Study on Dynamic Mechanical Properties of Limestone under …

Dynamic compressive properties and failure modes of limestone under different impact pressure are investigated. In addition, energy dissipation is studied in the process of …

WhatsApp: +86 18221755073

Modification and Application of Limestone HJC Constitutive …

Limestone is the main rock used for geotechnical engineering for its quality in the southwest of China. The study of the dynamic characteristics of limestone under impact loads is highly important for high-speed impact and accurate rock breaking as well as geotechnical engineering disaster prevention and mitigation. ... the triaxial compression ...

WhatsApp: +86 18221755073

Experimental Investigation of the Static and Dynamic …

These above investigations have provided insights into the compression static and dynamic characteristics of limestone with different initial levels of damage. Hence, in this paper a series of compression tests were conducted on block type limestone by employing a large-scale rock multi-function shear device subjected to 2 110 4 s strain rates ...

WhatsApp: +86 18221755073

Study on Dynamic Mechanical Properties of Limestone …

Dynamic compressive properties and failure modes of limestone under diferent impact pressure are investigated. In addition, energy dissipation is studied in the process of experiment. The …

WhatsApp: +86 18221755073

Dynamic compressive characteristics and damage …

The main chemical composition of the reef limestone from the South China Sea area was determined to be CaCO 3 by measuring using a Zetium fluorescence spectrometer, ... (INSTRON–1346) was used to conduct uniaxial compression tests on reef limestone. The technological parameters of the machine included vertical load of 2000 kN, horizontal load ...

WhatsApp: +86 18221755073

Static and dynamic compressive performance of coral reef limestone …

Mechanical performance of coral reef limestone (CRL) is becoming an important topic in recent years due to the boom in offshore construction. ... limestone, were obtained from a human-made coral reef island in South China Sea. Static uniaxial and dynamic split Hopkinson pressure bar (SHPB) compression tests are conducted to obtain the strengths ...

WhatsApp: +86 18221755073

Experimental Study on Damage Behavior of Porous Coral Limestone …

The mechanical properties and damage behavior of coral limestone collected from the Zhongsha Islands, South China Sea were investigated based on the results of uniaxial compression tests.

WhatsApp: +86 18221755073

Investigation of damage characteristics of coral reef limestone …

The variation of the biological source and diagenetic environment results in significant differences in pore structure and mechanical properties of coral reef limestone (CRL) with various structures. This study analyzed uniaxial compression behavior and pore structural characteristics of four types of CRL using the uniaxial compression test and computerized …

WhatsApp: +86 18221755073

Mechanical characteristics of single cracked limestone in compression

The MTS815 rock mechanics test system was used to perform conventional triaxial compression tests on single cracked limestone specimens under different confining pressures and water pressures. The theory of linear elastic fracture mechanics is used, the fracture mode of single-cracked limestone is analyzed and the rock compression-shear ...

WhatsApp: +86 18221755073

Strain field investigation of limestone specimen under …

Using the colorful video images and experimental data from the laboratory uniaxial compression test of a limestone, XU et al [5] obtained the displacement field using a digital image correlation …

WhatsApp: +86 18221755073

Experimental investigation on the damage characteristics of …

Experimental investigation on the damage characteristics of freeze-thaw limestone by the uniaxial compression and acoustic emission monitoring tests: SONG Yanqi1,2,MA Hongfa2,LIU …

WhatsApp: +86 18221755073

Investigation of damage characteristics of coral reef limestone …

This study analyzed uniaxial compression behavior and pore structural characteristics of four types of CRL using the uniaxial compression test and computerized tomography (CT) scanning test. The influence mechanism of CRL's physical properties on its uniaxial compression characteristics was revealed from a microscopic perspective.

WhatsApp: +86 18221755073

Effects of bedding plane dip angle and lithology on the …

To investigate the mechanical and micro-failure behavior of stratified rock, a series of uniaxial compression and CT scanning tests of stratified limestone and sandstone at different bedding plane ...

WhatsApp: +86 18221755073

4. Fractal Characteristics of Limestone Fragments

Under both the uniaxial stress state and the confining pressure of 10 MPa, the number of limestone specimen fragments generated in the cyclic loading test is greater than that generated in the conventional compression test; and the mass fraction of the fragments in the former test is obviously greater than that in the latter test when the ...

