Construction methods, technique projects, and practice caese are introduced that applied in shaft and lane excavation in soft muddy clay rock in Dongxiang Copper Mine .

The microtextures feature, material composition, and in-situ consistence characters are researched in the present paper for the residual cohesive soil of clayey rocks, the consistence differences between the in-situ and laboratory results are analyzed as the same.

As an in-situ test means, the borehole elastic modulus tests are often unsuccessful due to unsufficient testing pressure applied to deep soft rock In the engineering investigation of soft rock at Qianjiang No 4 bridge in Hangzhou city, satisfactory results have been obtained by using the 4149 type borehole pressuremeter manufactured by OYO Corporation, Japa

312 highway and through synthetic analysis of the mechanical properties of the soft rock of that district, it is considered that the pile foundation on soft rock is of friction-end bearing pile type.

A synthetic analysis of the mechanical characteristics of the soft rock of that district is carried out,and the design of pile foundation in soft rock is studied.

On construction technology of concrete pipe under soft clay geological conditions;