渗流力对地下室结构裂缝影响研究

Research on seepage force on the impact of underground structure crack

地下室结构对防渗性有很高要求,防渗等级与裂缝宽度直接对应,外界作用力的大小决定裂缝的宽度大小,但外界水土侧向作用力的计算一般考虑土压力和静水压力作用,没有考虑渗流的作用,会导致计算值和实测值相差较大。在渗流力作用下,渗流力使土的有效应力大小发生改变,从而影响土的抗剪强度,使地基下沉,产生地下室结构裂缝。通过计算阻碍力和渗透力的相互作用,建立求解未知数方程,得到计算外界作用力的新方法,根据多种地质条件,使地下室裂缝的计算更符合实际情况。

Basement has high request for impermeability,anti-seepage grade corresponds to crack width directly,and the magnitude of external force decides crack width dimension,but earth pressure and water pressure are usually considered for calculating external force. Nonconsideration of groundwater seepage is one of the main reasons why measured values are generally very different from those calculated values. Under the action of seepage,seepage force changes the soil effective stress and affects the soil shear strength,and makes foundation soils sinkaqe and crack in underground structure. Through calculating interaction of the hindering force and seepage force,by setting up differential coefficient equations and constructing,a set of entire new expressions for calculating external force was presented with consideration of groundwater seepage. Corresponding to different foundation conditions,this new method for calculating structure crack is more practical and accurate.