三轴剪切试验中几个基本问题的研究  

Study on Basic Problems of Traxial Shear Tests

作　　者：王志玲 方涤华[2] 

机构地区：[1]黄委会水科院,郑州450003 [2]河海大学,南京210024

出　　处：《人民黄河》1992年第9期38-41,共4页Yellow River

摘　　要：对小浪底击实粘上固结后B值的变化及其对强度特性影响的试验研究表明,已抽气饱和的试样,固结后再测定B值,B<1将引起土体抗剪强度增加,但不符合有效应力原理。试验中还发现,目前使用的三轴仪,底座及试样帽为平直侧面型,不利于止水;按常规试验步骤测出的B值及固结排水量不能正确反映试样的饱和情况和排水量。文中提出在底座和试样帽上各开两道弧形浅槽,涂上硅脂以解决漏水问题;并建议用10～20kPa的周围压力排水,以排水后测得的B_0反映试样的饱和度为宜。It is shown by the study on testing the changes of B value after consolidating the tamped clay and effects to the characteristic of strength of Xiaolangdi Project that the B value of extracted and saturated test sample is measured after consolidation, the shear strength of the earth mass would be increased if B<1. This does not tally with the theory of effective stress. It has also been found by the test that the present used traxial equipment, base and cap of the sample are in smooth flank shape which is not good for sealing: and the B value and the amount of drainage from consolidation observed by conventional testing steps can not reflect the satuation and drainage of test samples properly. The paper has suggested to make two shallow arc grooves on the base and cap and paint with silicone resin for solving the problem of leakage: and also suggested to dewater by using 10～20kpa ambient pressure and take the degree of saturation of B_0 which observed after dewatering and can reflect test sample as appropriate.

关 键 词：三轴剪切试验 固结 排水量 饱和土 

分 类 号：TU411.7[建筑科学—岩土工程]