Numerical analysis of settlement of composite foundation and natural foundation under earthquake action;

Study on feasibility of intensively weathered diorite serving as natural foundation;

The field inspection and incipient fault treatment of natural foundation

The settlement characteristics of the underlying soil layer of composite ground are studied systematically; through comparison of the settlements , by proper numerical modeling tests for composite ground, two-layered soil, artificial ground and natural ground with different improvement parameters, such as replacement ratio and elastic modulus ratio between pile and soil.

From the aspects of bearing capacity,averaged settlement and integral decline,analyzing a building of 32 layers based on residual soil of granite,proving the feasibility of natural ground.

According to the importance of the inspection of foundation subsoil,the author describes the some items requiring attention of the pre and post-inspection of foundation subsoil,discusses the emphasis of the examining trough in the foundation engineering,concludes and summarizes the measures of the examining trough,to ensure the quality of the construction engineering and avoid the accident.