吐哈油田鄯善矿区盐渍土地基勘察

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通过多年对吐哈油田鄯善矿区岩土工程的勘察,查明了矿区的地质构造和沉积特点,以及地形地貌、水文地质、地层条件和气象条件。同时对盐渍土的成因、分布和分类做出了比较详细的介绍。重点对盐渍土的工程特点进行了评价。矿区内的盐渍土、强盐渍土区内具有中~强腐蚀性,在中~弱盐渍土区具有弱腐蚀性。化学分析证明,地基土中硫酸钠平均含量为0.2%,极个别的达到1.02%,可不考虑盐胀性。在溶陷性试验中,矿区共对11个测点进行了载荷试验。试验表明:在强盐渍土区深度2.5m以下和中~弱盐渍土区深度1.5m以下的土层不具有溶陷性,对于中~弱盐渍土区深度0.0~1.5m之间的地层,由于骨架颗粒含量高且含盐低也可不考虑溶陷性,对于强盐渍土区深度0.0~2.5m之间的地层,若基础埋深在1.0~7.5m,可按Ⅰ级溶陷性对待,若基石出理深小于1.0m,应按Ⅱ级溶陷性对待。整个矿区地基承载力均为250kPa以上,在浸水条件上,对于中~弱盐渍土区,其地基承载力也在200kPa以上。对于盐渍土地基可采用局部换土法和浸水预溶性进行处理。 Through years of investigations into the geotechnical engineering of the Shanshan Orefield in the Tuha Oilfield, the geological structure and sedimentary characteristics of the mining area have been ascertained, as well as the topography, hydrogeology, formation conditions and meteorological conditions. At the same time, it gives a detailed introduction to the causes, distribution and classification of saline soil. Focus on the evaluation of the engineering characteristics of saline soil. The salinity soil and strong saline soil areas in the mining area are medium to strong corrosive, and have weak corrosiveness in the medium to weak saline soil areas. Chemical analysis showed that the average content of sodium sulfate in the foundation soil was 0.2%, and extremely few reached 1.02%, and the salt expansion could be ignored. In the subsidence test, a total of 11 test points were loaded in the mine. The test shows that the soil layer below the depth of 2.5m in the strong saline soil area and below 1.5m depth in the medium to weak saline soil area does not have the ability to be subsidence, and the depth is 0.0 to 1 for the medium to weak saline soil areas. In the stratum between .5m, due to high content of skeleton particles and low salt content, it is also possible not to consider the subsidence. For the strata with a depth of 0.0-2.5m in strong saline soil zone, if the foundation buried depth is 1.0 ~ 7.5m, which can be treated as Class I. If the depth of the base stone is less than 1.0m, it should be treated as Class II. The foundation bearing capacity of the entire mining area is more than 250 kPa. In the flooding conditions, the foundation bearing capacity of the medium to weak saline soil area is also above 200 kPa. For saline soils, local soil replacement and pre-soaking can be used for treatment.
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