本文件规定了两种实验室试验方法，用于使用剪切箱或环形剪切装置测定固结排水条件下土壤的有效剪切强度。 本文件适用于岩土工程勘察范围内直剪土壤有效抗剪强度参数的实验室测定。 本文件中包含的试验适用于未扰动、重塑、重新压实或重塑土壤。该程序描述了在单一垂直（法向）应力下测定试样抗剪强度的要求。 通常，从一种土壤中制备三个或三个以上的类似试样，用于在三个或三个以上不同的垂直压力下进行剪切，以便根据附录B确定抗剪强度参数。 本文件的程序中不包括制备和测试试样的特殊程序，如分阶段加载和预剪切，或土壤和其他材料之间的界面试验。 注:根据EN 1997，本文件满足岩土工程勘察和试验用直剪土壤排水抗剪强度测定的要求- 1和EN 1997-2。

This document specifies two laboratory test methods for the determination of the effective shear strength of soils under consolidated drained conditions using either a shearbox or a ring shear device. This document is applicable to the laboratory determination of effective shear strength parameters for soils in direct shear within the scope of geotechnical investigations. The tests included in this document are for undisturbed, remoulded, re-compacted or reconstituted soils. The procedure describes the requirements of a determination of the shear resistance of a specimen under a single vertical (normal) stress. Generally three or more similar specimens from one soil are prepared for shearing under three or more different vertical pressures to allow the shear strength parameters to be determined in accordance with Annex B. Special procedures for preparation and testing the specimen, such as staged loading and pre-shearing or for interface tests between soils and other materials, are not covered in the procedure of this document. NOTE This document fulfils the requirements of the determination of the drained shear strength of soils in direct shear for geotechnical investigation and testing in accordance with EN 1997-1 and EN 1997-2.