Changjiang River Scientific Research Institute, Changjiang Water Resource Commission

Changjing River Scientific Research Institute

Xiuli Ding

Shan Li

Jun He

Shuling Huang

Bin Wang

Ping Fu

Xinhui Zhang

Dengxue Liu

Sheng Luo

Xiaoyu Han

Chunhua Zhou

Yuankun Liu

Heng Zhang

Gang Han

Yuting Zhang

Liming Zhou

Kai Ai

Peiyang Yu

Zhihong Dong

An in-situ stress measurement device for ultra-deep non-vertical drilling adopts a technical route of single channel and bidirectional rolling of in-hole equipment, and its related functions are mainly realized by a bidirectional rolling device and a split-type axial-force-free circuit switching valve. The bidirectional rolling device can drive the in-hole equipment to move freely in a circumferential direction and back and forth, which changes sliding friction between the in-hole equipment and a hole wall into rolling friction during an in-situ stress measurement of non-vertical drilling. The split-type axial-force-free circuit switching valve provides a technical solution for a single-pipe test in the non-vertical drilling. The device greatly reduces wear of the in-hole equipment and the hole wall when the in-hole equipment is installed and withdrawn, can effectively protect markings of an impression measurement, and is suitable for high-efficiency in-situ stress measurement by a hydraulic fracturing method in the non-vertical ultra-deep drilling.

In-situ stress measurement device and method for ultra-deep non-vertical drilling

The invention discloses an experimental system of surrounding rock and lining structure under unequal surrounding pressure and water pressure, comprising: reaction wall, lining structure, external water pressure loading mechanism, internal water pressure loading mechanism, prestress-loading mechanism, surrounding rock layer and monitoring device. The Experimental System can simulate the stress characteristics and related deformation characteristics of the surrounding rock of the tunnel and the lining structure of the water conveyance tunnel under complex internal and external loads in the actual environment, and can help to analyze and study the broken appearance of the lining structure and the crack distribution after cracking.

Experimental system of surrounding rock and lining structure under unequal surrounding pressure and water pressure

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Wuhan, China

Xiuli Ding