Experimental Study on Dynamic Strength Regional Characteristics of Undisturbed Loess Based on the Mohr-Coulomb Failure Criterion

Abstract:

Based on Mohr - Coulomb failure criterion, dynamic strength characteristic of undisturbed loess in Xining, Lanzhou, Xiji and Xian was studied through dynamic triaxial test. And the regional characteristics of void ratio, natural moisture content, plasticity index and dynamic shear strength with different vibration frequency and natural conditions were analyzed. The research shows that dynamic shear strength of loess increases when consolidation stress rises under the same water content condition. However the increase trend is not proportional relationship. Initial void ratio and water content of loess under natural state rises from northwest to southeast, and dynamic cohesive force enhances. On the contrary, internal friction angle decreases with the change of characteristic. With the increasing trend of disturbed loesss clay content from northwest to southeast, dynamic cohesive force increases and internal friction angle decreases in the different amplitude. The conclusion enriches and develops the evaluation theory of loess regional dynamic characteristic and it is a universal method to reduce cost of different loess regional classification.

• Periodical: Advanced Materials Research (Volume 700)
• Pages: 111-118
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.700.111
• Online since: May 2013
• Authors: Ping Wang, Jun Wang, Shao Feng Chai, Nai Wang
• Keywords: Dynamic Strength, Regional Characteristic, Undisturbed Loess

References

[1] Lanmin Wang, et al. Loess Dynamics, Beijing: China Seismological Press, 2003, "In Chinese".

[2] Weijiang Wu, Nianqin Wang, Gansu landslide disaster, Lanzhou: Lanzhou University press, 2006"In Chinese".

[3] Tiande Miao, Zhongyu Liu, Jiusheng Ren, et al, Journal of geotechnical engineering, 1999, 21(4), 783-787. "In Chinese".

[4] Water conservancy science research institute of Nanjing, Geotechnical test technical manual, Beijing: China Communications Press, 2003, "In Chinese".

[5] Yasheng Luo, Dingyi Xie, Yonghong Li, et al. Collapsible loess research and engineering, Beijing：China building industry press, 2001,"In Chinese".

[6] Jiahuan Qian, Zongze Yin,Geotechnical principles and calculating[M] (Second Edition), Beijing: China Water Conservancy and Electricity Press, 2000, "In Chinese".

[7] Dingyi Xie, Journal of hydraulic, 1987（12）,17-32,"In Chinese".

[8] Gao Guorui, Loess microstructure classification and collapsibility, Chinese Science, 1980（12）, "In Chinese".

[9] Baoxiong Li, Tiande Miao,Chinese Journal of Rock Mechanics and Engineering, 2006, 25（5）,1003-1008 ,"In Chinese".