【摘要】 以某下方存在地铁隧道的基坑为背景,针对砂层较厚、地下水位较高而止水帷幕嵌入坑底深度受到地铁限制而造成坑底抗浮难以满足规范要求的情况,对局部坑底采用满堂加固止水的方法,在保证满足抗浮要求的情况下,通过调整跳挖间距,利用水泥土抗拉强度抵抗部分水头的原理进行跳挖法施工,待先开挖部分底板浇筑后再施工未开挖部分,从而达到止水效果。更多还原

【Abstract】 Taking a subway tunnel foundation pit under existing as the background,the thicker sand,high underground water level and water stopping curtain embedded bottom depth by subway constraints caused by the bottom floating resistance are difficult to meet the requirements of the standard for the local pit.The methods of full use of reinforced sealing are guaranteed to meet anti floating and requirements of the situation by adjusting the jump dig spacing.Using cement soil strength resistance partial head principle jump excavation, the first excavation bottom pouring after construction has not been excavated,so as to achieve the sealing effect.更多还原