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| 水泥改良花岗岩残积土的强度和
崩解特性研究 |
| Research on thestrength and disintegration characteristics of the granite residual soil improved with cement |
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| DOI： |
| 中文关键词: 花岗岩残积土，崩解性，土体改良，水泥掺入量 |
| 英文关键词: granite residual soil disintegration soil improvement cement content |
| 基金项目:湖南科技大学 土木工程学院, 湖南 湘潭 411201 |
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| 中文摘要: |
| 直接将花岗岩残积土用作路基填筑，易产生溜坍、滑坡等病害.为了消除花岗岩残积土不良特性，对湖南省南岳地区花岗岩残积土粒径级配进行研究，得出该地区花岗岩残积土为砂质粘性土，为了提高其填筑路基的性能，采用不同掺入量的水泥对其进行改良，在压实度均为90%的条件下，利用SLB-1型应力应变控制式三轴剪切渗透试验仪和自制崩解仪对各组试样分别进行三轴试验和崩解试验.改良的花岗岩残积土的抗剪强度和崩解试验结果表明，随着水泥掺量的增加，其抗剪强度逐步提高，遇水崩解状况得到逐步改善，当水泥掺入量达到6%时，能大幅提高花岗岩残积土的抗剪强度，其耐崩解性也得到了大幅度的提高和改善，可达到实际工程中改良当地花岗岩残积土的目的.
关键词：花岗岩残积土，崩解性，土体改良，水泥掺入量 |
| 英文摘要: |
| Topsoil slip, landslides and other engineering disease are likely to occur when granite residual soil is directly used as sub grade filling. In order to eliminate the adverse properties of granite residual soil，the grain composition of granite residual soil of Nanyue Mountain Area in Hunan Province was analyzed, and it shows that granite residual soil belongs to the sandy clay. In order to improve the performance when granite residual soil was used as sub grade filling, it was improved with different admixture of cement. When the compaction degree of granite residual soil is 90%, Laboratory triaxial test and laboratory disintegration test were conducted with the SLB-1 triaxial and permeability apparatus and the homemade disintegration test apparatus. The shear strength and disintegration test of improved granite residual soil shows that the shear strength and the disintegrating conditions under the influence of water was gradually improved with the increase of cement content. The shear strength was greatly improved and resistance of disintegration gets a better improvement with 6% cement content. It can also achieve the purpose of improving local granite residual soil in practical engineering. |
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