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Article
Application of caustic method to determining stress intensity factor of compressive shear crack
The caustic method is applied to compressive shear experiment and used to detect the stress intensity factors of cracks prefabricated on plexiglass sample. Loading, friction of crack planes and influence among...
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Article
Study on simulating strong ground motion by fractal stochastic method
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Article
Load-Unload Response Ratio (LURR), Accelerating Moment/Energy Release (AM/ER) and State Vector Saltation as Precursors to Failure of Rock Specimens
— In order to verify some precursors such as LURR (Load/Unload Response Ratio) and AER (Accelerating Energy Release) before large earthquakes or macro-fracture in heterogeneous brittle media, four acoustic em...
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Article
A new method for testing pile by single-impact energy and P-S curve
By studying the pile-formula and stress-wave methods (e.g., CASE method), the authors propose a new method for testing piles using the single-impact energy and P-S curves. The vibration and wave figures are recor...
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Article
A new method of testing pile using dynamic P-S-curve made by amplitude of wave train
A new method of detecting the vertical bearing capacity for single-pile with high strain is discussed in this paper. A heavy hammer or a small type of rocket is used to strike the pile top and the detectors ar...
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Article
Experimental research on critical point hypothesis
According to the critical point hypothesis (CPH), energy release would accelerate in power law before occurrence of large earthquakes or failure of brittle materials. In the paper, CPH was studied by acoustic ...
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Chapter
Load-Unload Response Ratio (Lurr), Accelerating Moment/Energy Release (Am/Er) and State Vector Saltation As Precursors To Failure of Rock Specimens
In order to verify some precursors such as LURR (Load/Unload Response Ratio) and AER (Accelerating Energy Release) before large earthquakes or macro-fracture in heterogeneous brittle media, four acoustic emiss...
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Article
A study on relation between acoustic emission and characteristic displacement field on the sample with multi en echelon structures — The theoretic and experimental explorations of strain gap
Based on the phenomena that the deformation gap was observed before the great Tangshang earthquake, this paper discusses the strain gap according to test and theory. The (strain) patterns were recorded photogr...
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Article
An experimental study of the dynamic features of shadow areas of caustics in response to loading/unloading fracture
Using a plexiglass sample and by means of real-time holographic interferometry and shadow optical method of caustics, the different features of dynamic variation in stress (strain) field, plastic area and nucl...
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Article
Physical meaning and prediction efficiency of the load/unload response ratio of rocks in strain-weakening phase before failure
Rock experiment results indicate that the load/unload response ratio (LURR) of rocks expressed via strain energy may have singular or negative value after the stress in the rock reaches its maximum before rock...
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Article
Burst strain disturbance — A new test study on fracture precursor
A multi-functional high-frequency seismometer, a new instrumental system, is used for recording multi-point strain variations of rock samples in the process of fracture development. The results indicate that s...
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Article
Experimental studies on the evolution process of microcrack patterns in concrete samples containing hard inclusions
Under biaxial pressure, the microcrack patterns of concrete samples with hard inclusion are as followings: Microcracks generate around the sample at the early pressured period, and gap is formed in the middle ...
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Article
An experimental study on fractural features of concrete samples containing hard inclusion
The final fractural forms and variation status of hard inclusion samples under biaxial compression have been primarily studied in this paper. The lateral fractural forms of samples are mainly compressive-shear...
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Article
TheQ value variations in the preparing process of rock rupture
In this paper, the "spectral amplitude ratio method" (SAR), "energy method" (EN) and "coda wave method" (CW) are used to calculate theQ value variations of gneiss in the preparing rupture process. The obtained re...
