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风积沙地层是我国西部地区常见的地质情况,具有结构松散、颗粒间黏聚力极低、抗剪强度低等特点,风积沙地层中开挖隧道时自然也就面临围岩稳定性的问题,旋喷桩在一些工程案例中被用于解决该问题。通过离散元软件来模拟风积沙地层,对水平旋喷桩和竖直旋喷桩两种旋喷桩方法在风积沙隧道中的加固作用进行分析,从洞周变形、衬砌内力和应力分析等探讨两种方法的不同加固机理、施工质量控制关键点、优劣水平等问题,可为旋喷桩的利用提供理论参考。
Aeolian sand stratum is a common geological condition in the western part of our country. It has the characteristics of loose structure, very low cohesion between particles, low shear strength and so on. The stability of surrounding rock is naturally encountered in tunnel excavation in the aeolian sand stratum Problem, jet grouting pile in some engineering cases are used to solve the problem. Through the discrete element software to simulate the aeolian sand stratum, the effect of the two types of jet grouting piles by horizontal jet grouting pile and vertical jet grouting pile in the aeolian sand tunnel is analyzed. From the deformation of the perimeter of the tunnel, the lining internal force and the stress analysis Discuss the different reinforcement mechanism of the two methods, the key points of construction quality control, the quality level and other issues, which can provide theoretical reference for the utilization of jet grouting pile.