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DOI	10.1007/s11440-016-0466-4
	A fractional order creep constitutive model of warm frozen silt
	Liao, Mengke; Lai, Yuanming; Liu, Enlong; Wan, Xusheng
发表日期	2017
ISSN	1861-1125
EISSN	1861-1133
起始页码	377
结束页码	389
卷号	12 期号:2
英文摘要	A series of triaxial creep tests were conducted on warm frozen silts extracted from Qinghai-Tibet Plateau at temperature of -1.5 A degrees C under confining pressures of 0.5, 1.0, and 2.0 MPa, respectively. The applied test stress levels were 30, 50, 60, and 70% of triaxial shear strength, respectively. The test results indicate that the creep strain increases with the increase in applied stress level and there is a stress threshold, based on which the test results can be classified into two types of creep strain curves. The creep strain curve only includes primary and secondary creep stages when the stress level is less than the threshold value. When the stress level exceeds the threshold value, the creep strain velocity gradually increases and the specimen quickly fails in tertiary creep stage. Based on the creep test results, a fractional order rheological element model is established for warm frozen silt, which is also generalized from uniaxial stress state to the three-dimensional stress state. From the analysis on the features of the stress threshold, a creep strength criterion is also proposed simultaneously. Comparing the calculated results of the warm frozen silt with the tested ones, it is found that the predicted results of the proposed model are in good agreement with the test results. In the proposed fractional order model, the relationship between the damage factor and time is established to describe the damage degree of the specimen. Compared with the existing creep constitutive model of frozen soil, the proposed fractional order model has advantages of fewer model parameters, higher simulation precision and wider applicability in analyzing the mechanical properties of warm frozen silt.
英文关键词	Creep constitutive model; Creep strength; Fractional calculus; Strain damage; Warm frozen slit
语种	英语
WOS研究方向	Engineering
WOS类目	Engineering, Geological
WOS关键词	BEHAVIOR ; CRITERION ; EQUATIONS ; SOILS
WOS记录号	WOS:000398720600010
来源期刊	ACTA GEOTECHNICA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239478
作者单位	[Liao, Mengke; Lai, Yuanming; Liu, Enlong; Wan, Xusheng] Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China; [Liao, Mengke; Wan, Xusheng] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Lai, Yuanming] Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou 730070, Peoples R China; [Liu, Enlong] Sichuan Univ, Coll Water Resource & Hydropower, State Key Lab Hydraul & Nat River Engn, Chengdu 610065, Peoples R China
推荐引用方式 GB/T 7714	Liao, Mengke,Lai, Yuanming,Liu, Enlong,et al. A fractional order creep constitutive model of warm frozen silt[J],2017,12(2).
APA	Liao, Mengke,Lai, Yuanming,Liu, Enlong,&Wan, Xusheng.(2017).A fractional order creep constitutive model of warm frozen silt.ACTA GEOTECHNICA,12(2).
MLA	Liao, Mengke,et al."A fractional order creep constitutive model of warm frozen silt".ACTA GEOTECHNICA 12.2(2017).