基础施工的环境影响监测限值分析

Impacting to the Existing Structures

基础施工中的桩基施工和基坑施工对周围土体环境将产生影响 ,一方面沉桩将挤密周围土体 ,造成地面隆起 ;另外一方面 ,基坑开挖将导致地面下陷。传统上 ,基础施工对环境影响的监测取值往往是根据经验来判定 ,但在某些情况下这种方法是不安全的 ,或者由于过分严格造成了经济上的不合理。本文将对如何选取限值从理论的角度加以探讨 ,由于打桩和基坑开挖对周围土体的影响相互抵消 ,所以 ,当计算基坑开挖所得的绝对值远远小于打桩影响值时 。

Pile driving and excavation will have impact on neighbor facilities. On the one hand, driving a pile will result in soil displacement. On the other hand, excavation will cause settle of soil surface. Monitoring the change of surrounding environment during the construction plays an important role. However, the criteria for monitoring still relys on previous experiences. This paper will dwell on how to choose the limit. Because the impact of pile construction and excavation is counteracting, it is not necessary to take into account the impact of excavation.