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Fu Huang,Yongtao Wang,Jingshu Xu,Qiujing Pan,Di Wang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12
In accordance with the collapse characteristic of trench wall during underground diaphragm wall construction, a modified three-dimensional (3D) failure mechanism of trench wall is established. By introducing nonlinear characteristic and the nonhomogeneity of soil into the theoretical calculation, the objective function of the safety factor (Fs) of the trench wall in the limit condition is derived, and the upper bound solution of the Fs of the slurry trench is derived by employing the optimization computation. To prove the validity of the presented approach, the solutions derived from the presented method are compared with those previous solutions and the comparing results show a good agreement. Moreover, the parametric analysis is conducted to study the effect of various parameters on the stability of trench wall. The results of parametric analysis show that nonlinear and the nonhomogeneous parameters have significant influence on the safety factors, and the nonlinear failure characteristic of the nonhomogeneity of soil cannot be ignored in the practical engineering.
Fu Huang,Ziqin Wang,Min Zhang,Siyuan Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.2
Planned tunnel excavation beneath piled buildings is common in actual projects. The excavation-induced deformation of the bearing stratum at the end of an existing pile end may decrease the ultimate bearing capacity of the pile, affecting its mechanical properties. Since previous studies on this topic have focused on the pile deformation induced by tunneling, the deformation mode of the bearing stratum at a pile end has not been thoroughly investigated. In this study, a new two-dimensional failure mechanism describing the failure characteristics of a bearing stratum at the end of an existing single pile induced by shield tunnel drilling beneath the pile is established. Based on this mechanism and the kinematic approach, an analytical equation for the failure surface of the bearing stratum during tunnel drilling beneath a single pile is obtained via a variational principle, and the shapes of the rupture surface of the bearing stratum at the pile end are plotted for various parameters. To validate the validity of the method in practice, an analytical expression for the failure surface of the bearing stratum is obtained and compared with numerical simulation solutions. The results of this comparison show that the presented method is effective for studying the failure characteristics of a bearing stratum at a pile end and can be used for predicting these failure characteristics in practice.
Fu-Ting Huang,Kai-Cheng Lin,Chih-Yang Lin,Wei-Ning Chang 대한정형외과학회 2021 Clinics in Orthopedic Surgery Vol.13 No.3
Background: Coracoacromial ligament transfer is the traditional procedure for treating chronic acromioclavicular separation, but it is significantly inferior to ligament reconstruction according to biomechanical and clinical studies. However, ligament reconstruction carries the risk of complications of graft loosening and peri-tunnel fractures. Currently, there is no ligament reconstruction procedure optimal for preventing such complications. The purpose of this study was to describe and retrospectively analyze the clinical and radiological outcomes of a “duo-figure-8” autogenic graft wrapping technique, which was used to concomitantly reconstruct the acromioclavicular and coracoclavicular ligaments. Methods: Preoperative, immediate postoperative, and final follow-up oputcomes were evaluated in 10 enrolled patients. Radiographic outcomes were indicated by the bilateral difference of the coracoclavicular distance (CCD) and overlapping length of the acromioclavicular joint (OLac). Quality of reduction was classified into 4 grades according to bilateral CCD difference into overreduction (< 0 mm), anatomic reduction (0–4 mm), partial loss of reduction (4–8 mm), and recurrent dislocation (> 8 mm). Clinical outcomes were evaluated using the American Shoulder and Elbow Surgeons (ASES) and Constant scores. Results: The mean side-to-side differences for CCD were 11.9 mm (preoperative), −0.1 mm (immediate postoperative), and 3.4 mm (final follow-up); those for OLac were 9.4 mm (preoperative) and 2.7 mm (final follow-up). CCD and OLac outcomes significantly improved at final follow-up (p < 0.05). At the immediate postoperative stage, 6 and 4 patients had overreduction and anatomic reduction, respectively. At final follow-up, 7 and 3 patients had anatomic reduction and partial loss of reduction, respectively. The magnitude of improvement of ASES scores for patients with anatomic reduction and partial loss of reduction (p = 0.20) was 18.1 and 20.0, respectively. The magnitude of improvement of Constant scores in patients with anatomic reduction and partial loss of reduction (p = 0.25) was 19.9 and 22.3, respectively. Conclusions: The technique yielded acceptable functional outcomes in patients with anatomic reduction or partial loss of reduction. The “duo-figure-8” wrapping method—a single autogenic tendon graft passing beneath the coracoid process with a tendonknot fixation over the distal clavicle and looping around the acromion intramedullary—did not increase the risk of peri-tunnel fractures over the clavicle, coracoid process, or acromion.
