基岩冻结新型单层井壁施工技术与监测分析

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Abstract Based on the project example of Hulusu auxiliary shaft of Hujierte coal mine in Erdos，the construction technology and monitoring method of the first new single-layer shaft lining in bedrock during freezing sinking in China are described. The main technical difficulties in shaft lining construction process are analyzed in detail and the concrete quality control standards of shaft lining are given. The field monitoring results show that：(1) The steel stress and concrete strain of new single-layer shaft lining are the combined action results of bedrock freezing pressure and shaft lining temperature during shaft sinking. (2) The change process of steel stress and concrete strain can be divided into 4 periods，i.e. OA，AB，BC and CD period. (3) During shaft sinking，the maximum tensile stress of vertical steels is 35.5–70.8 MPa and the maximum compressive stress of vertical steels is －7.0–－45.0 MPa；and the circumferential steels keep in compression condition all along and the maximum compressive stress is －41.7–－101.0 MPa. (4) The maximum vertical compressive strain of concrete is －190.5–－458.0 με and the maximum circumferential compressive strain is －590.4–－799.1 με. The maximum circumferential compressive strain of concrete is 1.3–4.2 times of the vertical direction. (5) It is recommended that the vertical steels should be designed to withstand the load of 12 m height of the new single-layer shaft lining. (6) In conclusion，the new single-layer shaft lining of Hulusu auxiliary shaft is safe during shaft freezing sinking.

Key words： mining engineering deep aqueous bedrock shaft freezing sinking new single-layer shaft lining construction technology fiber bragg grating in-situ measurement

Received: 19 August 2011

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http://www.rockmech.org/EN/Y2012/V31/I2/337

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