Earth Pressure and Settlement Analysis of Trench Ducts Backfilled with Controlled Low Strength Materials

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• 关键词：Controlled low strength materials ; sustainable materials ; trench ducts ; Excavation and Backfill ; Boundary Element Analysis
• 刊名：Procedia Engineering
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：142
• 期：Complete
• 页码：174-181
• 全文大小：844 K

文摘

Recently trench ducts for allocating conveying pipes for various hydraulic or electric lines are tremendously constructed due to rapid growth of life and communication demand. Graded sands and concrete are usually in conventional excavation and backfill operation. Controlled low-strength material (CLSM) has been proposed as a suitable substitute for this construction. However, exact and reliable analysis is required to assure the stress and settlement limitation. This paper presents static analysis of trench duct backfilled with sustainable materials and conventional materials using boundary element (BE) method. The Young's moduli of CLSM are obtained from laboratory tests for two different binder mixtures, CLSM B-130/30% and CLSM B-8-/30%, respectively. Two-dimensional planar strain is employed in the BE formulation of static analysis and comparison study of 4 kinds of backfill materials, i.e., graded sand, CLSM B130-30%, CLSM B130-80%, and concrete. Emphasis is put on the lateral pressure on the side wall, settlement at the top of trench duct, vertical displacement along the centerline of duct and top of pipe cover, induced by three wheel surcharges: concentrated, strip and uniform lane loads. Convergence tests of BEM results are first conducted. Numerical results show that the settlement and lateral pressure of CLSM backfills are acceptable to assure the applicability of CLSM as a suitable sustainable material employed for trench duct design and backfill construction.