基岩冻结新型单层井壁施工技术与监测分析

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摘要以鄂尔多斯市呼吉尔特矿区葫芦素副立井为工程实例，详细阐述国内首个基岩冻结新型单层井壁的施工工艺和监测方法，对井壁施工过程中的技术难点进行分析，给出井壁混凝土的质量控制指标。现场实测表明：(1) 凿井期新型单层井壁的钢筋应力和混凝土应变同时受基岩冻结压力与井壁温度的影响；(2) 井壁钢筋应力、混凝土应变的变化过程可分为OA，AB，BC，CD共4个阶段；(3) 凿井期葫芦素副立井竖向钢筋拉、压应力极值分别为35.5～70.8和－7.0～－45.0 MPa，环向钢筋则始终处于受压状态，其压应力极值为－41.7～－101.0 MPa；(4) 凿井期混凝土竖向、环向压应变极值分别为－190.5～－458.0和－590.4～－799.1 με，环向压应变极值为竖向的1.3～4.2倍；(5) 建议将竖筋悬吊的井壁高度取为12 m；(6) 葫芦素副立井井壁配筋于凿井期具有足够的安全储备，混凝土压应变处于安全范围。

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关键词 ：采矿工程, 深厚含水基岩, 冻结法凿井, 新型单层井壁, 施工技术, 光纤光栅, 现场实测

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

收稿日期: 2011-08-19

引用本文:

张驰1，杨维好1，齐家根2，李海鹏1，张涛3. 基岩冻结新型单层井壁施工技术与监测分析[J]. 岩石力学与工程学报, 2012, 31(2): 337-346.
ZHANG Chi1，YANG Weihao1，QI Jiagen2，LI Haipeng1，ZHANG Tao3. CONSTRUCTION TECHNOLOGY AND MONITORING ANALYSIS OF A NEW SINGLE-LAYER SHAFT LINING IN DEEP AQUEOUS BEDROCK DURING FREEZING SINKING. , 2012, 31(2): 337-346.

链接本文:

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

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