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施工岩层及特征施工地区的地层属于河湖相沉积的灰绿色粗、细粒砂岩,泥岩,砂砾岩和角砾岩等.钻孔倾角75～85°.施工过程中,存在严重的“玉米粒”式坍塌并伴有渗漏.裂隙发育,松散多孔,机械震动易破碎,且胶结松散,水敏性强,膨胀性大.有的用手可搓碎.裂隙面上发育有方解石,面与面之间呈淡黄和褐红色,水锈明显,说明岩层可能存在于地下水活动区.地层在施工中易水化、溶蚀、剥落和破碎坍塌,又因常含泥岩、页岩和粘土等,而使施工更加困难.粘土矿物多是微晶高岭石和高岭石,其含量越高,孔内情况也越加复杂.
Construction strata and characteristics The strata of the construction area belong to the gray-green coarse-grained, fine-grained sandstone, mudstone, glutenite and breccia deposited in rivers and lakes, etc. The dip angle of drilling is between 75 and 85. During the construction, there are serious "corn grain Crack development, loose porous, mechanical vibration easily broken, and the loose cement, water sensitivity, expansibility, and some can be grasped by hand. Crack surface development of calcite, surface and Pale yellow and maroon between the surface, water rust is obvious, indicating that the rock layer may exist in the groundwater activity zone.The formation of easy hydration, erosion, spalling and crushing collapsed during construction, due to often containing mudstone, shale and clay, etc., Leaving the construction more difficult.Clay minerals are mostly microcrystalline kaolinite and kaolinite, the higher the content, the hole is also more complex.