Analytical solution of rock pressure for shallow-buried unsymmetrical-loading tunnels under earthquake loading
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摘要: 以擬靜力法為基礎,通過地震力偏角的旋轉,結合極限平衡條件,推導出地震作用下淺埋偏壓隧道圍巖壓力的解析解,并探討了其影響因素.研究發現地震側壓力系數受巖土體力學指標的影響明顯.在地震力作用下,豎向地震加速度系數使拱頂總垂直壓力值減少,多數情況下會降低地震側壓力系數;水平向地震加速度系數對總垂直地震壓力和地震側壓力系數的影響規律取決于水平地震力的方向.淺埋側的地震側壓力系數隨著地面傾角的增大而減小,而深埋側的地震側壓力系數隨著地面傾角的增大而增大.Abstract: Based on the pseudo-static method, an analytical solution of rock pressure for shallow-buried unsymme-trical loading tunnels under earthquake loading was derived by rotating the deflection angles of earthquake force and combining the limit equilibrium condition, with discussion on the influencing factors of rock pressure. It is found that the mechanical indexes of rock soil mass have an obvious influence on the lateral pressure coefficient. Under earthquake loading, the vertical earthquake acceleration coefficient always decreases the total vertical pressure on the vault and lowers the lateral pressure coefficient in most cases. The impact of horizontal earthquake acceleration coefficient on the total vertical pressure on the vault and the lateral pressure coefficient depends on the direction of horizontal earthquake force. The lateral pressure coefficient of the shallow-buried side always decreases with increasing ground inclination, but the lateral pressure coefficient of the deep-buried side increases.
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Key words:
- tunnels /
- earthquake effect /
- rock pressure /
- pseudo-static method /
- analytical solutions
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