人工冻结泥炭质土力学特性试验研究&#x0002A;

屈俊童; 王文彬; 浦钧翔; 李昱衡; 刘新月; 刘关栋

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铁道工程学报 ›› 2025, Vol. 42 ›› Issue (1) : 7-12.

长大干线：工程地质与路基

人工冻结泥炭质土力学特性试验研究^*

屈俊童^**, 王文彬, 浦钧翔, 李昱衡, 刘新月, 刘关栋

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Experimental Study on the Mechanical Properties of Artificial Frozen Peat Soil

QU Juntong, WANG Wenbin, PU Junxiang, LI Yuheng, LIU Xinyue, LIU Guandong

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摘要

研究目的：为研究冻结泥炭质土力学特性,利用改进的TSZ-2型全自动应变控制仪分别对滇池湖相沉积泥炭质土进行不同影响因素下的低温无侧限抗压强度试验与三轴剪切试验,讨论不同温度、围压、含水率和加载速率对冻结泥炭质土的峰值强度、变形模量和软化系数的影响,分析冻结泥炭质土的极限承载能力范围,并引入修正姜永东模型对冻结泥炭质土的偏应力-应变曲线进行研究。
研究结论：（1）在不同影响因素下,冻结泥炭质土的峰值强度与围压、含水率、加载速率呈正相关,与温度呈负相关;（2）在试验条件内,冻结泥炭质土的变形模量随着峰值强度的增加呈线性增长,软化系数在0~0.544之间波动,偏应力-应变曲线基本表现为应变软化型,而随着围压的增加逐渐向应变硬化型转变;（3）冻结泥炭质土在-15 ℃~-5 ℃温度范围内的强度可以满足实际工况对冻结壁承载能力要求;（4）基于修正姜永东模型,构建适合冻结泥炭质土的本构模型,并对结果进行验证,具有较好的适用性;（5）本研究成果可为湖相沉积软弱土地区冻结法施工提供参考和借鉴。

Abstract

Research purposes: To study the mechanical properties of artificially frozen peat soil under different influencing factors, the improved TSZ-2 type fully automatic strain control apparatus is used to carry out low-temperature unconfined compression and triaxial shear test on lacustrine sedimentary peat soil of Dianchi lake, respectively, and the effects of different temperatures, confining pressures, moisture contents and loading rates on the peak strength, deformation modulus and softening coefficient of artificial frozen peat soil are discussed. The range of extreme bearing capacity of frozen peat soil is analyzed and the modified JIANG Yongdong’s model is introduced to study the bias stress-strain curve of frozen peat soil.
Research conclusions: (1) Under these different influencing factors, the peak strength of frozen peat soil was positively correlated with the confining pressure, moisture content, and loading rate, and negatively correlated with temperature. (2) Within the test conditions, the deformation modulus of frozen peat soil increases linearly with the increase of peak strength, the softening coefficient fluctuates between 0 and 0.544, and the bias stress-strain curve displays a strain-softening type, which gradually shifts to a strain-hardening type with the increase of the confining pressure. (3) The strength of frozen peat soil in the temperature range of -15 ℃~-5 ℃ can satisfy the requirement of bearing capacity of the frozen wall under actual working conditions. (4) Based on the modified JIANG Yongdong’s model, an ontological model suitable for frozen peat soil is constructed and the results are verified with good applicability. (5) The results of this research can provide a reference for the construction of the frozen method in the area of lake-phase sedimentary soft soil.

导出引用

屈俊童, 王文彬, 浦钧翔, 等. 人工冻结泥炭质土力学特性试验研究^*[J]. 铁道工程学报, 2025, 42(1): 7-12

QU Juntong, WANG Wenbin, PU Junxiang, et al. Experimental Study on the Mechanical Properties of Artificial Frozen Peat Soil[J]. Journal of Railway Engineering Society, 2025, 42(1): 7-12

中图分类号： TU411.3

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