As a kind of special soil, the physical and mechanical properties of peat soil have a great influence on the construction of the project. In order to investigate the physical and mechanical properties of plateau bog phase peat soil, a series of indoor physical and mechanical tests were carried out on peat soil samples belonging to the Quaternary bog phase stratum exposed in the foundation pit of the 14th Water Purification Plant in Kunming City, and the basic physical properties, consolidation and deformation properties, and shear strength properties of the peat soil were analyzed. The test results showed that: the peat soil showed poor engineering properties, with high water content, high liquid-plastic limit, high compressibility and low shear strength. During the consolidation test of peat soil, with the increase of the normal load received, its pore ratio was approximately linearly decreased, and the unit settlement was approximately linearly increased; the change rule of consolidation and compression coefficient was similar to the trend of increasing first and then decreasing; the compression modulus was inversely proportional to the compression coefficient which was reduced first and then increased. The straight shear test of peat soil has indicated that its shear deformation is dominated by plastic deformation, the damage mode is plastic damage, and the shear stress and shear displacement exhibit the law of growing first and then tends to stabilize.
Guo Yanhui
,
Ma Rui
,
Mao Shilin
,
Fu Xiaobing
,
Liu Xingchen
. Test Study on Physical and Mechanical Properties of Plateau Bog Phase Peat Soil[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S1)
: 70
-76
.
DOI: 10.20174/j.JUSE.2024.S1.09
[1] 桂跃, 余志华, 刘海明, 等. 高原湖相泥炭土固结系数变化规律试验研究[J]. 岩石力学与工程学报, 2016, 35(增1): 3259-3267.
[2] 陶然, 王荣, 范衍琦, 等. 超高含水率水泥固化泥炭土压缩模量和固结系数研究[J]. 硅酸盐通报, 2022, 41(1): 60-67.
[3] 桂跃, 方超, 徐其富, 等. 昆明泥炭土工程性质原生各向异性试验研究[J]. 地下空间与工程学报, 2020, 16(4): 993-1003.
[4] 李育红, 周庆云, 程芸. 滇池湖相泥炭土固结系数及次固结系数研究[J]. 工程勘察, 2019, 47(5): 26-32.
[5] 冯瑞玲, 吴立坚, 张益铭. 泥炭土的固结特性试验研究[J]. 地下空间与工程学报, 2019, 15(5): 1384-1392.
[6] 张蕾, 闫吉祥, 曹净, 等. 基于变异性分析的滇池泥炭土的小范围空间分布规律及物理力学性质[J]. 自然灾害学报, 2022, 31(2): 176-185.
[7] 桂跃, 付坚, 侯英杰, 等. 高分解度泥炭土直剪抗剪强度特性及机理[J]. 河海大学学报(自然科学版), 2016, 44(5): 418-426.
[8] 桂跃, 余志华, 刘海明, 等. 高原湖相泥炭土次固结特性及机理分析[J]. 岩土工程学报, 2015, 37(8): 1390-1398.
[9] 何仕娟, 王志良, 瞿嘉安, 等. 昆明泥炭土直剪蠕变特性及长期强度试验研究[J]. 土木工程学报, 2019, 52(增1): 16-22.
[10] 王竟宇, 王志良, 申林方, 等. 单向压缩状态下滇池泥炭土的蠕变特性研究[J]. 地下空间与工程学报, 2020, 16(6): 1689-1695,1704.
[11] 程芸, 李育红, 丁海涛, 等. 滇池北岸泥炭土工程特性垂向变化规律研究[J]. 工程勘察, 2022, 50(2): 38-45.
[12] Li W C, O' Kelly B C, Yang M, et al. Compressibility behaviour and properties of peaty soils from Dian-Chi Lake area, China[J] Engineering Geology, 2020, 277: 105778.
[13] Sarkar G, Sadrekarimi A. Compressibility and monotonic shearing behaviour of Toronto peat[J]. Engineering Geology, 2020, 278: 105822.
[14] Roesyanto, A Ramayanti. Review of consolidation test on peat soil of Batubara Regency Sumatera Utara Province[J]. IOP Conference Series: Materials Science and Engineering, 2020, 801: 012015.
[15] Roesyanto, Ritonga A. Shear strength parameters of peat soil of district of Asahan by direct shear test[J]. IOP Conference Series: Materials Science and Engineering, 2020, 801: 012013.
[16] 中华人民共和国住房和城乡建设部.土工试验方法标准(GB/T 50123-2019)[S]. 北京: 中国计划出版社, 2019.
[17] Sing W L, Hashim R, Ali F H. Compression rates of untreated and stabilized peat soil [J]. Electronic Journal of Geotechnical Engineering, 2008, 13:1-13.
[18] Nash D F T, Sills G C, Davison L R. One-dimensional consolidation testing of soft clay from Bothkennar[J]. Geotechnique, 1992, 42(2): 241-256.
[19] 余湘娟, 殷宗泽, 董卫军. 荷载对软土次固结影响的试验研究[J]. 岩土工程学报, 2007, 29(6): 913-916.
