• 土木工程 •

### 高地应力下砂岩力学参数和波速变化规律试验研究

1. 1. 华侨大学土木工程学院，福建 厦门 361021
2. 福建省隧道与城市地下空间工程技术研究中心, 福建 厦门 361021
• 收稿日期:2019-10-17 出版日期:2020-06-20 发布日期:2020-06-16
• 通讯作者: 陈士海 E-mail:836408502@qq.com;cshblast@163.com
• 作者简介:宫嘉辰(1995—)，男，山东烟台人，硕士研究生，主要研究方向为岩土工程方向研究.E-mail: 836408502@qq.com
• 基金资助:
国家自然科学基金资助项目(51974136);华侨大学研究生科研创新基金资助项目(17014086007)

### Experimental study on mechanical parameters and wave velocity variation of sandstone under high ground stress

Jiachen GONG1(),Shihai CHEN1,2,*()

1. 1. College of Civil Engineering, Huaqiao University, Xiamen 361021, Fujian, China
2. Fujian Research Center for Tunneling and Urban Underground Space Engineering, Xiamen 361021, Fujian, China
• Contact: Shihai CHEN E-mail:836408502@qq.com;cshblast@163.com
• Supported by:
国家自然科学基金资助项目(51974136);华侨大学研究生科研创新基金资助项目(17014086007)

Abstract:

A large number of studies showed that high ground stress had a certain influence on the wave velocity of deep buried rock, based on the wave equation, a mathematical model of the relationship between longitudinal wave velocity of sandstone and hydrostatic confining pressure was proposed. Based on the conventional triaxial test of rock, the static elastic modulus, static Poisson's ratio and longitudinal wave velocity of sandstone under different hydrostatic confining pressures were obtained, and the fitting curves and fitting formulas of static elastic modulus-hydrostatic confining pressure and static Poisson's ratio-hydrostatic confining pressure were obtained respectively. The test results showed that the static elastic modulus and static Poisson's ratio of sandstone increased with the increase of hydrostatic pressure, and the rate of increase of static elastic modulus decreased slowly. Based on the wave equation, the mathematical model of the longitudinal wave velocity-hydrostatic confining pressure was obtained, the longitudinal wave velocity calculated by the mathematical model showed that the longitudinal wave velocity of the sandstone increased with the increase of the hydrostatic pressure, and the increasing rate gradually became slower. The calculated longitudinal wave velocity was compared with the measured, the error range was 7.0%-8.3%. Therefore, the mathematical model of sandstone longitudinal wave velocity-hydrostatic confining pressure based on wave equation was reliable and accurate, it was of guiding significance to analyze and judge the physical and mechanical parameters of rock under high ground stress and the variation law of wave velocity.

• TD23
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