摘要
由于上海地区有较高的承压水位,深基坑施工时,为了基坑的稳定,有时需要大深度的降水来保证。由于基坑内外地下承压水连续相通,降水影响范围大,引起坑外地面产生沉降,对周围建筑物和管线造成不利影响。针对浅层承压含水层基坑降水,以粘弹性理论和随机介质理论为基础,推导了一种新的基坑降水引起地面沉降的计算方法。该方法通过Merchant流变模型模拟抽水条件下土的应力-应变关系来反映抽水引起含水层变形的时间效应,以随机介质理论反映地面沉降的空间分布规律,能够较好地预测基坑降水引起的地面沉降。最后通过计算实例对该方法进行了验证。
Dewatering in deep foundation pit is sometimes necessary for the stability of the deep pit. The surface subsidence induced by draining out the water from confined aquifer, is detrimental to buildings and pipelines nearby. Based on visco-elasticity theory and stochastic medium theory, a new calculation method was put forward in this paper, in which the time effect of the deformation of aquifer caused by draining out the water and the space characteristic of the surface subsidence were taken into account. In order to predict the surface subsidence caused by dewatering in deep pit correctly, the stress-strain relationships of soil was simulated by Merchant model. Finally, the numerical results of an example were analyzed to verify the use of the proposed method.
出处
《地下空间与工程学报》
CSCD
2008年第1期181-184,共4页
Chinese Journal of Underground Space and Engineering
