冻结掺砾黏土应力–应变特性及破坏应变能密度研究

doi:10.13722/j.cnki.jrme.2021.1080

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摘要掺砾黏土是指由黏土和砾石组成的土石混合料，随着众多寒区工程相继投入建设，对其低温力学特性进行研究具有重要意义。首先对常温压实掺砾黏土开展CT扫描试验，得到不同掺砾量试样的骨架和孔隙结构分布特征，随后针对冻结掺砾黏土开展系列无侧限抗压强度试验，研究温度、掺砾量、含水率、加载速率对其应力–应变特性和破坏应变能密度的影响。试验结果表明：冻结掺砾黏土呈现出典型的脆性破坏特征，其破坏特征受温度、掺砾量、含水率和加载速率影响显著；冻结掺砾黏土的破坏应变能密度随温度的升高和掺砾量的增大均降低，随加载速率的增加而非线性增大，并且随含水率的增加呈现出先增加后减小的变化趋势，即存在一个“临界含水率”使得其抵抗破坏能力最强。

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	张勇敢1
	鲁洋1
	2
	刘斯宏1
	2
	王涛1
	毛航宇1

关键词 ：土力学, 冻结掺砾黏土, CT扫描试验, 无侧限抗压强度试验, 应力–应变特性, 破坏应变能密度

Abstract：Clay-gravel mixtures(CGMs) are composed of clay and gravel. With the accelerating construction of engineering projects in cold regions，it is of great importance to figure out the mechanical properties of frozen CGMs. In this study，CT scanning tests were first carried out on compacted CGMs at room temperature，the skeleton structure and pore structure distribution characteristics of samples with different gravel contents were obtained. Besides，a series of unconfined compression tests were carried out on frozen CGMs to study the effects of temperature，gravel content，water content，and loading rate on their stress-strain characteristics and failure strain energy densities. The test results show that frozen CGMs exhibit typical brittle failure characteristics，which are greatly affected by temperature，gravel content，water content and loading rate. The failure strain energy density decreases with increasing temperature and gravel content，and increases nonlinearly with the increase of the loading rate. Furthermore，the failure strain energy density of the frozen CGM first increases and then decreases with water content，indicating there is a“critical water content”at which the frozen CGM bear the strongest resistance to failure.

Key words： soil mechanics frozen clay-gravel mixture CT scanning test unconfined compressive strength test stress-strain behaviour failure strain energy density

引用本文:

张勇敢1，鲁洋1，2，刘斯宏1，2，王涛1，毛航宇1. 冻结掺砾黏土应力–应变特性及破坏应变能密度研究[J]. 岩石力学与工程学报, 2022, 41(S2): 3402-3409.
ZHANG Yonggan1，LU Yang1，2，LIU Sihong1，2，WANG Tao1，MAO Hangyu1. Experimental study on stress-strain behaviour and failure strain energy density of frozen clay-gravel mixtures. , 2022, 41(S2): 3402-3409.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.1080 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS2/3402

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