高速公路软基的沉降观测分析

申苏浙皖高速公路(浙江段)湖州—长兴姚家桥段软基处理方法不同。通过选取三个典型断面:K0+830(塑料排水板),K0+850(粉喷桩)和K0+940(粉喷桩),埋设必要的观测仪器,对地表、深层和分层沉降进行了现场观测得出,塑料排水板加固比粉喷桩沉降约大两倍;地表附近土层压缩量远大于深远土层压缩量;在近地20m的土层内,沉降量占总沉降量的90%以上。

Observation and Analysis of Soft Ground Settlement on Expressways

Different methods are adopted for soft ground treatment of the section from Huzhou to Yaojiaqiao at Changxing in Zhejiang Section of the expressway (Shanghai~Jiangsu~Zhejiang~Anhui), with three typical sections selected: K0+830 (plastic drainage board), K0+850(dry jet mixing piles) and K0+940(dry jet mixing piles). By burying essential observation instruments in these three across sections, settlements of surface, shallow layer and deep layer are observed during the filling on the foundation, showing the following results. Settlement by strengthening with plastic drainage board is about twice greater than that with dry jet mixing piles; compression of surface layer is much greater than that of deep layer; in the layer 20 m from the surface, settlement occurs over 90% of the total.