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一、工区地层情况工区地形属冲积绿洲平原，局部洼沟最大高差2～4m，稍加修整，汽车可以通行。钻孔穿过的地层，有冲积物，洪积物和风积物构成的河漫滩，其间以砂砾石层、砾石层为主，砂土层仅在部分Ⅰ级阶地和Ⅱ级阶地出现100～500mm；砾石有花岗岩、闪长岩、石英岩、花岗片麻岩和脉石英等；砾石度（从浅井中得知）大于100mm的占63％，大于300mm的占23％；从河漫滩观察，磨盘大的砾石，亦是星罗棋布，由此给施工带来困难，打半节孔的机会很多。
First, the work area stratigraphic situation The work area terrain is alluvial oasis plain, the maximum partial elevation depression 2 ~ 4m, a little dressing, the car can pass. The strata through which boreholes are drilled are alluvial sediments, alluvial and volcanic floodplains formed by aeolian deposits. During this period, gravel layers and gravel layers are the main layers. The sand layers only show 100-500 mm in part Ⅰ and Ⅱ terraces. Gravel has granite, diorite, quartzite, granitic gneiss and vein quartz; gravel (known from shallow wells) is greater than 100mm accounted for 63%, more than 300mm accounted for 23%; from the floodplain observation, large disc Gravel, is also dotted, which brings difficulties to the construction, a lot of opportunities to play half hole.