Abstract
This paper takes the newly built railway passing through the diatom land area of Shengzhou and Xinchang in Zhejiang Province as an example. And based on the field test of soil samples, this paper pointed out that due to low natural density, large void ratio, high water content, dry shrinkage and wet expansion, relative deformation and strength, The diatomite are not suitable to be directly used as building foundation. Based on the static load of single pile, bearing capacity of composite foundation and in-situ vibration test of foundation bed, it proposed that CFG pile, plain concrete pile and reinforced concrete pile are suitable for diatomite foundation reinforcement. While screw pile has insufficient bearing capacity, due to soil compaction effect and poor pile forming effect of high pressure jet grouting pile. CFG and plain concrete pile composite foundation can meet the requirements of diatomite subgrade deformation, and plain concrete pile is much better. The raft structure has better integrity. The capillary waterproof and drainage board can significantly improve the waterproof and drainage effect, and reduce the adverse effect of dynamic load on diatom soil foundation. Based on the slope rainfall test, it is proposed that diatomite natural slope is easy to form network cracks and induce shallow landslide under the action of dry wet cycle. In addition, the effect of gentle slope and skeleton on Diatomite slope is better.
Highlights
Diatomite is a kind of silicate remains of unicellular algae collectively referred to as diatoms, deposit formed by the accumulation period of about 10000 to 20000 years, which is mainly distributed in China, the United States, Denmark, France, Romania and other countries
From the physical and mechanical indexes of field sampling test, the diatomite in Shengzhou area has the characteristics of small dry density, high moisture content, high void ratio, strong structure, easy disintegration, etc., It has the multiple characteristics of clay, soft soil and expansive soil
Based on the new railway project, this paper carried out the field comprehensive test research of diatomite subgrade project in Shengzhou, Zhejiang Province
Summary
Diatomite is a kind of silicate remains of unicellular algae collectively referred to as diatoms, deposit formed by the accumulation period of about 10000 to 20000 years, which is mainly distributed in China, the United States, Denmark, France, Romania and other countries. Ma qiuzhu [7] and others have studied the engineering characteristics of diatomite in Namibia They believe that the serious mismatch between the strength index and compression index of diatomite may lead to great uncertainty in its shear and rheological properties under the action of long-term shear stress, which may lead to large later settlement and deformation. Black diatomite is rich in organic matter, which is the key factor to differentiate its engineering properties and color from white and blue diatomite; the sedimentary environment of diatomite in Zhejiang Province is warm and humid. Due to the obvious differences of diatom origin, diatom species, soil structure and chemical composition in different areas, the diatom properties in some areas may not be universal, so this paper can only be used as a reference
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