粉煤灰碎石混凝土灌注桩法加固软弱地基效果的分析与检验

对由深厚软弱土层组成的地基,采用粉煤灰碎石混凝土灌注桩法予以加固处理时,其施工机具相对简单,工期短,节约“三材”,投资省,具有显著的经济效益。由粉煤灰碎石混凝土灌注桩和深厚软弱土层共同构成的复合地基的工程特性,介于一般碎石桩复合地基与混凝土桩桩基之间,其基本特征是:承载力的提高,主要是置于深厚软弱土层中的粉煤灰碎石混凝土灌注桩的排水和垂直加筋作用的结果;其承载机理,部分具有一般碎石桩复合地基的特征;在结构物荷载作用下,其桩、土荷载分担特征,比较接近于普通混凝土桩桩基。

Effect of powdered coal ash-crushed stone Concrecte grouting pile method for the reinforcement of weak foundation

For the reinforcement of a foundation composed of deep, thick and weak soil layere, the use of powdered coal ashcrushed stone concrete grouting pile method is characterized by relatively simple operating machines, short time limit, materials econominzing, money saving, and remarkable economic efficoiency. The engineering property of the composite foundation formed from the combination of the powdered coal ash-crushed stone concrete grouting pile and the deep, thick and weak soil layers lies between cmmon crushed stone composite foundation and concrete pile foundation, which is characterized mainly by the heightening of bearing capacity, as aresult mainly from the drainage and vertical reinforcement action of the powdered coal ash-crushed stone concrete grouting pile put into the deep, thick and weak soil layers. Its bearing mehcanism is partly characterized by common crushed stone pile composite foundation; while under the loading of a structure, it is characterized by shared bearing by pile and soil, which is more close to the common concrete pile foundation.