紫茎泽兰筋材改良昔格达土物理力学试验研究
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摘要
针对攀西地区特殊昔格达土质,利用广泛分布的紫茎泽兰做改良土筋材,对昔格达紫茎泽兰加筋土进行不固结、不排水的三轴压缩试验,研究不同加筋量及不同围压下加筋土的σ-ε关系曲线和抗剪强度,并分析其影响因素。试验结果表明:昔格达紫茎泽兰加筋土的抗剪强度和抵抗变形的能力较素土有显著提高;内摩擦角φ变化相对较小,相对变化率绝对值在40.13%以内,但黏聚力增长较大,最高可达17.03倍;无筋素土试样大多以剪切破坏为主,而掺入紫茎泽兰筋材后,试样的破坏主要为鼓胀破坏;抗剪强度增加量与紫茎泽兰掺入量的比例呈非线性关系,且并非掺入量越大越好。说明紫茎泽兰筋材对土体存在补强的作用,同时试验得出黏聚力c值是影响加筋土抗剪强度的主要因素。
Xigeda soil material is unique in Panxi region. It was reinforced by Eupatorium adenophorum widespread in Panxi region. Based on unconsolidated undrained triaxial compression tests for the reinforced Xigeda soil in different confined pressures,relation curve of σ-ε and shear strength were analyzed. Compared to plain Xigeda soil,the change in internal friction angle was small and the relative change percentage was less than 40. 13%,while cohesive strength was increased by17. 03 times,therefore reinforced Xigeda soil was significantly improved in shear strength and resistance of deformation. Meanwhile non-linear relationship was presented between shear strength and content of Eupatorium adenophorum. It was concluded by the tests that the value of cohesion c was the main factor influencing the shear strength of the reinforcd soil.
Xigeda soil material is unique in Panxi region. It was reinforced by Eupatorium adenophorum widespread in Panxi region. Based on unconsolidated undrained triaxial compression tests for the reinforced Xigeda soil in different confined pressures,relation curve of σ-ε and shear strength were analyzed. Compared to plain Xigeda soil,the change in internal friction angle was small and the relative change percentage was less than 40. 13%,while cohesive strength was increased by17. 03 times,therefore reinforced Xigeda soil was significantly improved in shear strength and resistance of deformation. Meanwhile non-linear relationship was presented between shear strength and content of Eupatorium adenophorum. It was concluded by the tests that the value of cohesion c was the main factor influencing the shear strength of the reinforcd soil.
引文
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[3]杨舒,李光范,骆俊晖,等.PVC纤维土三轴试验分析[J].北京建筑工程学院学报,2010(4):16-19.
[4]张文举.攀西地区昔格达土工程力学特性试验研究[D].成都:四川大学,2003.
[5]张永治.攀西地区昔格土综述[J].攀枝花大学学报,1995,12(2):75-78.
[6]虞跃,陈廷芳,张俊.水玻璃改良昔格达土物理力学性质的试验研究[J].路基工程,2010(2):84-85.
[7]阮小龙,黄双华.不同石灰配合比对昔格达土性能的影响试验研究[J].西华大学学报,2014,33(1):101-104.
[8]张无敌.恶性有毒杂草紫茎泽兰的利用[J].云南林业科技,1996(1):214-216.
[9]达平馥,洪焰泉.紫荆泽兰的危害特性及研究利用近况[J].林业规划调查,2003,28(1):95-98.
[10]李丽,张无敌,尹芳.紫茎泽兰的各种利用研究[J].农业与技术,2007,27(4):51-54.
[11]陈希哲.土力学地基基础[M].北京:清华大学出版社,2001.
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