Device and method for testing initial freezing temperature of frozen soil in negative pressure environment

• Main Authors: CHEN JIANBING, LIU SHUYI, PENG HUI, JIN LONG, CUI FUQING, DONG YUANHONG, WANG SHUANGJIE
• Format: Patent
• Language: Chinese; English
• Published: 03.02.2023
• Subjects: BLASTING; HEATING; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIGHTING; MEASURING; MECHANICAL ENGINEERING; PHYSICS; PIPE-LINE SYSTEMS; PIPE-LINES; STORING OF DISTRIBUTING GASES OR LIQUIDS; TESTING; WEAPONS

The invention relates to a device and a method for testing the initial freezing temperature of frozen soil in a negative pressure environment. At present, the initial freezing temperature of frozen soil is measured without considering the influence of atmospheric pressure, and the initial freezing temperature of frozen soil in a negative pressure environment cannot be measured. The device comprises a compressed air tank, an electromagnetic control valve, a jet type vacuum device, a pressure sensor, a temperature sensor and a sample copper cup, the compressed air tank is connected into the jet-type vacuum device through an airflow pipeline, the jet-type vacuum device is connected into the sample copper cup through an airflow pipeline, and the temperature sensor is arranged in a soil sample in the sample copper cup; a pressure sensor is arranged on the airflow pipeline between the jet-type vacuum device and the sample copper cup, and an electromagnetic control valve is arranged on the airflow pipeline between t