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Engineering Geology

Engineering Geology - geomuseu

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Chapter 7<br />

Figure 7.18<br />

(a) Schematic diagram of self-boring pressuremeter. This pressuremeter is available in three diameters (65, 100 and 132 mm).<br />

The injection fluid flow that can be applied is limited by the section of flexible pipe (A). Consequently, this pressuremeter can<br />

be used only in fine sands or soft cohesive soils. (b) The Camkometer breaks up the soil with a chopping tool rotated by a drill<br />

string driven from the surface. The chopping tool (1) is driven by a hollow middle rod (2) through which water is driven under<br />

pressure. This rod turns freely within a tube (3) used for removing sediment to the surface. There also is a tube (4) that carries<br />

the pressiometric cell (5) that may be equipped with a pore pressure tap (6). The pressiometeric cell supply and measurement<br />

lines (7) run through the annulus between the two tubes. (c) Self-boring pressuremeter probe with built in motor.<br />

Figure 7.19<br />

A dilatometer.<br />

343

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