WhatsApp: +86 18221755073

Inﬂuence of Water Saturation Time on Microstructure …

Inﬂuence of Water Saturation Time on Microstructure and Mechanical Properties of Jointed Limestone Huigui Li1*, Jun Wang1,2*, Xiaohe Wang2, Wanliang Liang2, Guosheng Xu1 and Yingchun Kang3 1College of Mining Engineering, Guizhou University of Engineering Science, Bijie, China, 2School of Energy and Mining, China University of Mining and Technology, …

WhatsApp: +86 18221755073

Effect of hydro-chemical corrosion on mechanical properties …

The THMC multifield coupling triaxial compression test equipment was used to conduct the compression tests, as shown in Fig. 2 a. The measuring system consisted of a pair of LVDTs (linear variable displacement sensors) used to measure the axial displacement and a chain radial extensometer used to measure the radial displacement ( Fig. 2 b).

WhatsApp: +86 18221755073

Tests on dynamic properties of coral-reef limestone in South China …

Biogenic coral-reef limestone is distinct from the traditional geological rock. In this study, Hopkinson pressure bar tests on coral-reef limestone are conducted to investigate the dynamic ...

WhatsApp: +86 18221755073

Graph theoretical analysis of limestone fracture network …

We focus primarily on the evolution of node types, topological attributes, and motifs of the fracture network in limestone under uniaxial stress. Observations expose the varying behavior of the …

WhatsApp: +86 18221755073

Experimental Study on Uniaxial Compression Failure …

1. Introduction. Currently, in China's coal mines, coal resources above the confined aquifer with Ordovician limestone are generally exploited with some traditional methods, mainly including remaining waterproof coal pillars, stripe mining, limited-thickness extraction, and hydrophobic depressurization, causing serious waste of coal and mine water resources [1 – 3].

WhatsApp: +86 18221755073

Effects of bedding plane dip angle and lithology on the

To investigate the mechanical and micro-failure behavior of stratified rock, a series of uniaxial compression and CT scanning tests of stratified limestone and sandstone at different bedding plane dip angles (α) were conducted. The experimental results showed that with the increasing α, uniaxial compressive strength (UCS), peak strain (ε1p), Poisson's ratio (μ) of …

WhatsApp: +86 18221755073

Experimental Study on Damage Behavior of Porous Coral Limestone …

The damage characteristics of coral limestone are of great significance for guiding the design and construction of offshore engineering such as submarine tunnels and pipelines. The mechanical properties and damage behavior of coral limestone collected from the Zhongsha Islands, South China Sea were investigated based on the results of uniaxial compression tests. …

WhatsApp: +86 18221755073

Static and dynamic compressive performance of coral …

coral gravel (CG), and coral calcarenite (CC) limestone, were obtained from a human-made coral reef island in South China Sea. Static uniaxial and dynamic split Hopkinson pressure bar (SHPB) compression tests are conducted to obtain the strengths at very low and medium to high compressive strain rates, respectively.

WhatsApp: +86 18221755073

Energy analysis of limestone during triaxial compression …

Tests on dynamic properties of coral-reef limestone in South China Sea [J]. Rock and Soil Mechanics, 2019, 40(1): 183-190. [10] PENG Shou-jian, WANG Zhe, XU Jiang, OKUBO Seisuke, TANG Yang, . Experimental study on loading rate effect in post-failure region of water-saturated rock under triaxial compression [J]. Rock and Soil Mechanics, 2018, 39 ...

WhatsApp: +86 18221755073

Static and dynamic compressive performance of coral reef limestone …

Static uniaxial and dynamic split Hopkinson pressure bar (SHPB) compression tests are conducted to obtain the strengths at very low and medium to high compressive strain rates, respectively.

WhatsApp: +86 18221755073

Dynamic compressive properties and self-similarity …

In this paper, the Split Hopkinson Pressure Bar tests were carried out on the specimens of deep coral reef limestone in the South China Sea, and the difference of dynamic response between deep reef limestone and shallow calcified coral skeleton was revealed. ... and the dynamic uniaxial compression test becomes an undrained condition test, so ...

WhatsApp: +86 18221755073

Test and Models of the Mechanical Properties of Limestone …

With the Permian limestone in Chongqing Wulong area as research object, the relations among yield strength, rock peak intensity, residual strength and confining pressure were studied through triaxial test.

