人工开挖边坡的长期稳定性分析与土的强度参数确定.pdf

24 5 Vol.24 No.5 2002 9 Chinese Journal of Geotechnical Engineering Sept., 2002 The long term stability of cut slope and determination of effective strength index of soils 1 1 2 3 廖红建, 韩 波, 殷建华, 赤石胜 ( 1. , 710049; 2. , ; 3. , ) :,, , , , , , , :; ;; :TU 413.62 :A : 1000- 4548(2002) 05- 0560- 05 : ( 1962- ) , , , , , , , , , 1 1 2 3 LIAO Hong-jian ,HAN o ,YIN Jian-hua ,AKAISHI Masaru ( 1. Department of Civil Engineering,Xi. an Jiaotong University, Xi. an 710049, China; 2. The Hong Kong Polytechnic University, Hong Kong, China;3. Tokai Uni- versity, Kanagawa, Japan) Abstract: This paper is concerned with the long term stability problem of cut slope. To investigate the decrease of strength and the change of strength index of submerged soils, a series of triaxial shear testswere carried out on both submerged and non-submerged cohesive soil specimens. Some laboratory simulation tests were also conducted to illustrate the change of stress path of soil in cut slope induced by rainfall and variation of groundw ater level. From above tests, we can obtain that the effective cohesion parameter is almost equal to zero and the angle of shearing resis- tance is near to that of normally consolidated soils under submerging and the long-term geological weathering. The validity of the method of strength indexes determination was confirmed by a practicalfailure case with total stress method and effective stressmethod . ased on the experi- mental results, a simplified, practical and economic method of the determination of strength indexes is proposed. Key word: stability; cohesive soil; groundwater; triaxial shear test ; » 1 X