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Abstract In order to guide the construction of the foundation pit composed of soil and rock effectively，the related monitoring techniques were deeply studied. The failure mode of pit composed of soil and rock was qualitatively analyzed. Based on an under-construction foundation pit composed of soil and rock in the mileage section DK799+450–DK800+750 in Pearl River Delta Area，a typical cross-section was computed with three-dimensional finite element method and monitoring. After synthesis analysis of monitoring results and calculation results，it was pointed out that，based on the existed code，it should mainly monitor deformations and internal forces of guard piles and axial forces of inner bracing for foundation pit composed of soil and rock，especially for the foundation pit whose in-situ stratified rock was a little influenced by groundwater. In addition，the surrounding environment of foundation pit should be also paid some attentions according to the engineering condition.
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Received: 19 October 2012
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2014, Vol. 33 
