杨玉林

摘要:新建邯黄铁路沧州段穿过近海冲积平原，地质属含水超饱和的典型的粉质粘土和淤泥质黏土。强排水复合型动力固结法，是近年来在我国吹填海域正在小面积使用的一种新软基加固工法，一般用于加固冲积地质地层，即由粉细砂层或由粉细砂层和粘土层相间构成的软土地基。其处理方式是：采用网络状轻型井点强排水法和低能量动力固结法两种加固方法有机匹配和揉合的复合型工法，该法要对被加固土体骨架有效施加予力技术，按照予力作用原理给其软基土体骨架施加予力作用，即反复施加动应力和静应力于土体骨架上，加速土体的排水固结，从而促成饱和软粘土产生预变形预沉降，将使用荷载全部加上去后可能产生的大部分总沉降量消除在加固处理过程中，使软弱地基土经处理后能更好地满足工程使用阶段的承载变形要求。

关键词软土地基；高真空强排水；复合型动力固结；铁路路基软基

Abstract: The new Han Huang railway Cangzhou paragraph cross inshore alluvial plain, geology is typical of water saturated silty clay and silty clay. Forced drainage complex dynamic consolidation method, is in our country in recent years a reclamation area is small area using a new soft foundation strengthening method, generally used for reinforcement of alluvial geological formation, namely the silty sand fine sand layer and clay layer or by the alternate form of soft soil foundation. The processing method is : the network light well point drainage method in high and low energy dynamic consolidation method in two kinds of strengthening methods of organic matching and a hybrid method, the method of reinforcing soil skeleton to be applied effectively Given-Force technology according to the principle, to force to the soft foundation soil framework applied to the force, i.e. repeated application of dynamic stress and static stress on the soil skeleton, accelerated soil drainage consolidation of saturated soft clay, thus contributing to the generation of pre deformation pre settlement, it will use all the load added may be produced after the majority of the total settlement of elimination in the reinforcement process, so that the weak foundation soil after treatment can meet better project using the phase of the bearing capacity and deformation requirements.

Key words: soft soil; high vacuum drainage dynamic consolidation strength; composite; soft roadbed of Railway

中图分类号：U416

1、工程概况

新建邯郸（邢台）至黄骅港铁路工程第Ⅳ标段，线路位于河北省沧州市境内，线路起自赵庄跨京沪高速公路特大桥桥尾DK254+973，止于港区矿石码头装车站DK386+650，标段全长130.05km，设11座车站，路基总长105km，而需要加固处理的软弱地基共长87km。沿线处于平原地带，地下水类型主要为空隙潜水，赋存于第四系松散堆积物中，含水层为砂类土、粉土和粉质黏土层。地下水主要接受大气降水及附近地表水入渗补给，盐山以西水位埋深一般1.0～2.0m，局部地段大于3m；……