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本文根据固结不排水和不固结不排水的三轴压缩试验成果,对目前改变土石混合物级配的两种习用的方法的正确性进行了评价。改变级配的目的是使混合物中的最大颗粒的粒径减小,以便用较小直径的试件进行室内试验。文中把未改变级配的(全级配)原土石混合物、试件直径×高=38.1×97.8cm的试验成果,与筛去粒径过大的部分并代之以重量相同粒径较小的材料和筛去(丢掉)粒径过大的部分两种材料、试件直径×高=15.2×35.7cm的试验成果,按总应力强度参数和有效应力强度参数进行了比较。关于用小直径试件的试验结果去推测全级配混合物的强度参数,通过比较,发现把粒径过大的部分筛去(丢掉)的办法是不能令人满意的;筛去粒径过大的部分并代之以重量相同粒径较小的材料的办法,对估计有效应力强度参数来说可以认为是合适的,但用来估计总应力强度参数也是不合适的。
Based on the triaxial compression test results of consolidated undrained and unconsolidated undrained, this paper evaluates the correctness of the two conventional methods to change the gradation of soil-rock mixture. The purpose of changing the gradation is to reduce the particle size of the largest particles in the mixture so that the test can be performed in a room with a smaller diameter test piece. The test results of unaltered gradation (full-graded) original soil-rock mixture and specimen diameter x height = 38.1 x 97.8 cm were compared with those where the particle size was oversized and replaced with the same weight as the smaller one. The test results of the material and the size of the screened (dropped) part of the two materials with an excessively large diameter and the diameter of the test piece x height = 15.2 x 35.7 cm were compared according to the total stress intensity parameter and the effective stress intensity parameter. Regarding the test results of small-diameter specimens, the strength parameters of the full-graded mixture were inferred. By comparison, it was found that the method of screening (discarding) the excessively large particle size was unsatisfactory; The use of parts that are of the same weight and smaller in size, may be considered appropriate for estimating effective stress intensity parameters, but it is not appropriate to estimate the total stress intensity parameters.