河北平原地裂缝及其危害

Rift in the Hebei Plain and its harm

河北平原地裂缝的广泛出现给地面建筑、水利设施和农田道路造成一定程度的危害。绝大部分地裂缝的空间分布、产状形态和位移动向具方向性、成带性、区域性和系统性等规律,在时间进程上具明显的周期性,河北平原的地裂活动从公元95年至今1900年间有记录者至少16次。分析认为,河北平原存在几种类型地裂缝,数量最多者是隐伏于地下的土层构造节理在地表水下渗、浸润、冲刷这一决定性的诱发因素附加作用下,传到地表显现成缝;次为断层活动在地表土层中发生的地裂缝。

The wide-ranging emergence of rift in the Hebei plain brings about certain extent of harm to the buildings on the ground, water conservancy installations, farmland and roads. Most of the rifts demonstrate the rules on direction, belt, regionality and system in the distribution of space, production shape and morphology, and trends of displacement, and it shows obvious periodicity in process of time. The cracking activity recorded in the Hebei plain is numbered at not less than 16 times during 1900 years from A. D. 95 up to now. Through analysis it is thought that there are several types of rifts in the Hebei plain,most of which is the crevice showed in the surface,produced by additional effects of the determining inducing factors such as infiltration of surface water,wetting and scouring on the tectonics and joint of soil horizon hidden under the ground; another type is the one occurred in the horizon of surface soil during the activity of fault.