[Application of solidification technology in ecological protection of rural riverbank].
A self-developed binder was used for the solidification of construction refuse piles and whole soil matrix, and a technology of this solidification combining with grass-planting was adopted to ecologically protect the rural riverbanks at Tianshan Village of Shanghai. This technology and other ecological engineering techniques were also employed to reconstruct the ecological environment of a sewage pond at the Village. The results showed that the solidified piles had an anti-compression strength of up to 7.3 MPa, with good hydraulic permeability, fast hardening rate, and low drying shrinkage, which met the requirements for ecological safety. The solidified stakes could be used at a low temperature of above -18 degrees C with addition of certain anti-freezing agents. The riverbank underpinned with the solidified stakes had higher anti-compressive strength, higher ability of anti-soil erosion, and better hydraulic permeability; and its soil had the similar moisture content to bare riverbank soil, with no detrimental effects on the root growth of planted grass. After soil solidification, the shearing strength of the riverbank increased by 50 times, and its soil loss was only 5% of the bare riverbank. In the first 10 days after adopting this technology, parts of Cynodon dactylon roots on the surface of solidified soil matrix began to extend into soil; after one month, 60% of the roots penetrated into deeper soil layer; and 11 months later, the grass roots completely grew in-depth in the soil. The combination of our solidification technique with vegetation reconstruction satisfied the requirements of both stabilizing riverbank and improving riparian habitat.
Fu
Rong-bing
RB
Shanghai Academy of Environmental Sciences, Shanghai 200233, China. rongermmfu@163.com
Chen
Xiao-hua
XH
Luo
Qi-shi
QS
Zhang
Shu-jiu
SJ
Li
Xiao-ping
XP
Geng
Chun-nü
CN
D002681:China; D017753:Ecosystem; D004738:Engineering; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006109:Poaceae / Q000254:growth & development*; D045483:Rivers; D012424:Rural Population; D012987:Soil
D012987:Soil