关键词: 风积砂地层, 井壁结构, 竖直附加力, 物理试验, 数值计算

Abstract: Through physical experiment and numerical calculation, the vertical shear test between saturated sand and shaft concrete interface was preliminarily studied, and some interface shear strength parameters were obtained. The variation of vertical additional force on shaft lining in thick aeolian sand strata was further studied through numerical calculation. Research results have shown that 1) The vertical additional force presents nonlinear growth rule as the depth in aeolian sand strata increases, and the maximum vertical additional force appears near the interface between aeolian sand and bedrock; and 2) After entering the bedrock, vertical additional force rapidly decreases because of bedrock force-sharing effect. In more than 100 meters depth of aeolian sand, as water level of aeolian sand aquifer declines (such as decline more than 20 meters), traditional double layer shaft lining can be ruptured near the interface between aeolian sand and bedrock under the action of vertical additional force. Therefore, the compressible shaft lining structure should be adopted to limit the increase of vertical additional force in thick aeolian sand strata.

Key words: aeolian sand strata, shaft structure, vertical additional force, physical test, numerical calculation