加筋材料对紫色土坡耕地埂坎土壤抗剪强度的影响
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摘要
选择三峡库区典型紫色土坡耕地埂坎为研究对象,通过室内三轴不固结不排水试验(UU)研究加筋对埂坎土壤抗剪特征的影响。结果表明:(1) 3种试验材料加筋土均表现出土壤黏聚力随着加筋量的增加先增大后减小,埂坎土壤黏聚力大小表现为:c_(麦壳)>c_(竹丝)>c_(稻秆)>c_(素土)。埂坎土壤黏聚力最大时,麦壳、竹丝和稻秆的加筋量分别为0.8%,0.5%和0.3%。加筋材料对土壤内摩擦角的影响不明显。(2) 3种加筋材料均能提升土壤抗剪强度。土壤极限主应力差随着加筋量的增加先增大后减小,麦壳、竹丝和稻秆加筋土的极限主应力最大值均出现在最优加筋量处。4种试验围压下,加筋埂坎土极限主应力差最大值均体现出(σ_1-σ_3)_(麦壳)>(σ_1-σ_3)_(竹丝)>(σ_1-σ_3)_(稻秆)>(σ_1-σ_3)_(素土)。(3)最优加筋量条件下,3种加筋埂坎土壤试样在不同试验围压下的应力—应变曲线均呈硬化型。
The typical fieldriges on the purple soil sloping farmlands in the Three Gorges Reservoir area were chosen to study the effects of reinforcement materials on soil shearing strength of fieldriges by laboratory unconsolidated undrained triaxial compression tests. The test results indicateds that:(1) The three tested materials showed that soil cohesion increased first and then decreased with the increasing of reinforcement amount. The cohesion of the fieldriges with different reinforced materials followed the order of c_(wheat husks)>c_(bamboo wool)>c_(rice straw)>c_(unreinforced soil). When the cohesion of fieldriges soil was the largest, the reinforcement amount of wheat husks, bamboo wool and rice straw were 0.8%, 0.5% and 0.3%, respectively. But the effect of reinforcement materials on soil internal angle was not obvious.(2) Compared with unreinforced soil, the shearing strength of fieldriges soil with reinforcement materials all increased. As the reinforcement amount increased, the limit principal stress difference increased and then decreased, and the maximum of the limit principal stress difference all appeared at the optimal reinforcement amount of wheat husks, bamboo wool and rice straw respectively. Under the four kinds of confining pressures, the maximum value of the limit principal stress difference of reinforced fieldriges soil all showed that(σ_1-σ_3)_( wheat husks)>(σ_1-σ_3)_(bamboo wool)>(σ_1-σ_3)_(rice straw)>(σ_1-σ_3)_(unreinforced soil).(3) Under the optimal reinforcement amount, the deviatoric stress-strain curves of three reinforced fieldriges soil samples all displayed a hardening type.
The typical fieldriges on the purple soil sloping farmlands in the Three Gorges Reservoir area were chosen to study the effects of reinforcement materials on soil shearing strength of fieldriges by laboratory unconsolidated undrained triaxial compression tests. The test results indicateds that:(1) The three tested materials showed that soil cohesion increased first and then decreased with the increasing of reinforcement amount. The cohesion of the fieldriges with different reinforced materials followed the order of c_(wheat husks)>c_(bamboo wool)>c_(rice straw)>c_(unreinforced soil). When the cohesion of fieldriges soil was the largest, the reinforcement amount of wheat husks, bamboo wool and rice straw were 0.8%, 0.5% and 0.3%, respectively. But the effect of reinforcement materials on soil internal angle was not obvious.(2) Compared with unreinforced soil, the shearing strength of fieldriges soil with reinforcement materials all increased. As the reinforcement amount increased, the limit principal stress difference increased and then decreased, and the maximum of the limit principal stress difference all appeared at the optimal reinforcement amount of wheat husks, bamboo wool and rice straw respectively. Under the four kinds of confining pressures, the maximum value of the limit principal stress difference of reinforced fieldriges soil all showed that(σ_1-σ_3)_( wheat husks)>(σ_1-σ_3)_(bamboo wool)>(σ_1-σ_3)_(rice straw)>(σ_1-σ_3)_(unreinforced soil).(3) Under the optimal reinforcement amount, the deviatoric stress-strain curves of three reinforced fieldriges soil samples all displayed a hardening type.
