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夯坑基础的基础本体主要有两类:一类是平底方截锥形浅基础,一类足锥形长基础。两类基础上部都可以设杯口或不设杯口。我们研究三类情况:带杯口的方截锥形浅基础;不带杯口的锥形长基础;带杯口的锥形长基础。一、带杯口的方截锥形浅基础杯形基础在荷载作用下的破坏,一般会产生两种情况:第一种破坏是基础下部在土反力产生的剪力作用下产生冲切破坏。这种破坏大约从柱下端起,与竖向成45°角方向发生,破坏面为锥形斜截面(见图29)。这是因混凝土斜截面上的主拉应力超
There are two basic types of foundations for sag foundations: one is a flat-bottomed truncated-cone shallow foundation, and the other is a type of foot-cone-long foundation. The upper part of both types of foundation can be provided with or without a cup. We studied three types of situations: square truncated conical-shaped shallow bases with cups, tapered long bases without cups, and tapered long bases with cups. 1. The failure of a square frusto-cone-shaped shallow foundation cup-shaped foundation with a cup mouth under load generally results in two situations: The first type of failure is the undercutting of the lower part of the foundation under the action of shear forces generated by the soil reaction forces. . The damage occurred approximately from the lower end of the column and it occurred at an angle of 45° to the vertical direction. The failure surface was a tapered oblique section (see Figure 29). This is due to the main tensile stress on the oblique section of concrete.