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笔者在工作中遇到如图1所示的情况,其中雨水方沟的净空为1.4×1.4m,厚度为200mm;生活下水园管为φ300×35钢筋混凝土管。管道于1971年施工投产,至今已14年。当时地面标高较低,施工方法接近上埋式。目前的地面标高是逐渐填起来的。 地质情况:原土R=30t/m~2,是粘土夹卵石层;填土的物理力学指标是:γ=1.6t/m~3,R=8t/m~2,Es=30kg/cm~2,C=3t/m~3,φ=15°。填土时未经特殊夯实。
The author encountered in the work as shown in Figure 1, the rainwater side ditch clearance is 1.4 × 1.4m, thickness is 200mm; life of the garden pipe is φ300 × 35 reinforced concrete pipe. The pipeline was put into operation in 1971 and has been in operation for 14 years. At the time, the elevation of the ground was low, and the construction method was close to the buried type. The current ground level is gradually filled. Geological conditions: The original soil R=30t/m~2 is a clay-clad layer; the physical and mechanical indexes of the filling are: γ=1.6t/m~3, R=8t/m~2, Es=30kg/cm~ 2, C=3t/m~3, φ=15°. Filling without special tamping.