引文
[1] 史东梅,蒋平,何文健,等.紫色土坡耕地生物埂土壤抗剪强度对干湿作用的响应[J].农业工程学报,2016,32(24):139-146.
[2] Maji V B, Sowmiyaa V S, Robinson R G. A simple analysis of reinforced soil using equivalent approach[J].International Journal of Geosynthetics and Ground Engineering,2016,2(2):16.
[3] Kanchi G M, Neeraja V S, Sivakumar Babu G L. Effect of anisotropy of fibers on the stress-strain response of fiber-reinforced soil[J].International Journal of Geomechanics,2014,15(1):1-6.
[4] Botero E, Ossa A, Sherwell G, et al. Stress-strain behavior of a silty soil reinforced with polyethylene terephthalate (PET)[J].Geotextiles and Geomembranes,2015,43(4):363-369.
[5] 马强,邢文文,李丽华,等.竹条加筋土的大尺寸直剪试验研究[J].长江科学院院报,2017,34(2):69-74.
[6] 宋维峰,陈丽华,刘秀萍.林木根系的加筋作用试验研究[J].水土保持研究,2008,15(2):99-103.
[7] Zhang C B, Chen L H, Liu Y P, et al. Triaxial compression test of soil-root composites to evaluate influence of roots on soil shear strength[J].Ecological Engineering,2010,36(1):19-26.
[8] 卫杰,张晓明,丁树文,等.黄麻纤维加筋条件对崩岗岩土无侧限抗压强度的影响[J].水土保持学报,2015,29(6):59-63.
[9] 柴寿喜,石茜.加筋长度和加筋率下的稻草加筋土强度特征[J].解放军理工大学学报(自然科学版),2012,13(6):646-650.
[10] 魏丽,柴寿喜,蔡宏洲,等.麦秸秆加筋滨海盐渍土的抗剪强度与偏应力应变[J].土木工程学报,2012,45(1):109-114.
[11] 柴寿喜,王沛,王晓燕.麦秸秆布筋区域与截面形状下的加筋土抗剪强度[J].岩土力学,2013,34(1):123-127.
[12] 蒲玉琳,谢德体,倪九派,等.紫色土区植物篱模式对坡耕地土壤抗剪强度与抗冲性的影响[J].中国农业科学,2014,47(5):934-945.
[13] 张兴玲,胡夏嵩.青藏高原东北部黄土区草本植物根系加筋土的抗剪特性[J].水土保持通报,2013,33(4):185-188.
[14] 王元战,刘旭菲,张智凯,等.含根量对原状与重塑草根加筋土强度影响的试验研究[J].岩土工程学报,2015,37(8):1405-1410.
[15] 陈昌富,刘怀星,李亚平.草根加筋土的室内三轴试验研究[J].岩土力学,2007,28(10):2041-2045.
[16] 李进林,韦杰.三峡库区坡耕地埂坎类型、结构与利用状况[J].水土保持通报,2017,37(1):229-233.
[17] 黎娟娟,韦杰,李进林,等.紫色土坡耕地土质埂坎分层入渗试验研究[J].水土保持学报,2017,31(4):69-74.
[18] Wei J, Shi B, Li J, et al. Shear strength of purple soil bunds under different soil water contents and dry densities: A case study in the Three Gorges Reservoir Area, China[J].Catena,2018,166:124-133.
[19] 唐朝生,施斌,顾凯.纤维加筋土中筋/土界面相互作用的微观研究[J].工程地质学报,2011,19(4):610-614.
