Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ASTM D2845-05
• Năm ban hành / Publication date: 2005
• Tình trạng / Status: W - Hết hiệu lực
• Tên tiếng Anh / Title in English: Standard Test Method for Laboratory Determination of Pulse Velocities and Ultrasonic Elastic Constants of Rock
• Chỉ số phân loại Quốc tế (ICS) / By field: 93.020 - Công việc làm đất. Bào đất. Xây dựng móng. Công trình ngầm
• Số trang / Page: 7
• Phạm vi áp dụng / Scope of standard: 1.1 This test method describes equipment and procedures for laboratory measurements of the pulse velocities of compression waves and shear waves in rock (1)² and the determination of ultrasonic elastic constants (Note 0) of an isotropic rock or one exhibiting slight anisotropy. Note 1 - The elastic constants determined by this test method are termed ultrasonic since the pulse frequencies used are above the audible range. The terms sonic and dynamic are sometimes applied to these constants but do not describe them precisely (2). It is possible that the ultrasonic elastic constants may differ from those determined by other dynamic methods.1.2 This test method is valid for wave velocity measurements in both anisotropic and isotropic rocks although the velocities obtained in grossly anisotropic rocks may be influenced by such factors as direction, travel distance, and diameter of transducers.1.3 The ultrasonic elastic constants are calculated from the measured wave velocities and the bulk density. The limiting degree of anisotropy for which calculations of elastic constants are allowed and procedures for determining the degree of anisotropy are specified.1.4 The values stated in inch-pounds are to be regarded as the standard. The SI values given in parenthesis are provided for information purposes only.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.