Effect of surface bolt on the collapse mechanism of a shallow rectangular cavity
Huang, Fu,Zhao, Lian-heng,Zhang, Sheng Techno-Press 2017 Geomechanics & engineering Vol.13 No.3
Based on the collapse characteristics of a shallow rectangular cavity, a three-dimensional failure mechanism which can be used to study the collapsing region of the rock mass above a shallow cavity roof is constructed. Considering the effects of surcharge pressure and surface bolt on the collapsing block, the external rate of works produced by surcharge pressure and surface bolt are included in the energy dissipation calculation. Using variational approach, an analytic expression of surface equation for the collapsing block, which can be used to study the collapsing region of the rock mass above a shallow cavity roof, is derived in the framework of upper bound theorem. Based on the analytic expression of surface equation, the shape of the collapsing block for shallow cavity is drawn. Moreover, the changing law of the collapsing region for different parameters indicates that the collapsing region of rock mass decreases with the increase of the density of surface bolt. This conclusion can provide reference for practicing geotechnical engineers to achieve an optimal design of supporting structure for a shallow cavity.
Amylosporus sulcatus sp. nov. (Russulales, Basidiomycota) from Southern China
( Fu-chang Huang ),( Bin Liu ),( Hao Wu ),( Pei-sheng Qin ),( Jin-feng Li ) 한국균학회 2018 Mycobiology Vol.46 No.4
Amylosporus sulcatus sp. nov. is described from Nonggang Nature Reserve, southern China, on the basis of morphological and molecular data. The morphological description and illustrations for the new species are provided. The species is characterized by pileate and stipitate basidiocarps. The pileus surface is obviously concentrically and radiately sulcate and tomentum, and the pore surface is snow white. Phylogenetic analyses based on sequences of the internal transcribed spacer and nuclear large subunit ribosomal DNA confirmed it to be a new species.
Huang, Fu,Cho, Byungjin,Chung, Hee-Suk,Son, Seung Bae,Kim, Jung Han,Bae, Tae-Sung,Yun, Hyung Joong,Sohn, Jung Inn,Oh, Kyu Hwan,Hahm, Myung Gwan,Park, Jung Hee,Hong, Woong-Ki The Royal Society of Chemistry 2016 Nanoscale Vol.8 No.40
<P>We demonstrate the charge transport characteristics of MoS2-based vertical heterojunction devices through the formation of interfacial strain. Atomically thin MoS2 bilayers were directly synthesized on a p-type Si substrate by using chemical vapor deposition to introduce an interfacial tensile strain in the vertical heterojunction diode structure, which was confirmed by Raman, X-ray and ultraviolet photoelectron spectroscopy techniques. The electrical and optoelectronic properties of the heterojunction devices with the as-grown MoS2 (A-MoS2) on p-Si were compared with those of transferred MoS2 (T-MoS2)/p-Si devices. To clearly understand the charge transport characteristics induced by the interfacial tensile strain, the Fowler-Nordheim (FN) analysis of the electrical properties of the diode devices was conducted with the corresponding energy band diagrams. All of the fabricated MoS2-based vertical diodes exhibited clearly rectifying behaviors, but the photoresponse properties of the A-MoS2-based and T-MoS2-based heterojunctions exhibited distinct differences. Interestingly, we found that the tunneling barrier heights of the A-MoS2-based heterojunction devices were relatively higher than those of the T-MoS2-based devices and were almost the same before and after illumination due to the interfacial tensile strain, whereas those of the T-MoS2-based devices were lowered after illumination. Our study will help further understand the charge transport properties of 2D material-based heterojunction devices in the presence of interfacial strain, ultimately enabling the design of electronic and optoelectronic devices with novel functionalities.</P>