ABSTRACT:

This paper has dealt with the flexural failure of multilayer rockmass in slopes, and proposed a theoretical method for the quantitative evaluation of this kind of failure. In the application of the theoretical result to the analysis of a practical engineering example, the method is verified useful not only in solving engineering problems but also in deepening the recognition of the mechanism of flexural failure of multilayer rockmass.

RÉSUMÉ:

Le papie lei dlseute de la destruction flexible dans des rocheux substratum superpose et propose une methode determinant les destruction flexible quantitativement. Ouelque application de le result theorique dans une pente genic onl bien prouve que cette methode est utile non seulement, à la solution des ge- nie problèmes mais encore à la connaissance de la destruction flexible.

ZUSAMMENFASSUNG:

In diesem Artikel wurde der gebogene Bruch von den Mehrschichtenfelsen in Böschung diskutiert und die Methode der quantitativen Bewertung fuer diesen Bruch auf gestellt, Durch ein praktisches Ingenicurbeispiel wurde es nachgewiesen, dass diese Methode nicht nur bestimmt Ingenieur-probleme losen, sondern auch den Mechanismus des gebogenen Bruches von den Mehrschichtenfelsen tief erkennen kann.

1
FAILURE PATTERNS OF ROCKMASS DIPPING ALONG SLOPEAND ITS MECHANISM

For bedded rockmass dipping along slope, its possible occurrence is in the following two kinds of forms:

  • a. the bedding planes occurring in the surface of slope, that is the dipping angle β of the bedded rockmass is smaller than slope α (Fig. 1a);

  • b. the bedding planes not occurring in the surface of slope, that macans the dipping angle β of the bedded rockmass is bigger than slope α (Fig. 1 b)

(Figure in full paper)

In engineering construction, generally speaking, the former kind of slope draws much more attention due to the existing of space for the sliding of the rockmass along bedding panes. But for the second kind of slope, its stability is generally believed out of question. In fact, the Failure phenomena of rockmass can also often be found in the second kind of slope. This paper will give a description of the mechanism on the rockmass failure in the second kind of slope quantitatively.

According to the observations in engineering practices, for the second kind of slope, its failure pattern and process is as Flg.2. shows. At first, the cohesion between bedding planes of bedded rockmass near slope will he reduced due to weathering and the action of runoff, consequently the upper rockmass will be liable to slide down, which results in a sliding force on the lower part of rockmass; secondly, the penetration of runoff into rockmass will result in a hydrostatic pressure. Under the combined action of the sliding force and the hydrostatic pressure, the lower part of rockmass can be flexed. The more and more reduction or the cohesion between bedding planes, the more and more increase of the sliding force, and the more and more reduction of the strength of rockmass with time due to weathering.

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