1 The arrangement of boreholes in the general layout are according to design requirement. They could be properly adjusted depending on actual situations.2 Detecting the structure, cause type, range of distribution and physical and mechanical properties of stratums of the proposed factory area. If the boreholes meet bedrock in its setting depth, detecting the structure of the bedrock, rock-face variance regular, rock-face contour line, extent of weathering of the bedrock and depth of weathering layer. Having a evaluation on the stability of the site foundation and bearing capacity of all the layers.3 Detecting whether there are harmful geological situations. If there are, the concrete position, depth, range and extent of harm on buildings of them should be detected; suggestions on preventive measures and necessary materials should be afforded. Such as: whether there are solution caves, earth caves or not; if there are, giving the size, properties, top-slab depth and filled materials of these caves.
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