生石灰土挤密桩在京通快速路东段道路挡土墙基础处理中的设计与应用

Design and Application for llse the Quick Lime Soil Packing Pile Strengthen Soft Ground of Retaining Wall of the East Sectionof Jintong Expressway

京通快速路全长18.34km.西段长11.36km,东段长6.98km。东段道路挡土墙基础下地质条件较差,地基基本承载力低,满足不了挡土墙基底应力要求,因此对挡土墙基础采用了生石灰土挤密桩加固处理技术。此项技术通常在加固建筑软弱地基中使用。 本文对本工程采用生石灰土挤密桩技术处理道路挡土墙基础,从设计、施工及检验等几个主要方面做了较详细的论述。采用此项技术,可使原地基容许承载力由140～160KPa提高到180KPa以上,并满足设计要求。本文提出:生石灰土挤密桩方法处理道路挡土墙下的饱和粘性土基技术是可行的,而且施工简便,质量安全,经济效益高,缩短工期,为道路工程创造优质条件。此项技术的提出,也可为处理道路挡土墙软弱地基开辟一条新途径。

All the longth of Jingtong Expressway is as ling as 18.34km. The west section of it is 11.36km long and east is 6.98km long.Under the retaining wall of the east section the geology condition is poor and the basic bearing capacity of subsoil is low, which cann't meet the demands of the basis stresses, therefore, we used the quick lime soil paking piles technic to strengthen subsoil. This technic is often used to strengthen soft ground in construction engineering.A detail discussion that the quick lime soil packing technic is used to strengthen soft ground of retaining wall of highway has been given in this article,such as design, construction and examination etc. This technic makes raw subsoil's allowable bearing capacity improved from 140-160 kpa over which can meet the demands of design. It has been testified that the technic of quick lime soil packing piles is feasible to strengthen subsoil saturaled soil under retaining wall ground of highway. The construction is easy and safety, and its economic benefit is also high. This technic will make good conditions for highway engineering construction and open up a new way for strengthening soft ground of highway retaining wall.