| 绢云母片岩粗粒料改性试验研究 |
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| 引用本文： | 秦尚林,杨兰强,陈荣辉,熊署丹.绢云母片岩粗粒料改性试验研究[J].岩土力学,2013,34(Z2):105-109. |
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| 作者姓名： | 秦尚林 杨兰强 陈荣辉 熊署丹 |
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| 作者单位： | 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071 |
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| 基金项目： | 国家自然科学基金资助（No.51079142）；湖北省谷城至竹溪高速公路科技项目资助（GZL-KJ-02-01） |
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| 摘 要： | 绢云母片岩属极软岩，强度低，直接作为路基填料难以压实，易造成路基沉陷、路面开裂等不良工程现象。通过对绢云母片岩及其4种改性方案进行表面振动压实试验、室内重型击实试验、室内CBR试验以及回弹模量试验研究，探讨绢云母片岩经改性后用作高速公路路基填料的适用性。试验表明，绢云母片岩最大干密度采用室内重型击实与表面振动压实试验结果相差较大，采用表面振动压实时为1.92 g/cm3，采用室内重型击实时为2.01 g/cm3。主要原因是由于绢云母片岩颗粒破碎的结果。绢云母片岩及其4种改性粗粒土的在最优含水率附近的较宽范围内的变动对压实效果的影响不大，有利于填料的压实。绢云母片岩的回弹模量E较低，小于32 MPa，经改性后的土料的回弹模量均有显著提高，均达到50 MPa以上。添加20%红砂岩和20%黏性土的试料CBR值均只有3.7，添加3%水泥和5%水泥的试料CBR值上升明显。绢云母片岩经添加3%、5%的水泥化学改性后可用于高速公路上路堤及路床填筑。
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| 关 键 词： | 绢云母片岩 CBR试验 回弹模量 改性土 |
| 收稿时间： | 2013-07-02 |
Modified test research of sericite schist coarse aggregates |
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| QIN Shang-lin,YANG Lan-qiang,CHEN Rong-hui,XIONG Shu-dan.Modified test research of sericite schist coarse aggregates[J].Rock and Soil Mechanics,2013,34(Z2):105-109. |
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| Authors: | QIN Shang-lin YANG Lan-qiang CHEN Rong-hui XIONG Shu-dan |
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| Institution: | State Key Laboratory of Geomechanics and Geotechnical Engcneering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | The surface vibration compaction test, indoor heavy compaction test, interior California bearing ratio(CBR) test and modulus of resilience test have been carried out on sericite schist coarse aggregates and four modified soils, because the sericite schist belong to the soft rock, strength low, which is easy to make road collapse and pavement cracking when it as subgrade filling material. Test results shows that it is a big difference in the maximum dry density of sericite schist coarse aggregates by using heavy compaction test in contrast to the surface vibration compaction test. The results of maximum dry density is 2.01 g/cm3 by using heavy compaction test; but another is 1.92 g/cm3. The main reason is that due to particle breakage in sericite schist. The effects of the change of the optimum moisture content is not obvious for sericite schist coarse aggregates, as well as for four modified soils, which is beneficial to compaction. The modulus of resilience of sericite schist coarse aggregates is low, less than 32 MPa. However the modulus of resilience of modified soil have been remarkable improved, up to 50 MPa above all. The CBR both only have 3.7 when blend it with 20% red sandstone or 20% clay. But the CBR ascends obviously when to mix it with 3% or 5% cement. Sericit schist after chemical modification by adding 3%, 5% of cement can be used in the embank kment of highway 94 zone and 96 zone. |
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| Keywords: | sericite schist california bearing ratio(CBR) test modulus of resilience modified soils |
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