[20] 陈昌富,刘怀星,李亚平.草根加筋土的护坡机理及强度准则试验研究[J].公路工程,2006,31(2):14-17.
[21] 余沛,柴寿喜,王晓燕,等.麦秸秆加筋滨海盐渍土的加筋效应及工程应用问题[J].天津城建大学学报,2010,16(3):161-166.
[2] Maji V B, Sowmiyaa V S, Robinson R G. A simple analysis of reinforced soil using equivalent approach[J].International Journal of Geosynthetics and Ground Engineering,2016,2(2):16.
[3] Kanchi G M, Neeraja V S, Sivakumar Babu G L. Effect of anisotropy of fibers on the stress-strain response of fiber-reinforced soil[J].International Journal of Geomechanics,2014,15(1):1-6.
[4] Botero E, Ossa A, Sherwell G, et al. Stress-strain behavior of a silty soil reinforced with polyethylene terephthalate (PET)[J].Geotextiles and Geomembranes,2015,43(4):363-369.
[5] 马强,邢文文,李丽华,等.竹条加筋土的大尺寸直剪试验研究[J].长江科学院院报,2017,34(2):69-74.
[6] 宋维峰,陈丽华,刘秀萍.林木根系的加筋作用试验研究[J].水土保持研究,2008,15(2):99-103.
[7] Zhang C B, Chen L H, Liu Y P, et al. Triaxial compression test of soil-root composites to evaluate influence of roots on soil shear strength[J].Ecological Engineering,2010,36(1):19-26.
[8] 卫杰,张晓明,丁树文,等.黄麻纤维加筋条件对崩岗岩土无侧限抗压强度的影响[J].水土保持学报,2015,29(6):59-63.
[9] 柴寿喜,石茜.加筋长度和加筋率下的稻草加筋土强度特征[J].解放军理工大学学报(自然科学版),2012,13(6):646-650.
[10] 魏丽,柴寿喜,蔡宏洲,等.麦秸秆加筋滨海盐渍土的抗剪强度与偏应力应变[J].土木工程学报,2012,45(1):109-114.
[11] 柴寿喜,王沛,王晓燕.麦秸秆布筋区域与截面形状下的加筋土抗剪强度[J].岩土力学,2013,34(1):123-127.
[12] 蒲玉琳,谢德体,倪九派,等.紫色土区植物篱模式对坡耕地土壤抗剪强度与抗冲性的影响[J].中国农业科学,2014,47(5):934-945.
[13] 张兴玲,胡夏嵩.青藏高原东北部黄土区草本植物根系加筋土的抗剪特性[J].水土保持通报,2013,33(4):185-188.
[14] 王元战,刘旭菲,张智凯,等.含根量对原状与重塑草根加筋土强度影响的试验研究[J].岩土工程学报,2015,37(8):1405-1410.
[15] 陈昌富,刘怀星,李亚平.草根加筋土的室内三轴试验研究[J].岩土力学,2007,28(10):2041-2045.
[16] 李进林,韦杰.三峡库区坡耕地埂坎类型、结构与利用状况[J].水土保持通报,2017,37(1):229-233.
[17] 黎娟娟,韦杰,李进林,等.紫色土坡耕地土质埂坎分层入渗试验研究[J].水土保持学报,2017,31(4):69-74.
[18] Wei J, Shi B, Li J, et al. Shear strength of purple soil bunds under different soil water contents and dry densities: A case study in the Three Gorges Reservoir Area, China[J].Catena,2018,166:124-133.
[19] 唐朝生,施斌,顾凯.纤维加筋土中筋/土界面相互作用的微观研究[J].工程地质学报,2011,19(4):610-614.
[20] 陈昌富,刘怀星,李亚平.草根加筋土的护坡机理及强度准则试验研究[J].公路工程,2006,31(2):14-17.
[21] 余沛,柴寿喜,王晓燕,等.麦秸秆加筋滨海盐渍土的加筋效应及工程应用问题[J].天津城建大学学报,2010,16(3):161-166.
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