population of 270,000. It is currently the six national brand carriers, namely the
national university science and technology park, the national high-tech innovation
service center, China’s entrepreneur park for overseas Chinese scholars, the
national optoelectronics and communication component industry base, China’s
export processing zone, and the national riverside green chemical industry base, and
becomes the world’s largest single plant high-end artpaper production base, China’s
largest engineering plastics particle base, China’s largest automobile engine
cylinder production base and China’s largest adjustable-blade propeller production
base.
(3) Overview of geological environment
① Stratigraphic lithology
The Cenozoic Erathem Quaternary Holocene fill layer (Q 4
ml
), proluvial and alluvial
(Q 4
pl+al ) layer and Proterozoic Sinian layer (Z 2dn and Z 2d2 ) are distributed in the
study area, which are described as follows from new to old:
I. Quaternary
The fill layer (Q 4
ml ) is mainly distributed in the shallow layer of the study area,
which, with disorderly soil texture, is dominated by silty clay mixed with gravels,
featuring loose structure and uneven texture. It is about 0.50–1.50 m thick.
The proluvial and alluvial (Q 4
pl+al ) layers are chiefly distributed below the surface
layer, dominated by silty clay, being yellowish brown, hard and partially plastic. It
is slightly lustrous, having medium dry strength and medium toughness. It is 0.00–
20 m thick.
II. Sinian
The Dengying Formation (Z 2dn ) is the major outcropping stratum in the study area,
dominated by the grayish white and dark gray medium-thick dololaminite, which is
exposed extensively by quarry excavation in the study area. The minerals are
mainly composed of the dolomite and a small amount of calcspar, with crystallinegranular texture. The rock mass has a basic quality grade of IV, with relatively developed vertical joints and high stability. The saturation density
q = 2.74 g/cm
3 and the saturated uniaxial compressive strength fr = 53.84 MPa.
The marbleization in the local rock mass is obvious under the influence of
epimetamorphism.
Doushantou Formation (Z2d2) is the dark gray medium-thick layered intraclast
containing dolomitic limestone and limestone, primarily composed of calcspar and
a small amount of dolomite, with crystallinegranular texture. The rock mass has a
basic quality grade of III, with relatively developed vertical joints and high stability.
② Geological structure
The study area is located in the second giant paleo-uplift of the Neocathaysian
tectonic system and the Huaiyang epsilon-type east wing reflex arc zone, in the
northeastern section of Nanjing depression basin of Yangtze folded belt of Yangtze
5.6 East China
349
national university science and technology park, the national high-tech innovation
service center, China’s entrepreneur park for overseas Chinese scholars, the
national optoelectronics and communication component industry base, China’s
export processing zone, and the national riverside green chemical industry base, and
becomes the world’s largest single plant high-end artpaper production base, China’s
largest engineering plastics particle base, China’s largest automobile engine
cylinder production base and China’s largest adjustable-blade propeller production
base.
(3) Overview of geological environment
① Stratigraphic lithology
The Cenozoic Erathem Quaternary Holocene fill layer (Q 4
ml
), proluvial and alluvial
(Q 4
pl+al ) layer and Proterozoic Sinian layer (Z 2dn and Z 2d2 ) are distributed in the
study area, which are described as follows from new to old:
I. Quaternary
The fill layer (Q 4
ml ) is mainly distributed in the shallow layer of the study area,
which, with disorderly soil texture, is dominated by silty clay mixed with gravels,
featuring loose structure and uneven texture. It is about 0.50–1.50 m thick.
The proluvial and alluvial (Q 4
pl+al ) layers are chiefly distributed below the surface
layer, dominated by silty clay, being yellowish brown, hard and partially plastic. It
is slightly lustrous, having medium dry strength and medium toughness. It is 0.00–
20 m thick.
II. Sinian
The Dengying Formation (Z 2dn ) is the major outcropping stratum in the study area,
dominated by the grayish white and dark gray medium-thick dololaminite, which is
exposed extensively by quarry excavation in the study area. The minerals are
mainly composed of the dolomite and a small amount of calcspar, with crystallinegranular texture. The rock mass has a basic quality grade of IV, with relatively developed vertical joints and high stability. The saturation density
q = 2.74 g/cm
3 and the saturated uniaxial compressive strength fr = 53.84 MPa.
The marbleization in the local rock mass is obvious under the influence of
epimetamorphism.
Doushantou Formation (Z2d2) is the dark gray medium-thick layered intraclast
containing dolomitic limestone and limestone, primarily composed of calcspar and
a small amount of dolomite, with crystallinegranular texture. The rock mass has a
basic quality grade of III, with relatively developed vertical joints and high stability.
② Geological structure
The study area is located in the second giant paleo-uplift of the Neocathaysian
tectonic system and the Huaiyang epsilon-type east wing reflex arc zone, in the
northeastern section of Nanjing depression basin of Yangtze folded belt of Yangtze
5.6 East China
349