯纤维后,试样表现为塑性变形特性;固化淤泥的强度参数(c和φ)随龄期、粉煤灰含量、纤维含量增大而增大;淤泥和粉煤灰在均匀搅拌后,若不及时进行击实,随着时间延迟,击实试样的强度降低;固化淤泥试样在非饱和状态下浸水后,随着时间的增长,含水量变大,强度减小。
(3)现场路堤填筑和质量检测结果表明:淤泥经掺加粉煤灰固化后强度明显提高,含水量、压实度等路用性能指标满足路堤填筑材料要求;在现场施工过程中,应严格按照灰土比换算出的松铺高度要求进行淤泥土和粉煤灰填筑高度量测,控制好灰土比,防止粉煤灰含量过大产生的起皮现象和粉煤灰含量不达标而引起的强度降低问题;同时,应将土颗粒尽力打碎,使得淤泥与粉煤灰充分接触,增大水化反应面积。
With the acceleration of our country urbanization process, traffic infrastructure construction is in the rapid developing golden period,then the environmental protection problem and resources shortage problem followed by it is increasingly outstanding. Highway construction in ensuring sustainable development, while solving the problem of environmental protection and resource scarcity of effective measures at the same time have been of increasing concern.
This paper combines the environmental pollution produced by muddy soil traditional parabolic filling and the inadequacy problem of highway embankment filling materials. We added fly-ash to muddy soils and then solidify muddy soils. By tests we research the compaction characteristics, unconfined compression strength, time delay and water stability of the muddy soil fly-ash curing agent and analyze the effects of compaction delay and polypropylene-fiber on solidified muddy soil. And we systematically analyze the construction technology of the muddy soil fly-ash embankment backfill and constructionfilling embankment which relies on the project of Xing-Tai Road in Jiangsu province .Then we obtain the research results as follows:
1. Compaction test of solidified muddy soil by fly-ash shows that the maximum dry density of muddy soil and fly-ash mixture increased with fly-ash decreases, optimal water content of the mixture increases with the fly-ash increases. After the incorporation of fly-ash sludge, with the increase in delay time tamping, the maximum dry density of improved soils decreases; the optimal w increased. CBR value of the soils increases as the curing agent of fly-ash content increases.
2. Triaxial test of solidified muddy soil by fly-ash shows that improved soils tend to show the trend of brittle failure with water content reduced and fly-ash content increased. c andφof the soils increases with increases of age, fly-ash content, fiber content increases. If the improved soil is not timely tamping, its strength will become lower and lower with the time delay. And the strength of solidified soils in non-saturated silt under the water becomes lower with w increase.
3. The use of solidified muddy soils in construction site showed that the strength of waste muddy soils solidified by fly-ash significantly improves. And engineering parameters like water content and degree of compaction meet the requirements of embankment materials. And we should control the height of muddy soils and fly-ash during construction strictly, and we should make every effort to smash the soil particles to increase the size of the hydration reaction by making full contact with the soils and fly-ash.
引文
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[3]朱伟,刘汉龙,高玉峰.工程废弃土的再生资源利用技术[J].再生资源研究, 2001, 7(6):32-35.
[4]朱伟,张春雷,高玉峰等.疏浚泥处理再生资源技术的现状[J].环境科学与技术, 2002, 25(4):39-41.
[5]朱伟.《疏浚泥综合利用技术》项目研究报告[R].南京,河海大学, 2002.
[6]杨永荻,汤怡新.疏浚土的固化处理技术[J].水运工程, 2001, 25(4):12-15.
[7]朱伟,张春雷,高玉峰等.海洋疏浚泥固化处理土基本力学性质研究.浙江大学学报(工学版), 2005, 49(10): 1561-1565.
[8]梁静,侯浩波,周旻等.改性淤泥土作堤岸填筑材料的试验研究[J].粉煤灰综合利用, 2006, 16(4): 31-33.
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