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1)  middle expansive soils
中膨胀土
1.
Comparative tests on basic physical characteristics,compaction behavior,and California bearing ratio of typical middle expansive soils,fly ash-treated soils and Lime-treated soils have been carried out.
开展了典型中膨胀土、粉煤灰改性土与石灰改性土的基本物理特性、击实特性、强度特性比较试验。
2)  medium expansive soil
中等膨胀土
1.
Testing research into practicability of constructing embankment with medium expansive soil;
中等膨胀土填筑路堤的可行性试验研究
3)  weak-middle expansive soil
弱-中膨胀土
4)  expansion of expan-sive soil
膨胀土胀缩
5)  clay swelling
粘土膨胀
1.
The static capability of restraining clay swelling by NMPM was evaluated by the clay swelling measurement under high temperature and high pressure and the dynamic capability of restraining clay swelling by NMPM was studied by core flow tests.
说明在水驱油的过程中纳米聚硅材料可以在一定程度上抑制粘土膨胀。
6)  expansive soil
膨胀土
1.
Improvement of matter-element extension model and its application to classification of expansive soils;
物元可拓模型的改进及其在膨胀土分类中的应用
2.
Lateral swelling pressure of expansive soil acting on retaining wall due to inundation;
膨胀土挡墙侧向膨胀压力研究
3.
Analysis of vibration character of expansive soil embankments with different heights of He-Ning High-speed Railway;
合-宁客运专线膨胀土不同高度路堤动力特性分析
补充资料:膨胀土
      以粘土矿物为主要成分、对湿热环境变化敏感的高塑性粘土。膨胀土分布极广。多生成于盆地的边缘、谷地的高阶地。多属更新世。可有各种地质成因类型。主要特点是:①粒度组成中,粘粒含量大于30%。②粘土矿物以蒙脱石、伊利石等强亲水性矿物为主。③土体湿度增高时,体积膨胀,形成膨胀压力;土体干燥时,体积收缩,形成收缩裂缝。④膨胀、收缩随环境变化可往复发生,导致强度衰减。⑤属液限大于40%的高塑性粘土(见图)。⑥属固结性粘土。
  
  膨胀土的膨胀和收缩性常用膨胀压力、膨胀率、体缩和线缩率等指标表示。膨胀压力是土样在无侧向膨胀条件下湿化,控制膨胀变形为零时所需的压力。膨胀率则表示膨胀体积的百分率。体缩和线缩表示土样干燥前后,体变和线性变化的百分率。膨胀土易被误认为是工程地质性质较好的土,但实际上膨胀土易随湿热环境变化,产生体积变形而导致建筑物变形破坏。膨胀土由于干燥或其他原因常形成裂隙,裂隙面光滑,间而有次生土质充填,故而又称为裂隙土。常是控制边坡稳定的重要因素。
  

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