Scholarlink

<p>With increasing urbanization and limited ground space, deep excavations are crucial for constructing underground structures. Diaphragm walls are widely used to resist lateral earth pressures and maintain excavation stability. To enhance their performance, helical anchors are commonly installed to control lateral displacement and settlement during excavation and service life. This study presents a series of scaled model experiments investigating the behavior of unanchored, single-row anchored, and double-row anchored diaphragm walls subjected to surcharge loading applied at different normalized horizontal offsets from the excavation face (<i>x</i>/<i>H</i> = 0.1, 0.2, 0.3, and 0.4), where <i>x</i>/<i>H</i> represents the ratio of the horizontal distance between the surcharge location and the diaphragm wall to the wall height. The tests also investigate the effects of anchor inclinations ranging from 5° to 20° with respect to the horizontal, as well as two anchor lengths (0.6<i>H</i> and 0.9<i>H</i>). Results demonstrate that a double-row anchored wall significantly reduces lateral pressure, wall deflection, and footing settlement compared to a single-row and unanchored wall. An anchor inclination of 15° provided the most effective reduction in pressures and deformations, while increasing anchor length from 0.6<i>H</i> to 0.9<i>H</i> offered only marginal additional reductions. When the structure is placed closer to the diaphragm wall at <i>x</i> = 0.1<i>H</i>, the higher lateral pressures necessitate the use of more than a single-row anchor to maintain stability. In contrast, at <i>x</i> = 0.4<i>H</i>, where the influence of loading on the wall is reduced, even a single-row anchor or no anchor may be sufficient, as the lateral pressures decrease by up to 41%, thereby enhancing wall stability. Overall, using double-row anchors with an anchor length of 0.6<i>H</i> effectively controls deformations within acceptable limits, while ensuring cost-effectiveness, and offers practical insights for designing safer and more efficient deep excavation support systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Staged Excavation Response of Diaphragm Wall Reinforced with Single and Double-Layered Helical Anchors in Sand Backfill

  • 期刊论文

  • 发表日期：

    2026年2月20日

查看全文
  • Ragini Vishwakarma,
  • Satyendra Mittal,
  • Vishwas A. Sawant

摘要

With increasing urbanization and limited ground space, deep excavations are crucial for constructing underground structures. Diaphragm walls are widely used to resist lateral earth pressures and maintain excavation stability. To enhance their performance, helical anchors are commonly installed to control lateral displacement and settlement during excavation and service life. This study presents a series of scaled model experiments investigating the behavior of unanchored, single-row anchored, and double-row anchored diaphragm walls subjected to surcharge loading applied at different normalized horizontal offsets from the excavation face (x/H = 0.1, 0.2, 0.3, and 0.4), where x/H represents the ratio of the horizontal distance between the surcharge location and the diaphragm wall to the wall height. The tests also investigate the effects of anchor inclinations ranging from 5° to 20° with respect to the horizontal, as well as two anchor lengths (0.6H and 0.9H). Results demonstrate that a double-row anchored wall significantly reduces lateral pressure, wall deflection, and footing settlement compared to a single-row and unanchored wall. An anchor inclination of 15° provided the most effective reduction in pressures and deformations, while increasing anchor length from 0.6H to 0.9H offered only marginal additional reductions. When the structure is placed closer to the diaphragm wall at x = 0.1H, the higher lateral pressures necessitate the use of more than a single-row anchor to maintain stability. In contrast, at x = 0.4H, where the influence of loading on the wall is reduced, even a single-row anchor or no anchor may be sufficient, as the lateral pressures decrease by up to 41%, thereby enhancing wall stability. Overall, using double-row anchors with an anchor length of 0.6H effectively controls deformations within acceptable limits, while ensuring cost-effectiveness, and offers practical insights for designing safer and more efficient deep excavation support systems.