WhatsApp: +86 18221755073

Crack Initiation and Damage Evolution of Micritized Framework Reef

Triaxial compression tests are conducted for the micritized framework reef limestone, which is sampled from a reef island in the South China Sea. The lateral strain response method (LSR) is applied to figure out the crack initiation stress of the reef limestone sample under different confining pressures. With a low porosity and a high dry density, the micritized …

WhatsApp: +86 18221755073

Characteristic Point of the Relatively Quiet Period for Limestone

Abstract. In view of the precursory characteristic point of limestone failure under uniaxial compression, the underlying mechanisms are not sufficiently clear. Experimental studies examining the acoustic emission (AE) characteristics of the complete limestone failure process have been carried out under uniaxial compression. The experimental results, including …

WhatsApp: +86 18221755073

China Limestone Compression Test

Triaxial Compression Test Characteristics of Limestone from … A total of four sets of multistage triaxial compression test were conducted on limestone sample over the range of confining pressure of 1–15 MPa. From the Mohr–Coulomb failure envelope, the range of friction angle ϕ of limestone was 46°–54.2° with mean of 49.6°.

WhatsApp: +86 18221755073

Failure properties of rocks in true triaxial unloading compressive test

Trans. Nonferrous Met. Soc. China 25(2015) 571âˆ'581 Failure properties of rocks in true triaxial unloading compressive test Kun DU 1, Xi-bing LI 2, Di-yuan LI 2, Lei WENG 2 1. ... the standard uniaxial compression test was carried out on two rocks and the uniaxial compressive strengths of granite and red sandstone are 139.0 MPa and 57. ...

WhatsApp: +86 18221755073

Classification and Fractal Characteristics of …

The results show that limestone specimens subjected to cyclic loading can generate more small-sized fragments than conventional compression, but the large-fragment-producing abilities of the two ...

WhatsApp: +86 18221755073

Investigation of damage characteristics of coral reef limestone …

Request PDF | On Dec 24, 2022, Kai Wu and others published Investigation of damage characteristics of coral reef limestone under uniaxial compression based on pore structure | Find, read and cite ...

WhatsApp: +86 18221755073

Experimental investigation on the macro-mechanical …

In present work, to investigate the mechanical behavior and deformation characteristics of bedrock in Momoke water conservancy project, located in Xinjiang, China, uniaxial and triaxial compression tests of Xiyu conglomerate under various confining pressures are conducted by the rock automatic triaxial test system with permeability measurements.

WhatsApp: +86 18221755073

Strain field investigation of limestone specimen under …

Zhejiang Jingyuan Machinery Company Limited, China. The external stress data on the plate were acquired using the SmartTest Computer-controlled System. Table 1 presents the results of uniaxial compression tests for the limestone specimen. Table 1 Results of uniaxial compression tests for limestone specimen Specimen number L/ mm W/ mm H/ mm P ...

WhatsApp: +86 18221755073

Fatigue Characteristics of Limestone under Triaxial Compression …

Deviatoric stress-strain curves from the triaxial compression tests of the limestone samples with a single loading rate (0.003 mm/s). 3.2. Cyclic Loading Tests ... This research was supported by the National Natural Science Foundation of China (Grant nos. 51379116 and 51574156), Tai'shan Scholar Talent Team Support Plan for Advantaged and ...

WhatsApp: +86 18221755073

Static and dynamic compressive performance of coral …

SHPB compression tests are also conducted to study the strengths at medium to high strain rates of 10 1 ~ 10 2 s −1 . The strengths at intermediate strain rates (10 − 3 ~ 10 1 s −1 )

WhatsApp: +86 18221755073

Strength Characteristics of Reef Limestone for Different Cementation

The mechanical properties and damage behavior of coral limestone collected from the Zhongsha Islands, South China Sea were investigated based on the results of uniaxial compression tests.

WhatsApp: +86 18221755073

Mechanical Properties and Acoustic Emission Characteristics …

1. Introduction. China has the most widely distributed karst area in the world. The distribution area of soluble rock in China is mainly located in the southwest, total area is about 3,400,000 km 2 (Figure 1), among which the exposed carbonate area reaches 910,000 km 2 [1, 2].The development of Western China is an important strategy for China's economic …

WhatsApp: +86 18221755073

المنتجات