由于地下水位不是平面的，而是随着地形起伏的，所以地下水和地表水一样受到重力的影响。
Because the surface of the water table is not flat but instead rises and falls with topography, groundwater is affected by gravity in the same fashion as surface water.
西安地区由于过量开采地下水，引起地层压密效应，造成地面急剧下沉与重力值急剧增加。
In Xi 'an area, because the groundwater has excessively been exploited, the press-dense effect of strata appears so that the ground subsides and the gravity value increases sharply.
已有文献资料表明，该地区岩溶塌陷是地下水潜蚀、真空吸蚀、重力及荷载等多方面综合作用的结果。
Others research results showed that the mechanism of karst collapse in this area were latent corrosion of underground water, inhaling corrosion of vacuum, gravity load.
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