retainingwalls(參考版)
2024-07-28 16:55本頁面
【正文】 3) Placement of a perforated drain pipe longitudinally along the back of the wall: surrounded by filter material and water drains through the filter material into the pipe and then through the pipe to one end of the wall. 8 Sunday, August 14, 2022 Retaining Walls 4) In both cases (weep holes and drain pipes) a filter material must be placed adjacent to the pipe to prevent clogging, and the pipes must be kept clear of debris. 5) Placement of a wedge of pervious material adjacent to the wall or a a “drainage blanket” of pervious material If a less pervious material (silt, granular soil containing clay, etc.) has to be used as backfill. 6) A highly impervious soil (clay) is very undesirable because, in addition to the excessive lateral earth pressure, it also is difficult to drain and may be subject to frost action, and swelling and shrinking. V. *Settlement and Tilting 1. Settlement by retaining walls is inevitable, just as by any other structure resting on footings or piles. 9 Sunday, August 14, 2022 Retaining Walls V. Settlement and Tilting 1) Retaining walls on granular soils: Most of the expected settlement will occur by the time the construction of the wall and placement of backfill have been pleted. 2) Retaining walls on cohesive soils: Settlement will occur slowly and for a long period of time after construction has been pleted. 3) Retaining walls on spread footings: The amount of settlement can be determined using the principles of settlement anal
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