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黄土边坡在开挖卸载过程中的稳定性分析及其防护在边坡工程中占有重要地位。采用西南交通大学土工离心机进行了1组非支护边坡和2组土钉支护边坡的离心模型试验,研究了开挖卸载过程中黄土边坡的变形特性、稳定性变化规律及土钉的加固效应。离心模型试验研究表明,土钉能够显著提高黄土边坡的稳定性。土钉支护的边坡土体,因土钉的锚固效应,边坡的变形范围更大,但变形量较小,最大变形量并不在坡面,而是发生在坡面下的锚固区域内,非支护黄土边坡的潜在滑移面产生于距坡顶约40cm处,土钉支护后,黄土边坡基本不会发生破坏。对于抵抗边坡发生变形而言,不等长土钉支护的效果要优于等长土钉支护,研究成果为黄土边坡的开挖与防护提供了参考。
Stability analysis and protection of loess slope during excavation and unloading process occupy an important position in slope engineering. Centrifuge model tests of one group of unsupported slopes and two groups of soil nailing supported slopes are carried out with the geocentrifuge of Southwest Jiaotong University. The deformation characteristics and stability of loess slopes during excavation and unloading are studied. Nail reinforcement effect. Centrifuge model tests show that soil nailing can significantly improve the stability of loess slopes. Due to the anchoring effect of soil nails, the deformation range of slope is larger, but the deformation amount is smaller, the maximum deformation is not on the slope, but occurs in the anchorage area under the slope , The potential slip surface of the non-supported loess slope is about 40cm away from the top of the slope. After the soil nailing is supported, the loess slope basically will not be damaged. In order to resist the deformation of slope, unequal length of soil nailing support is better than equal length of soil nailing support. The research results provide a reference for excavation and protection of loess slope.